diff --git a/docs/404.html b/docs/404.html index 6a9e9f387a..62ae2dc7ff 100644 --- a/docs/404.html +++ b/docs/404.html @@ -8,13 +8,13 @@ - + -

404

Looks like we've got some broken links.
+ - + diff --git a/docs/about/index.html b/docs/about/index.html index 07680aa35a..1f9afc5a68 100644 --- a/docs/about/index.html +++ b/docs/about/index.html @@ -8,7 +8,7 @@ - + @@ -37,6 +37,6 @@ (opens new window)
Scaladoc (opens new window)

# About

Caliban is a project created by Pierre Ricadat aka @ghostdogpr (opens new window).

Current maintainers:

The name is inspired by the SF novel and tv series The Expanse (opens new window).

Thanks:

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The returned "),a("code",[t._v("ServerEndpoint")]),t._v(" use "),a("code",[t._v("RIO[R, *]")]),t._v(" as an effect type, but you can easily transform it to another effect type. 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"),a("li",[a("code",[e._v("genView")]),e._v(": If true, will generate a case class and helper method to select all fields on an object (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalarMappings")]),e._v(": A mapping from GraphQL scalar types to JVM types, as unknown scalar types are represented as "),a("code",[e._v("String")]),e._v(" by default.")]),e._v(" "),a("li",[a("code",[e._v("imports")]),e._v(": A list of imports to be added at the top of the generated code.")]),e._v(" "),a("li",[a("code",[e._v("splitFiles")]),e._v(": Whether to split the generated code into multiple files (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("enableFmt")]),e._v(": Enable code formatting with scalafmt (default: "),a("code",[e._v("true")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("extensibleEnums")]),e._v(": Generate a fallback case class for unknown enum values (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("headers")]),e._v(" (only defined for "),a("code",[e._v("url")]),e._v(" settings): Supply extra headers when fetching the schema from a URL.")]),e._v(" "),a("li",[a("code",[e._v("excludeDeprecated")]),e._v(": Exclude fields and enum values with deprecated directive (default: "),a("code",[e._v("false")]),e._v(").")])]),e._v(" "),a("h3",{attrs:{id:"manual-generation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#manual-generation"}},[e._v("#")]),e._v(" Manual generation")]),e._v(" "),a("p",[e._v("If you prefer to generate the client explicitly rather than automatically, you can use "),a("code",[e._v("calibanGenClient")]),e._v(" on the SBT CLI as follows:")]),e._v(" "),a("div",{staticClass:"language-bash extra-class"},[a("pre",{pre:!0,attrs:{class:"language-bash"}},[a("code",[e._v("calibanGenClient schemaPath outputPath "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--scalafmtPath path"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--headers name:value,name2:value2"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--genView "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--scalarMappings gqlType:f.q.d.n.Type,gqlType2:f.q.d.n.Type2"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--imports a.b.c._,c.d.E"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--splitFiles "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--enableFmt "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--extensibleEnums "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--excludeDeprecated "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[e._v("# example")]),e._v("\ncalibanGenClient project/schema.graphql src/main/client/Client.scala "),a("span",{pre:!0,attrs:{class:"token parameter variable"}},[e._v("--genView")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),e._v(" \n")])])]),a("p",[e._v("This command will generate a Scala file in "),a("code",[e._v("outputPath")]),e._v(" containing helper functions for all the types defined in the provided GraphQL schema defined at "),a("code",[e._v("schemaPath")]),e._v(".")]),e._v(" "),a("p",[e._v("If you need to disable generating clients from "),a("code",[e._v("src/main/graphql")]),e._v(", include "),a("code",[e._v("Compile / caliban / calibanGenerator := Seq.empty")]),e._v(" in your project settings.")]),e._v(" "),a("p",[e._v("The package of the generated code is derived from the folder of "),a("code",[e._v("outputPath")]),e._v(". This can be overridden by providing an alternative package with the "),a("code",[e._v("--packageName")]),e._v(" option.\nSimilarly, the generated object name is derived from "),a("code",[e._v("outputPath")]),e._v(" file name but can be overridden with the "),a("code",[e._v("--clientName")]),e._v(" option.")]),e._v(" "),a("p",[e._v("Other options are explained above.")]),e._v(" "),a("h2",{attrs:{id:"compiletimecalibanplugin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#compiletimecalibanplugin"}},[e._v("#")]),e._v(" CompileTimeCalibanPlugin")]),e._v(" "),a("p",[e._v("As mentioned in the introduction of the "),a("a",{attrs:{href:"#code-generation"}},[e._v("Code Generation")]),e._v(' chapter, this "meta" plugin is actually made of two "concrete" sbt plugins, '),a("code",[e._v("CompileTimeCalibanServerPlugin")]),e._v(" and "),a("code",[e._v("CompileTimeCalibanClientPlugin")]),e._v(",\nthat you'll both need to configure in your project be able to generate your Caliban client code from your Caliban server code..")]),e._v(" "),a("p",[e._v("You can find a demo project using this plugin here: "),a("a",{attrs:{href:"https://github.com/guizmaii/poc_compile_time_caliban_client_generation",target:"_blank",rel:"noopener noreferrer"}},[e._v("Demo project"),a("OutboundLink")],1)]),e._v(" "),a("p",[e._v("To generate the Caliban client code from you Caliban server code, you need to do two things:")]),e._v(" "),a("ol",[a("li",[a("p",[e._v("Tell to the plugin where your Caliban "),a("code",[e._v("GraphQL[R]")]),e._v(" instances for which you want to generate a client are and configure the client code generator."),a("br"),e._v("\nHow to configure this is explained in the following "),a("a",{attrs:{href:"#server-side-configuration"}},[e._v("Server side configuration")]),e._v(" chapter.")])]),e._v(" "),a("li",[a("p",[e._v("Tell to the plugin where you want to generate your client(s)."),a("br"),e._v("\nHow to configure this is explained in the following "),a("a",{attrs:{href:"#client-side-configuration"}},[e._v("Client side configuration")]),e._v(" chapter.")])])]),e._v(" "),a("h3",{attrs:{id:"server-side-configuration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#server-side-configuration"}},[e._v("#")]),e._v(" Server side configuration")]),e._v(" "),a("p",[e._v("First, you'll need to activate the "),a("code",[e._v("CompileTimeCalibanServerPlugin")]),e._v(" plugin in all the sbt modules of your project containing a "),a("code",[e._v("GraphQL[R]")]),e._v(" instance for which you want to generate a client.")]),e._v(" "),a("p",[e._v("Let's say you have an "),a("code",[e._v("api")]),e._v(" sbt module defined in your "),a("code",[e._v("build.sbt")]),e._v(" which contains your Caliban server code:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('Now, you need to tell to the "server side" plugin where is your '),a("code",[e._v("GraphQL[R]")]),e._v(" instance for which you want to generate a client."),a("br"),e._v("\nThis "),a("code",[e._v("GraphQL[R]")]),e._v(" instance need to be "),a("code",[e._v("public")]),e._v(". If it's "),a("code",[e._v("private")]),e._v(" or "),a("code",[e._v("protected")]),e._v(", the plugin code generator will not have access to it and will fail.")]),e._v(" "),a("p",[e._v("Let's say you have an object "),a("code",[e._v("CalibanServer")]),e._v(" object in your "),a("code",[e._v("api")]),e._v(" sbt module:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("package")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[e._v("com"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("example"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("my"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("awesome"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("project"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("api")]),e._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("import")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[e._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")])]),e._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("object")]),e._v(" CalibanServer "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" graphqlApi"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),e._v(" GraphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("Resolvers"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("resolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n \n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),a("p",[e._v("You'll need to add in your sbt definition:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServer "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServerSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.api.CalibanServer.graphqlApi"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("->")]),e._v(" ClientGenerationSettings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("default\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('This is the minimal working configuration for the "server side".')]),e._v(" "),a("p",[e._v("Now, you may want to tweak how the client code is generated."),a("br"),e._v("\nFor that, you'll have to replace the "),a("code",[e._v("ClientGenerationSettings.default")]),e._v(" with the configuration that suits you the best."),a("br"),e._v("\nThis "),a("code",[e._v("ClientGenerationSettings")]),e._v(" case class gives you the following configuration options:")]),e._v(" "),a("ul",[a("li",[a("code",[e._v("packageName")]),e._v(": The package in which the code will be generated (default: "),a("code",[e._v("generated")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("clientName")]),e._v(": The name of the client class generated (default: "),a("code",[e._v("Client")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalafmtPath")]),e._v(": Path to a scalafmt config file (default: "),a("code",[e._v(".scalafmt.conf")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("genView")]),e._v(": If true, will generate a case class and helper method to select all fields on an object (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalarMappings")]),e._v(": A mapping from GraphQL scalar types to JVM types, as unknown scalar types are represented as "),a("code",[e._v("String")]),e._v(" by default.")]),e._v(" "),a("li",[a("code",[e._v("imports")]),e._v(": A list of imports to be added at the top of the generated code.")]),e._v(" "),a("li",[a("code",[e._v("splitFiles")]),e._v(": Whether to split the generated code into multiple files (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("enableFmt")]),e._v(": Enable code formatting with scalafmt (default: "),a("code",[e._v("true")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("extensibleEnums")]),e._v(": Generate a fallback case class for unknown enum values (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("excludeDeprecated")]),e._v(": Exclude fields or enum values with deprecated directive (default: "),a("code",[e._v("false")]),e._v(").")])]),e._v(" "),a("p",[e._v("Let's take an example:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServer "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServerSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.api.CalibanServer.graphqlApi"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("->")]),e._v("\n ClientGenerationSettings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n packageName "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.client.generated"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n clientName "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"CalibanClient"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n splitFiles "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('That\'s all. You now know how to configure the "server side" of this plugin.'),a("br"),e._v('\nLet\'s now see how to configure the "client side".')]),e._v(" "),a("h3",{attrs:{id:"client-side-configuration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#client-side-configuration"}},[e._v("#")]),e._v(" Client side configuration")]),e._v(" "),a("p",[e._v('The "client side" of this plugin is here to help you define where your Caliban client code is generated.')]),e._v(" "),a("p",[e._v("The first thing to do is to activate the "),a("code",[e._v("CompileTimeCalibanClientPlugin")]),e._v(" in the sbt module where you want your Caliban client code to be generated into.")]),e._v(" "),a("p",[e._v("Let's say you have a "),a("code",[e._v("client")]),e._v(" sbt module defined in your "),a("code",[e._v("build.sbt")]),e._v(":")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("You only have one thing left to do."),a("br"),e._v('\nYou need to reference your "server side" sbt module (here '),a("code",[e._v("api")]),e._v(') in your "client side" sbt module (here '),a("code",[e._v("client")]),e._v(") definition so the plugin knows that you want to generate the Caliban client code for your "),a("code",[e._v("api")]),e._v(" server\nin this "),a("code",[e._v("client")]),e._v(" sbt module:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("api"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('This is the minimal working configuration for the "client side".')]),e._v(" "),a("p",[e._v("By default, the Caliban client code will be generated in your "),a("code",[e._v("src/main/scala")]),e._v(" directory of your "),a("code",[e._v("client")]),e._v(" sbt module."),a("br"),e._v("\nYou may prefer it not to be generated inside your - usually versioned-in-git - module code.\nFor that, the plugin provides an option to generate the code in the "),a("code",[e._v("target")]),e._v(" directory instead:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("api"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsVersionedCode "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("false")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[e._v("// By default, it's true.")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("You're done. 🎉"),a("br"),e._v("\nYou can now reload your sbt config and recompile your project. Your Caliban client code will be generated during the compilation process.")]),e._v(" "),a("h3",{attrs:{id:"additional-information-about-compiletimecalibanplugin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#additional-information-about-compiletimecalibanplugin"}},[e._v("#")]),e._v(" Additional information about CompileTimeCalibanPlugin")]),e._v(" "),a("p",[e._v("As you may have seen in the "),a("a",{attrs:{href:"https://github.com/guizmaii/poc_compile_time_caliban_client_generation",target:"_blank",rel:"noopener noreferrer"}},[e._v("demo project"),a("OutboundLink")],1),e._v(", you can have more complex configurations for this plugin."),a("br"),e._v("\nYou can have more than one "),a("code",[e._v("GraphQL[R]")]),e._v(" instance per server. Each "),a("code",[e._v("GraphQL[R]")]),e._v(" instance can have its own client code generation configuration."),a("br"),e._v('\nYou can also have multiple "servers" referenced in your "client" module. The plugin will generate all the clients for all the "servers" referenced in your sbt definition.')])])}),[],!1,null,null,null);a.default=s.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[26],{307:function(e,a,t){"use strict";t.r(a);var n=t(14),s=Object(n.a)({},(function(){var e=this,a=e._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[a("h1",{attrs:{id:"code-generation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#code-generation"}},[e._v("#")]),e._v(" Code Generation")]),e._v(" "),a("p",[e._v("Caliban provides two sbt plugins to generate your client(s) code.")]),e._v(" "),a("p",[e._v("The first one, named "),a("code",[e._v("CalibanPlugin")]),e._v(", allows you to generate the client code from a schema file or from a server URL, manually or automatically.")]),e._v(" "),a("p",[e._v("The second one, named "),a("code",[e._v("CompileTimeCalibanPlugin")]),e._v(', allows you to generate the client code from your server code.\nThis second "meta" plugin is actually made of two "concrete" plugins, '),a("code",[e._v("CompileTimeCalibanServerPlugin")]),e._v(" and "),a("code",[e._v("CompileTimeCalibanClientPlugin")]),e._v(", that you'll\nboth need to configure in your project to be able to generate you Caliban client code from your Caliban server code.")]),e._v(" "),a("p",[e._v("To use any of these two plugins, you'll first need to add following dependency to your "),a("code",[e._v("project/plugins.sbt")]),e._v(" file:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[e._v("addSbtPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.github.ghostdogpr"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("%")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"caliban-codegen-sbt"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("%")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"2.6.0"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("h2",{attrs:{id:"calibanplugin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#calibanplugin"}},[e._v("#")]),e._v(" CalibanPlugin")]),e._v(" "),a("p",[e._v("The first step for building GraphQL queries with "),a("code",[e._v("caliban-client")]),e._v(" is to generate boilerplate code from a GraphQL schema. For that, you need a file containing your schema (if your backend uses "),a("code",[e._v("caliban")]),e._v(", you can get it by calling "),a("code",[e._v("GraphQL#render")]),e._v(" on your API).")]),e._v(" "),a("p",[e._v("And enable it in your "),a("code",[e._v("build.sbt")]),e._v(" file:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CalibanPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("h3",{attrs:{id:"from-a-schema-file"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#from-a-schema-file"}},[e._v("#")]),e._v(" From a schema file")]),e._v(" "),a("p",[e._v("At this point, the "),a("code",[e._v("caliban")]),e._v(" command will cause any files in "),a("code",[e._v("src/main/graphql")]),e._v(" to be translated into a Caliban-generated client library. This happens automatically any time you "),a("code",[e._v("compile")]),e._v(".")]),e._v(" "),a("p",[e._v("By default, all clients are generated with the same client name as the source file, in the "),a("code",[e._v("caliban")]),e._v(" top-level package.")]),e._v(" "),a("p",[e._v("In order to supply more configuration options to the code generator, you can use the "),a("code",[e._v("calibanSettings")]),e._v(" sbt setting, combined with the "),a("code",[e._v("calibanSetting")]),e._v(" function to scope the settings to a particular file:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[e._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[e._v('// The `file("Service.graphql")` is a path suffix for some file in `src/main/graphql`')]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" caliban "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" 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"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("The path where the generator will look for schemas can be customized by overriding the "),a("code",[e._v("calibanSources")]),e._v(" settings:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[e._v("Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" caliban "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" calibanSources "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" file"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"caliban"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("If you want to cherry-pick certain files yourself, you can override that as well with 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punctuation"}},[e._v(".")]),e._v("packageName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.graphql.client"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("h3",{attrs:{id:"generation-settings"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#generation-settings"}},[e._v("#")]),e._v(" Generation settings")]),e._v(" "),a("p",[e._v("The settings available on the "),a("code",[e._v("cs")]),e._v(" ("),a("code",[e._v("CalibanSettings")]),e._v(") builder are:")]),e._v(" "),a("ul",[a("li",[a("code",[e._v("packageName")]),e._v(": The package in which the code will be generated (default: "),a("code",[e._v("caliban")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalafmtPath")]),e._v(": Path to a scalafmt config file (default: "),a("code",[e._v(".scalafmt.conf")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("genView")]),e._v(": If true, will generate a case class and helper method to select all fields on an object (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalarMappings")]),e._v(": A mapping from GraphQL scalar types to JVM types, as unknown scalar types are represented as "),a("code",[e._v("String")]),e._v(" by default.")]),e._v(" "),a("li",[a("code",[e._v("imports")]),e._v(": A list of imports to be added at the top of the generated code.")]),e._v(" "),a("li",[a("code",[e._v("splitFiles")]),e._v(": Whether to split the generated code into multiple files (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("enableFmt")]),e._v(": Enable code formatting with scalafmt (default: "),a("code",[e._v("true")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("extensibleEnums")]),e._v(": Generate a fallback case class for unknown enum values (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("headers")]),e._v(" (only defined for "),a("code",[e._v("url")]),e._v(" settings): Supply extra headers when fetching the schema from a URL.")]),e._v(" "),a("li",[a("code",[e._v("excludeDeprecated")]),e._v(": Exclude fields and enum values with deprecated directive (default: "),a("code",[e._v("false")]),e._v(").")])]),e._v(" "),a("h3",{attrs:{id:"manual-generation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#manual-generation"}},[e._v("#")]),e._v(" Manual generation")]),e._v(" "),a("p",[e._v("If you prefer to generate the client explicitly rather than automatically, you can use "),a("code",[e._v("calibanGenClient")]),e._v(" on the SBT CLI as follows:")]),e._v(" "),a("div",{staticClass:"language-bash extra-class"},[a("pre",{pre:!0,attrs:{class:"language-bash"}},[a("code",[e._v("calibanGenClient schemaPath outputPath "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--scalafmtPath path"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--headers name:value,name2:value2"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--genView "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--scalarMappings gqlType:f.q.d.n.Type,gqlType2:f.q.d.n.Type2"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--imports a.b.c._,c.d.E"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--splitFiles "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--enableFmt "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--extensibleEnums "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("--excludeDeprecated "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("|")]),e._v("false"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[e._v("# example")]),e._v("\ncalibanGenClient project/schema.graphql src/main/client/Client.scala "),a("span",{pre:!0,attrs:{class:"token parameter variable"}},[e._v("--genView")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),e._v(" \n")])])]),a("p",[e._v("This command will generate a Scala file in "),a("code",[e._v("outputPath")]),e._v(" containing helper functions for all the types defined in the provided GraphQL schema defined at "),a("code",[e._v("schemaPath")]),e._v(".")]),e._v(" "),a("p",[e._v("If you need to disable generating clients from "),a("code",[e._v("src/main/graphql")]),e._v(", include "),a("code",[e._v("Compile / caliban / calibanGenerator := Seq.empty")]),e._v(" in your project settings.")]),e._v(" "),a("p",[e._v("The package of the generated code is derived from the folder of "),a("code",[e._v("outputPath")]),e._v(". This can be overridden by providing an alternative package with the "),a("code",[e._v("--packageName")]),e._v(" option.\nSimilarly, the generated object name is derived from "),a("code",[e._v("outputPath")]),e._v(" file name but can be overridden with the "),a("code",[e._v("--clientName")]),e._v(" option.")]),e._v(" "),a("p",[e._v("Other options are explained above.")]),e._v(" "),a("h2",{attrs:{id:"compiletimecalibanplugin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#compiletimecalibanplugin"}},[e._v("#")]),e._v(" CompileTimeCalibanPlugin")]),e._v(" "),a("p",[e._v("As mentioned in the introduction of the "),a("a",{attrs:{href:"#code-generation"}},[e._v("Code Generation")]),e._v(' chapter, this "meta" plugin is actually made of two "concrete" sbt plugins, '),a("code",[e._v("CompileTimeCalibanServerPlugin")]),e._v(" and "),a("code",[e._v("CompileTimeCalibanClientPlugin")]),e._v(",\nthat you'll both need to configure in your project be able to generate your Caliban client code from your Caliban server code..")]),e._v(" "),a("p",[e._v("You can find a demo project using this plugin here: "),a("a",{attrs:{href:"https://github.com/guizmaii/poc_compile_time_caliban_client_generation",target:"_blank",rel:"noopener noreferrer"}},[e._v("Demo project"),a("OutboundLink")],1)]),e._v(" "),a("p",[e._v("To generate the Caliban client code from you Caliban server code, you need to do two things:")]),e._v(" "),a("ol",[a("li",[a("p",[e._v("Tell to the plugin where your Caliban "),a("code",[e._v("GraphQL[R]")]),e._v(" instances for which you want to generate a client are and configure the client code generator."),a("br"),e._v("\nHow to configure this is explained in the following "),a("a",{attrs:{href:"#server-side-configuration"}},[e._v("Server side configuration")]),e._v(" chapter.")])]),e._v(" "),a("li",[a("p",[e._v("Tell to the plugin where you want to generate your client(s)."),a("br"),e._v("\nHow to configure this is explained in the following "),a("a",{attrs:{href:"#client-side-configuration"}},[e._v("Client side configuration")]),e._v(" chapter.")])])]),e._v(" "),a("h3",{attrs:{id:"server-side-configuration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#server-side-configuration"}},[e._v("#")]),e._v(" Server side configuration")]),e._v(" "),a("p",[e._v("First, you'll need to activate the "),a("code",[e._v("CompileTimeCalibanServerPlugin")]),e._v(" plugin in all the sbt modules of your project containing a "),a("code",[e._v("GraphQL[R]")]),e._v(" instance for which you want to generate a client.")]),e._v(" "),a("p",[e._v("Let's say you have an "),a("code",[e._v("api")]),e._v(" sbt module defined in your "),a("code",[e._v("build.sbt")]),e._v(" which contains your Caliban server code:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('Now, you need to tell to the "server side" plugin where is your '),a("code",[e._v("GraphQL[R]")]),e._v(" instance for which you want to generate a client."),a("br"),e._v("\nThis "),a("code",[e._v("GraphQL[R]")]),e._v(" instance need to be "),a("code",[e._v("public")]),e._v(". If it's "),a("code",[e._v("private")]),e._v(" or "),a("code",[e._v("protected")]),e._v(", the plugin code generator will not have access to it and will fail.")]),e._v(" "),a("p",[e._v("Let's say you have an object "),a("code",[e._v("CalibanServer")]),e._v(" object in your "),a("code",[e._v("api")]),e._v(" sbt module:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("package")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[e._v("com"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("example"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("my"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("awesome"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("project"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("api")]),e._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("import")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[e._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")])]),e._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("object")]),e._v(" CalibanServer "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("{")]),e._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" graphqlApi"),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),e._v(" GraphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("[")]),e._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("]")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("Resolvers"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("resolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n \n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("}")]),e._v("\n")])])]),a("p",[e._v("You'll need to add in your sbt definition:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServer "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServerSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.api.CalibanServer.graphqlApi"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("->")]),e._v(" ClientGenerationSettings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("default\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('This is the minimal working configuration for the "server side".')]),e._v(" "),a("p",[e._v("Now, you may want to tweak how the client code is generated."),a("br"),e._v("\nFor that, you'll have to replace the "),a("code",[e._v("ClientGenerationSettings.default")]),e._v(" with the configuration that suits you the best."),a("br"),e._v("\nThis "),a("code",[e._v("ClientGenerationSettings")]),e._v(" case class gives you the following configuration options:")]),e._v(" "),a("ul",[a("li",[a("code",[e._v("packageName")]),e._v(": The package in which the code will be generated (default: "),a("code",[e._v("generated")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("clientName")]),e._v(": The name of the client class generated (default: "),a("code",[e._v("Client")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalafmtPath")]),e._v(": Path to a scalafmt config file (default: "),a("code",[e._v(".scalafmt.conf")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("genView")]),e._v(": If true, will generate a case class and helper method to select all fields on an object (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("scalarMappings")]),e._v(": A mapping from GraphQL scalar types to JVM types, as unknown scalar types are represented as "),a("code",[e._v("String")]),e._v(" by default.")]),e._v(" "),a("li",[a("code",[e._v("imports")]),e._v(": A list of imports to be added at the top of the generated code.")]),e._v(" "),a("li",[a("code",[e._v("splitFiles")]),e._v(": Whether to split the generated code into multiple files (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("enableFmt")]),e._v(": Enable code formatting with scalafmt (default: "),a("code",[e._v("true")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("extensibleEnums")]),e._v(": Generate a fallback case class for unknown enum values (default: "),a("code",[e._v("false")]),e._v(").")]),e._v(" "),a("li",[a("code",[e._v("excludeDeprecated")]),e._v(": Exclude fields or enum values with deprecated directive (default: "),a("code",[e._v("false")]),e._v(").")])]),e._v(" "),a("p",[e._v("Let's take an example:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanServerPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServer "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanServerSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.api.CalibanServer.graphqlApi"')]),e._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("->")]),e._v("\n ClientGenerationSettings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n packageName "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"com.example.my.awesome.project.client.generated"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n clientName "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[e._v('"CalibanClient"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n splitFiles "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("true")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('That\'s all. You now know how to configure the "server side" of this plugin.'),a("br"),e._v('\nLet\'s now see how to configure the "client side".')]),e._v(" "),a("h3",{attrs:{id:"client-side-configuration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#client-side-configuration"}},[e._v("#")]),e._v(" Client side configuration")]),e._v(" "),a("p",[e._v('The "client side" of this plugin is here to help you define where your Caliban client code is generated.')]),e._v(" "),a("p",[e._v("The first thing to do is to activate the "),a("code",[e._v("CompileTimeCalibanClientPlugin")]),e._v(" in the sbt module where you want your Caliban client code to be generated into.")]),e._v(" "),a("p",[e._v("Let's say you have a "),a("code",[e._v("client")]),e._v(" sbt module defined in your "),a("code",[e._v("build.sbt")]),e._v(":")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("You only have one thing left to do."),a("br"),e._v('\nYou need to reference your "server side" sbt module (here '),a("code",[e._v("api")]),e._v(') in your "client side" sbt module (here '),a("code",[e._v("client")]),e._v(") definition so the plugin knows that you want to generate the Caliban client code for your "),a("code",[e._v("api")]),e._v(" server\nin this "),a("code",[e._v("client")]),e._v(" sbt module:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("api"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v('This is the minimal working configuration for the "client side".')]),e._v(" "),a("p",[e._v("By default, the Caliban client code will be generated in your "),a("code",[e._v("src/main/scala")]),e._v(" directory of your "),a("code",[e._v("client")]),e._v(" sbt module."),a("br"),e._v("\nYou may prefer it not to be generated inside your - usually versioned-in-git - module code.\nFor that, the plugin provides an option to generate the code in the "),a("code",[e._v("target")]),e._v(" directory instead:")]),e._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("lazy")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[e._v("val")]),e._v(" client "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v("\n project\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("CompileTimeCalibanClientPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(".")]),e._v("settings"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsSettings "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" Seq"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v("(")]),e._v("api"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(",")]),e._v("\n Compile "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClient "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("/")]),e._v(" ctCalibanClientsVersionedCode "),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v(":")]),a("span",{pre:!0,attrs:{class:"token operator"}},[e._v("=")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[e._v("false")]),e._v(" "),a("span",{pre:!0,attrs:{class:"token comment"}},[e._v("// By default, it's true.")]),e._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[e._v(")")]),e._v("\n")])])]),a("p",[e._v("You're done. 🎉"),a("br"),e._v("\nYou can now reload your sbt config and recompile your project. Your Caliban client code will be generated during the compilation process.")]),e._v(" "),a("h3",{attrs:{id:"additional-information-about-compiletimecalibanplugin"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#additional-information-about-compiletimecalibanplugin"}},[e._v("#")]),e._v(" Additional information about CompileTimeCalibanPlugin")]),e._v(" "),a("p",[e._v("As you may have seen in the "),a("a",{attrs:{href:"https://github.com/guizmaii/poc_compile_time_caliban_client_generation",target:"_blank",rel:"noopener noreferrer"}},[e._v("demo project"),a("OutboundLink")],1),e._v(", you can have more complex configurations for this plugin."),a("br"),e._v("\nYou can have more than one "),a("code",[e._v("GraphQL[R]")]),e._v(" instance per server. Each "),a("code",[e._v("GraphQL[R]")]),e._v(" instance can have its own client code generation configuration."),a("br"),e._v('\nYou can also have multiple "servers" referenced in your "client" module. The plugin will generate all the clients for all the "servers" referenced in your sbt definition.')])])}),[],!1,null,null,null);a.default=s.exports}}]); \ No newline at end of file diff --git a/docs/assets/js/27.0fbe255b.js b/docs/assets/js/27.f9481e20.js similarity index 99% rename from docs/assets/js/27.0fbe255b.js rename to docs/assets/js/27.f9481e20.js index 910244ce4e..5f39081e0a 100644 --- a/docs/assets/js/27.0fbe255b.js +++ b/docs/assets/js/27.f9481e20.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[27],{307:function(t,a,s){"use strict";s.r(a);var e=s(14),n=Object(e.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[a("strong",[t._v("Caliban Client")]),t._v(" is a module independent from Caliban Server that makes it possible to write GraphQL queries using Scala code in a type-safe and functional fashion. It is built on top of "),a("a",{attrs:{href:"https://github.com/softwaremill/sttp",target:"_blank",rel:"noopener noreferrer"}},[t._v("sttp"),a("OutboundLink")],1),t._v(", which means you can run requests using the backend of your choice.")]),t._v(" "),a("p",[t._v("Just like the server module, Caliban Client offers a purely functional interface and keeps the boilerplate minimal. It works as follows:")]),t._v(" "),a("ol",[a("li",[t._v("Use the "),a("code",[t._v("caliban-codegen-sbt")]),t._v(" tool to generate boilerplate code from a given GraphQL schema")]),t._v(" "),a("li",[t._v("Write your GraphQL queries/mutations by combining helpers from the generated code")]),t._v(" "),a("li",[t._v("Transform your queries/mutations into an "),a("code",[t._v("sttp")]),t._v(" request and run them with your preferred backend")])]),t._v(" "),a("h2",{attrs:{id:"dependencies"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#dependencies"}},[t._v("#")]),t._v(" Dependencies")]),t._v(" "),a("p",[t._v("To use "),a("code",[t._v("caliban-client")]),t._v(", add the following dependency to your "),a("code",[t._v("build.sbt")]),t._v(" file:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-client"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),t._v("\n")])])]),a("p",[t._v("Caliban-client is available for ScalaJS. To use it in a ScalaJS project, instead add this dependency to your "),a("code",[t._v("build.sbt")]),t._v(" file:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-client"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),t._v("\n")])])]),a("h2",{attrs:{id:"code-generation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#code-generation"}},[t._v("#")]),t._v(" Code generation")]),t._v(" "),a("p",[t._v("Caliban provides several ways to generate the boilerplate code. To get started, we are going to generate it by running a\nsimple sbt command, but you can look at the "),a("RouterLink",{attrs:{to:"/docs/client-codegen.html"}},[t._v("Code generation")]),t._v(" page for more options.")],1),t._v(" "),a("p",[t._v("You'll first need to add following dependency to your "),a("code",[t._v("project/plugins.sbt")]),t._v(" file:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[t._v("addSbtPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-codegen-sbt"')]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("And to enable the plugin in your "),a("code",[t._v("build.sbt")]),t._v(" file:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[t._v("enablePlugins"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("CalibanPlugin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("Then, you can run the following command in your sbt.")]),t._v(" "),a("div",{staticClass:"language-bash extra-class"},[a("pre",{pre:!0,attrs:{class:"language-bash"}},[a("code",[t._v("calibanGenClient schemaPath outputPath\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("# example")]),t._v("\ncalibanGenClient project/schema.graphql src/main/client/Client.scala\n")])])]),a("p",[a("code",[t._v("schemaPath")]),t._v(" is the path to a GraphQL schema file (if your backend uses "),a("code",[t._v("caliban")]),t._v(", you can get it by calling "),a("code",[t._v("GraphQL#render")]),t._v(" on your API).\nInstead of a file, you can provide a URL and the schema will be obtained using introspection.")]),t._v(" "),a("p",[a("code",[t._v("outputPath")]),t._v(" is the path where the generated code will be written. The folder needs to exist.")]),t._v(" "),a("p",[t._v("This command will generate a Scala file in "),a("code",[t._v("outputPath")]),t._v(" containing helper functions for all the types defined in the provided GraphQL schema defined at "),a("code",[t._v("schemaPath")]),t._v(".")]),t._v(" "),a("h2",{attrs:{id:"query-building"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#query-building"}},[t._v("#")]),t._v(" Query building")]),t._v(" "),a("p",[t._v("Once the boilerplate code is generated, you can start building queries. For each "),a("em",[t._v("type")]),t._v(" in your schema, a corresponding Scala object has been created. For each "),a("em",[t._v("field")]),t._v(" in your schema, a corresponding Scala function has been created.")]),t._v(" "),a("p",[t._v("For example, given the following schema:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("nicknames")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Your generated code will have the following:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Character "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" nicknames"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("A "),a("code",[t._v("SelectionBuilder[Origin, A]")]),t._v(" is a selection from a parent type "),a("code",[t._v("Origin")]),t._v(" that returns a result of type "),a("code",[t._v("A")]),t._v(". In this example, "),a("code",[t._v("name")]),t._v(" is a selection from a "),a("code",[t._v("Character")]),t._v(" that returns a "),a("code",[t._v("String")]),t._v(".")]),t._v(" "),a("p",[t._v("You can combine multiple selections using the "),a("code",[t._v("~")]),t._v(" operator. The new result type will be a tuple from the 2 combined result types. Note that you can only combine selections that have the same origin.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" selection"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames\n")])])]),a("p",[t._v("If you combine multiple fields, it is more convenient to have a case class to represent your data (to avoid seeing nested tuples). You can use "),a("code",[t._v("mapN")]),t._v(" to map a nested tuple to a case class.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" nickname"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("mapN"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("Fields that return an object type will require an inner selection, which is another "),a("code",[t._v("SelectionBuilder")]),t._v(". Let's consider the following "),a("code",[t._v("Query")]),t._v(" type.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("When calling "),a("code",[t._v("characters")]),t._v(", we need to provide a "),a("code",[t._v("SelectionBuilder[Character, ?]")]),t._v(" to indicate which fields to select on the returned "),a("code",[t._v("Character")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" query"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("RootQuery"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("characters "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("mapN"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Or if we reuse the "),a("code",[t._v("character")]),t._v(" selection we just created:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" query"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("RootQuery"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("characters "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n character\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Because this is Scala code, you can easily reuse a selection in multiple places without having to worry about GraphQL fragments. The Scala compiler will also make sure that you only combine fields that make sense.")]),t._v(" "),a("p",[t._v("When a field requires an argument, the helper method for the field will require one as well. Let's enrich our query:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("You now need to provide an "),a("code",[t._v("Origin")]),t._v(" when calling "),a("code",[t._v("characters")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" query"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("RootQuery"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("MARS"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n character\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("h2",{attrs:{id:"request-execution"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#request-execution"}},[t._v("#")]),t._v(" Request execution")]),t._v(" "),a("p",[t._v("Once your query or mutation is created, it is time to execute it. To do that, you can transform your "),a("code",[t._v("SelectionBuilder")]),t._v(" into an "),a("code",[t._v("sttp")]),t._v(" request by calling "),a("code",[t._v(".toRequest")]),t._v(".")]),t._v(" "),a("p",[t._v("This function takes the URL of your GraphQL server and some options:")]),t._v(" "),a("ul",[a("li",[t._v("a boolean "),a("code",[t._v("useVariables")]),t._v(" that determines if arguments should be using variables or not (default: false)")]),t._v(" "),a("li",[t._v("an optional string "),a("code",[t._v("queryName")]),t._v(" if you want to name your query (default: no name)")]),t._v(" "),a("li",[t._v("a boolean "),a("code",[t._v("dropNullInputValues")]),t._v(" that determines if null fields from input objects should be dropped (default: false)")])]),t._v(" "),a("p",[t._v("You can then simply run the "),a("code",[t._v("sttp")]),t._v(" request with the backend of your choice. See the "),a("a",{attrs:{href:"https://sttp.readthedocs.io/en/latest/",target:"_blank",rel:"noopener noreferrer"}},[t._v("sttp docs"),a("OutboundLink")],1),t._v(" if you are not familiar with it.")]),t._v(" "),a("p",[t._v("Here is an example using the "),a("code",[t._v("AsyncHttpClient")]),t._v(" backend for "),a("code",[t._v("ZIO")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("sttp"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("client3"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("sttp"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("client3"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("asynchttpclient"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("AsyncHttpClientZioBackend\n\nAsyncHttpClientZioBackend"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("flatMap "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" backend "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" serverUrl "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-interpolation"}},[a("span",{pre:!0,attrs:{class:"token id function"}},[t._v("uri")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"http://localhost:8088/api/graphql"')])]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" result"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Task"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("toRequest"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("serverUrl"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("send"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("map"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("body"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("absolve\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("As a result, we get a ZIO "),a("code",[t._v("Task")]),t._v(" whose return type is the same as our "),a("code",[t._v("SelectionBuilder")]),t._v(". The sttp request does not only contain the request to send, but also takes care of parsing the response into the expected type.")]),t._v(" "),a("p",[t._v("The "),a("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/tree/series/2.x/examples/",target:"_blank",rel:"noopener noreferrer"}},[t._v("examples"),a("OutboundLink")],1),t._v(" project contains a runnable sample code that queries the example GraphQL backend.")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Limitations")]),t._v(" "),a("p",[t._v("Only Queries and Mutations are supported as sttp requests.\nSubscriptions are supported in the laminext module, and this code can easily be adapted to other frameworks (the relevant code is only a few lines long).")]),t._v(" "),a("p",[t._v("Type extensions are not supported by the codegen tool.")])])])}),[],!1,null,null,null);a.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[27],{308:function(t,a,s){"use strict";s.r(a);var e=s(14),n=Object(e.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"getting-started"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),a("p",[a("strong",[t._v("Caliban Client")]),t._v(" is a module independent from Caliban Server that makes it possible to write GraphQL queries using Scala code in a type-safe and functional fashion. It is built on top of "),a("a",{attrs:{href:"https://github.com/softwaremill/sttp",target:"_blank",rel:"noopener noreferrer"}},[t._v("sttp"),a("OutboundLink")],1),t._v(", which means you can run requests using the backend of your choice.")]),t._v(" "),a("p",[t._v("Just like the server module, Caliban Client offers a purely functional interface and keeps the boilerplate minimal. 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The folder needs to exist.")]),t._v(" "),a("p",[t._v("This command will generate a Scala file in "),a("code",[t._v("outputPath")]),t._v(" containing helper functions for all the types defined in the provided GraphQL schema defined at "),a("code",[t._v("schemaPath")]),t._v(".")]),t._v(" "),a("h2",{attrs:{id:"query-building"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#query-building"}},[t._v("#")]),t._v(" Query building")]),t._v(" "),a("p",[t._v("Once the boilerplate code is generated, you can start building queries. For each "),a("em",[t._v("type")]),t._v(" in your schema, a corresponding Scala object has been created. For each "),a("em",[t._v("field")]),t._v(" in your schema, a corresponding Scala function has been created.")]),t._v(" "),a("p",[t._v("For example, given the following schema:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("nicknames")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Your generated code will have the following:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Character "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" nicknames"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("A "),a("code",[t._v("SelectionBuilder[Origin, A]")]),t._v(" is a selection from a parent type "),a("code",[t._v("Origin")]),t._v(" that returns a result of type "),a("code",[t._v("A")]),t._v(". In this example, "),a("code",[t._v("name")]),t._v(" is a selection from a "),a("code",[t._v("Character")]),t._v(" that returns a "),a("code",[t._v("String")]),t._v(".")]),t._v(" "),a("p",[t._v("You can combine multiple selections using the "),a("code",[t._v("~")]),t._v(" operator. The new result type will be a tuple from the 2 combined result types. Note that you can only combine selections that have the same origin.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" selection"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames\n")])])]),a("p",[t._v("If you combine multiple fields, it is more convenient to have a case class to represent your data (to avoid seeing nested tuples). You can use "),a("code",[t._v("mapN")]),t._v(" to map a nested tuple to a case class.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" nickname"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("mapN"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("Fields that return an object type will require an inner selection, which is another "),a("code",[t._v("SelectionBuilder")]),t._v(". Let's consider the following "),a("code",[t._v("Query")]),t._v(" type.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("When calling "),a("code",[t._v("characters")]),t._v(", we need to provide a "),a("code",[t._v("SelectionBuilder[Character, ?]")]),t._v(" to indicate which fields to select on the returned "),a("code",[t._v("Character")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" query"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("RootQuery"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("characters "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("nicknames "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("~")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("mapN"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Or if we reuse the "),a("code",[t._v("character")]),t._v(" selection we just created:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" query"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" SelectionBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("RootQuery"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("CharacterView"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Query"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("characters "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n character\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Because this is Scala code, you can easily reuse a selection in multiple places without having to worry about GraphQL fragments. The Scala compiler will also make sure that you only combine fields that make sense.")]),t._v(" "),a("p",[t._v("When a field requires an argument, the helper method for the field will require one as well. 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You can also see the full code example "),a("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/tree/series/2.x/examples/src/main/scala/example/federation",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1)]),t._v(" "),a("h2",{attrs:{id:"tracing"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#tracing"}},[t._v("#")]),t._v(" Tracing")]),t._v(" "),a("p",[t._v("Federated tracing is slightly different from standard apollo-tracing thus it comes with its own wrapper defined in the "),a("code",[t._v("caliban-federation")]),t._v(" module.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("federation"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("tracing"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ApolloFederatedTracing\n\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" schema @@ federated"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("resolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" additionalResolvers"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" _"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("*")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@ ApolloFederatedTracing"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("wrapper"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("In federated tracing the gateway communicates with the implementing service via a header "),a("code",[t._v("apollo-federation-include-trace")]),t._v(",\nfor now the only value it can send is "),a("code",[t._v("ftv1")]),t._v(". Thus if you detect this header then you should enable tracing otherwise you can disable it.")]),t._v(" "),a("p",[t._v("If you are using one of the wrappers you are done, they will automatically detect when the gateway\nenables tracing on a request. However, if you are calling the "),a("code",[t._v("interpreter.execute")]),t._v(" independently or you have some other custom\nset up you will need to add one more step to enable tracing.")]),t._v(" "),a("p",[t._v("If you wish to enable it manually (after detecting the header with your preferred framework) you can call: "),a("code",[t._v("request.withFederatedTracing")]),t._v(" which will return a new "),a("code",[t._v("GraphQLRequest")]),t._v(" that informs the wrapper\nthat it should include tracing data as part of the response extensions.")]),t._v(" "),a("h2",{attrs:{id:"federation-v2"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#federation-v2"}},[t._v("#")]),t._v(" Federation V2")]),t._v(" "),a("p",[t._v("Caliban can support the v2 federation specification as well. 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If you need to use\nan earlier version or you need to customize some aspect of the federation directives (for instance by providing your own "),a("code",[t._v("@composeDirective")]),t._v("s) you can do so by simply extending the "),a("code",[t._v("FederationV2")]),t._v(" class.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// With a package object but you can also create a normal object")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("package")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("object")]),t._v(" myFederation "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" FederationV2"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n Versions"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("v2_3 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("::")]),t._v(" \n Link"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"https://myspecs.dev/myDirective/v1.0"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n Import"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"@myDirective"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n Import"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"@anotherDirective"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" as "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Some"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"@hello"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("::")]),t._v(" \n ComposeDirective"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"@myDirective"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("::")]),t._v(" \n ComposeDirective"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"@hello"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("::")]),t._v(" Nil\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("with")]),t._v(" FederationDirectivesV2_3\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Then import your new federation object instead of `caliban.federation.v2_3`")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("myFederation"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n")])])])])}),[],!1,null,null,null);a.default=n.exports}}]); \ No newline at end of file diff --git a/docs/assets/js/30.89af4a0f.js b/docs/assets/js/30.cc13c839.js similarity index 99% rename from docs/assets/js/30.89af4a0f.js rename to docs/assets/js/30.cc13c839.js index 7d7daca1ed..b638a3a69f 100644 --- a/docs/assets/js/30.89af4a0f.js +++ b/docs/assets/js/30.cc13c839.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[30],{310:function(t,a,s){"use strict";s.r(a);var n=s(14),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"interop-with-other-libraries"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#interop-with-other-libraries"}},[t._v("#")]),t._v(" Interop with other libraries")]),t._v(" "),a("p",[t._v("If you prefer using "),a("a",{attrs:{href:"https://github.com/typelevel/cats-effect",target:"_blank",rel:"noopener noreferrer"}},[t._v("Cats Effect"),a("OutboundLink")],1),t._v(" or "),a("a",{attrs:{href:"https://github.com/monix/monix",target:"_blank",rel:"noopener noreferrer"}},[t._v("Monix"),a("OutboundLink")],1),t._v(" rather than ZIO, you can use the respective "),a("code",[t._v("caliban-cats")]),t._v(" and "),a("code",[t._v("caliban-monix")]),t._v(" modules.")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("caliban-tapir")]),t._v(" module allows converting your "),a("a",{attrs:{href:"https://github.com/softwaremill/tapir",target:"_blank",rel:"noopener noreferrer"}},[t._v("Tapir"),a("OutboundLink")],1),t._v(" endpoints into a GraphQL API.")]),t._v(" "),a("h2",{attrs:{id:"cats-effect"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#cats-effect"}},[t._v("#")]),t._v(" Cats Effect")]),t._v(" "),a("p",[t._v("You first need to import "),a("code",[t._v("caliban.interop.cats.implicits._")]),t._v(" and have an implicit "),a("code",[t._v("zio.Runtime")]),t._v(" in scope. 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a given value")]),t._v(" "),a("li",[a("code",[t._v("maxCost")]),t._v(" returns a wrapper that fails queries when the estimated cost of execution exceeds a given value")]),t._v(" "),a("li",[a("code",[t._v("queryCost")]),t._v(" returns a wrapper which adds an extension field that includes the cost of executing the query")]),t._v(" "),a("li",[a("code",[t._v("timeout")]),t._v(" returns a wrapper that fails queries taking more than a specified time")]),t._v(" "),a("li",[a("code",[t._v("printErrors")]),t._v(" returns a wrapper that prints errors")]),t._v(" "),a("li",[a("code",[t._v("printSlowQueries")]),t._v(" returns a wrapper that prints slow queries")]),t._v(" "),a("li",[a("code",[t._v("logSlowQueries")]),t._v(" returns a wrapper that logs slow queries via ZIO's built-in logging")]),t._v(" "),a("li",[a("code",[t._v("onSlowQueries")]),t._v(" returns a wrapper that can run a given function on slow queries")]),t._v(" "),a("li",[a("code",[t._v("metrics")]),t._v(" returns a wrapper that adds 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The result can then be used by http adapters to set the appropriate cache headers in the response.")]),t._v(" "),a("li",[a("code",[t._v("caliban.wrappers.ApolloPersistedQueries.apolloPersistedQueries")]),t._v(" returns a wrapper that caches and retrieves query using a hash using the "),a("a",{attrs:{href:"https://github.com/apollographql/apollo-link-persisted-queries",target:"_blank",rel:"noopener noreferrer"}},[t._v("Apollo Persisted Queries"),a("OutboundLink")],1),t._v(" format.")])]),t._v(" "),a("p",[t._v("They can be used like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n maxDepth"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("50")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n timeout"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("3")]),t._v(" seconds"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n printSlowQueries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("500")]),t._v(" millis"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n apolloTracing"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n Caching"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extension")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("h2",{attrs:{id:"wrapping-the-interpreter"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#wrapping-the-interpreter"}},[t._v("#")]),t._v(" Wrapping the interpreter")]),t._v(" "),a("p",[t._v("All the wrappers mentioned above require that you don't modify the environment "),a("code",[t._v("R")]),t._v(" and the error type which is always a "),a("code",[t._v("CalibanError")]),t._v(". It is also possible to wrap your "),a("code",[t._v("GraphQLInterpreter")]),t._v(" by calling "),a("code",[t._v("wrapExecutionWith")]),t._v(" on it. This method takes in a function "),a("code",[t._v("f")]),t._v(" and returns a new "),a("code",[t._v("GraphQLInterpreter")]),t._v(" that will wrap the "),a("code",[t._v("execute")]),t._v(" method with this function "),a("code",[t._v("f")]),t._v(".")]),t._v(" "),a("p",[t._v("It is used internally to implement "),a("code",[t._v("mapError")]),t._v(" (customize errors) and "),a("code",[t._v("provide")]),t._v(" (eliminate the environment), but you can use it for other purposes such as adding a general timeout, logging response times, etc.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" i"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" GraphQLInterpreter"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 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Caliban renders the different instances of "),a("code",[t._v("CalibanError")]),t._v(" to a GraphQL spec compliant response. As a user, you will most likely encounter "),a("code",[t._v("ExecutionError")]),t._v(" at some point because this will encapsulate the errors in the error channel of your effects. For Caliban to be able to render some basic message about the error that occured during query execution, it is important that your error extends "),a("code",[t._v("Throwable")]),t._v(".")]),t._v(" "),a("p",[t._v("For more meaningful error handling, GraphQL spec allows for an "),a("a",{attrs:{href:"http://spec.graphql.org/June2018/#example-fce18",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("extension")]),a("OutboundLink")],1),t._v(" object in the error response. This object may include, for instance, "),a("code",[t._v("code")]),t._v(" information to model enum-like error codes that can be handled by a front-end. In order to generate this information, one can use the "),a("code",[t._v("mapError")]),t._v(" function on a "),a("code",[t._v("GraphQLInterpreter")]),t._v(". 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For instance, we can add the directive to both types and\nto fields. In this case the field resolver will override the type cost, however if there is no field cost then the type cost will be used.\nWe may also specify a "multipliers" argument when using arguments. 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"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@ wrapper\n")])])]),a("h2",{attrs:{id:"pre-defined-wrappers"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#pre-defined-wrappers"}},[t._v("#")]),t._v(" Pre-defined wrappers")]),t._v(" "),a("p",[t._v("Caliban comes with a few pre-made wrappers in "),a("code",[t._v("caliban.wrappers.Wrappers")]),t._v(":")]),t._v(" "),a("ul",[a("li",[a("code",[t._v("maxDepth")]),t._v(" returns a wrapper that fails queries whose depth is higher than a given value")]),t._v(" "),a("li",[a("code",[t._v("maxFields")]),t._v(" returns a wrapper that fails queries whose number of fields is higher than a given value")]),t._v(" "),a("li",[a("code",[t._v("maxCost")]),t._v(" returns a wrapper that fails queries when the estimated cost of execution exceeds a given value")]),t._v(" "),a("li",[a("code",[t._v("queryCost")]),t._v(" returns a wrapper which adds an extension field that includes the cost of executing the query")]),t._v(" "),a("li",[a("code",[t._v("timeout")]),t._v(" returns a wrapper that fails queries taking more than a specified time")]),t._v(" "),a("li",[a("code",[t._v("printErrors")]),t._v(" returns a wrapper that prints errors")]),t._v(" "),a("li",[a("code",[t._v("printSlowQueries")]),t._v(" returns a wrapper that prints slow queries")]),t._v(" "),a("li",[a("code",[t._v("logSlowQueries")]),t._v(" returns a wrapper that logs slow queries via ZIO's built-in logging")]),t._v(" "),a("li",[a("code",[t._v("onSlowQueries")]),t._v(" returns a wrapper that can run a given function on slow queries")]),t._v(" "),a("li",[a("code",[t._v("metrics")]),t._v(" returns a wrapper that adds field-level metrics (count & duration) to the schema")])]),t._v(" "),a("p",[t._v("In addition to those, Caliban also ships with some non-spec but standard wrappers")]),t._v(" "),a("ul",[a("li",[a("code",[t._v("caliban.wrappers.ApolloTracing.apolloTracing")]),t._v(" returns a wrapper that adds tracing data into the "),a("code",[t._v("extensions")]),t._v(" field of each response following "),a("a",{attrs:{href:"https://github.com/apollographql/apollo-tracing",target:"_blank",rel:"noopener noreferrer"}},[t._v("Apollo Tracing"),a("OutboundLink")],1),t._v(" format.")]),t._v(" "),a("li",[a("code",[t._v("caliban.wrappers.Caching.extension")]),t._v(" returns a wrapper that computes the total cache policy for a query and stores it in the extensions of the response. The result can then be used by http adapters to set the appropriate cache headers in the response.")]),t._v(" "),a("li",[a("code",[t._v("caliban.wrappers.ApolloPersistedQueries.apolloPersistedQueries")]),t._v(" returns a wrapper that caches and retrieves query using a hash using the "),a("a",{attrs:{href:"https://github.com/apollographql/apollo-link-persisted-queries",target:"_blank",rel:"noopener noreferrer"}},[t._v("Apollo Persisted Queries"),a("OutboundLink")],1),t._v(" format.")])]),t._v(" "),a("p",[t._v("They can be used like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n maxDepth"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("50")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n timeout"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("3")]),t._v(" seconds"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n printSlowQueries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token number"}},[t._v("500")]),t._v(" millis"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n apolloTracing"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" @@\n Caching"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extension")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("h2",{attrs:{id:"wrapping-the-interpreter"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#wrapping-the-interpreter"}},[t._v("#")]),t._v(" Wrapping the interpreter")]),t._v(" "),a("p",[t._v("All the wrappers mentioned above require that you don't modify the environment "),a("code",[t._v("R")]),t._v(" and the error type which is always a "),a("code",[t._v("CalibanError")]),t._v(". It is also possible to wrap your "),a("code",[t._v("GraphQLInterpreter")]),t._v(" by calling "),a("code",[t._v("wrapExecutionWith")]),t._v(" on it. This method takes in a function "),a("code",[t._v("f")]),t._v(" and returns a new "),a("code",[t._v("GraphQLInterpreter")]),t._v(" that will wrap the "),a("code",[t._v("execute")]),t._v(" method with this function "),a("code",[t._v("f")]),t._v(".")]),t._v(" "),a("p",[t._v("It is used internally to implement "),a("code",[t._v("mapError")]),t._v(" (customize errors) and "),a("code",[t._v("provide")]),t._v(" (eliminate the environment), but you can use it for other purposes such as adding a general timeout, logging response times, etc.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" i"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" GraphQLInterpreter"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" 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i"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("mapError"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("toString"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// provide the environment")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" i3"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" GraphQLInterpreter"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" CalibanError"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" i"),a("span",{pre:!0,attrs:{class:"token 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Caliban renders the different instances of "),a("code",[t._v("CalibanError")]),t._v(" to a GraphQL spec compliant response. As a user, you will most likely encounter "),a("code",[t._v("ExecutionError")]),t._v(" at some point because this will encapsulate the errors in the error channel of your effects. For Caliban to be able to render some basic message about the error that occured during query execution, it is important that your error extends "),a("code",[t._v("Throwable")]),t._v(".")]),t._v(" "),a("p",[t._v("For more meaningful error handling, GraphQL spec allows for an "),a("a",{attrs:{href:"http://spec.graphql.org/June2018/#example-fce18",target:"_blank",rel:"noopener noreferrer"}},[a("code",[t._v("extension")]),a("OutboundLink")],1),t._v(" object in the error response. This object may include, for instance, "),a("code",[t._v("code")]),t._v(" information to model enum-like error codes that can be handled by a front-end. In order to generate this information, one can use the "),a("code",[t._v("mapError")]),t._v(" function on a "),a("code",[t._v("GraphQLInterpreter")]),t._v(". An example is provided below in which we map a custom domain error within an "),a("code",[t._v("ExecutionError")]),t._v(" to a meaningful error code.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ResponseValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ObjectValue\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sealed")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("trait")]),t._v(" ExampleAppEncodableError "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Throwable "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token 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This can be useful for deterministically "replaying" a query without executing any new requests.')]),t._v(" "),s("li",[s("code",[t._v("runLog")]),t._v(" runs the query and returns its result along with the cache containing a complete log of all requests executed and their results. This can be useful for logging or analysis of query execution.")]),t._v(" "),s("li",[s("code",[t._v("run")]),t._v(" runs the query and returns its result.")])]),t._v(" "),s("h2",{attrs:{id:"using-zquery-with-caliban"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#using-zquery-with-caliban"}},[t._v("#")]),t._v(" Using ZQuery with Caliban")]),t._v(" "),s("p",[t._v("To use "),s("code",[t._v("ZQuery")]),t._v(" with Caliban, you can simply include fields of type "),s("code",[t._v("ZQuery")]),t._v(" in your API definition.")]),t._v(" "),s("div",{staticClass:"language-scala extra-class"},[s("pre",{pre:!0,attrs:{class:"language-scala"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n users"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ZQuery"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Nothing")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" List"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("User"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n user"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UserArgs "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZQuery"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Nothing")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" User"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),s("p",[t._v("During the query execution, Caliban will merge all the requested fields that return a "),s("code",[t._v("ZQuery")]),t._v(" into a single "),s("code",[t._v("ZQuery")]),t._v(" and run it, so that all the possible optimizations are applied.")]),t._v(" "),s("p",[t._v("The "),s("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/tree/series/2.x/examples",target:"_blank",rel:"noopener noreferrer"}},[t._v("examples"),s("OutboundLink")],1),t._v(" project provides 2 versions of the problem described in "),s("a",{attrs:{href:"https://blog.apollographql.com/optimizing-your-graphql-request-waterfalls-7c3f3360b051",target:"_blank",rel:"noopener noreferrer"}},[t._v("this article about GraphQL query optimization"),s("OutboundLink")],1),t._v(":")]),t._v(" "),s("ul",[s("li",[t._v("a "),s("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/tree/series/2.x/examples/src/main/scala/example/optimizations/NaiveTest.scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("naive"),s("OutboundLink")],1),t._v(" version where fields are just returning "),s("code",[t._v("IO")]),t._v(", resulting in 47 requests")]),t._v(" "),s("li",[t._v("an "),s("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/tree/series/2.x/examples/src/main/scala/example/optimizations/OptimizedTest.scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("optimized"),s("OutboundLink")],1),t._v(" version where fields are returning "),s("code",[t._v("ZQuery")]),t._v(", resulting in 8 requests only")])]),t._v(" "),s("div",{staticClass:"custom-block tip"},[s("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),s("p",[s("code",[t._v("ZQuery")]),t._v(" has a lot of operators that are similar to "),s("code",[t._v("ZIO")]),t._v(", such as "),s("code",[t._v(".optional")]),t._v(", etc.\nNote that just like "),s("code",[t._v("ZIO")]),t._v(", a field returning a "),s("code",[t._v("ZQuery")]),t._v(" will be executed only when it is requested by the client.")])]),t._v(" "),s("div",{staticClass:"custom-block tip"},[s("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),s("p",[t._v("When all your effects are wrapped with "),s("code",[t._v("ZQuery.fromRequest")]),t._v(", it is recommended to use "),s("code",[t._v("queryExecution = QueryExecution.Batched")]),t._v(" instead of the default "),s("code",[t._v("QueryExecution.Parallel")]),t._v(".\nDoing so will provide better performance as it will avoid forking unnecessary fibers.\nThis setting is available in "),s("code",[t._v("executeRequest")]),t._v(" as well as all the adapters.")])]),t._v(" "),s("h2",{attrs:{id:"using-field-metadata"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#using-field-metadata"}},[t._v("#")]),t._v(" Using field metadata")]),t._v(" "),s("p",[t._v("To reference field metadata in your queries you can simply use a function that takes the "),s("code",[t._v("caliban.execution.Field")]),t._v(" type in your queries.")]),t._v(" "),s("div",{staticClass:"language-scala extra-class"},[s("pre",{pre:!0,attrs:{class:"language-scala"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" User"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" expensiveOperation"),s("span",{pre:!0,attrs:{class:"token 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client to load faster by prioritizing the loading of the more important data first.")]),t._v(" "),s("p",[t._v("The client is able to submit a query that looks like this:")]),t._v(" "),s("div",{staticClass:"language-graphql extra-class"},[s("pre",{pre:!0,attrs:{class:"language-graphql"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("query")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token object"}},[t._v("characters")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token property"}},[t._v("name")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token property"}},[t._v("nicknames")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@defer")]),s("span",{pre:!0,attrs:{class:"token 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This is because it can substantially\nincrease the runtime cost of a query. To enable this feature you must explicitly opt-in to it.\nYou do this by adding the "),s("code",[t._v("@@ DeferSupport.defer")]),t._v(" aspect to your graph definition. This will inform the executor\nthat it may process queries that contain defer and will add the "),s("code",[t._v("@defer")]),t._v(" directive as a supported directive in the schema.")]),t._v(" "),s("p",[t._v("Additionally, you must make sure that your client is able to handle deferred responses. This requires special support from the client\nbecause the response will be streamed to the client in multiple parts instead of as a single json body.")]),t._v(" "),s("div",{staticClass:"custom-block tip"},[s("p",{staticClass:"custom-block-title"},[t._v("TIP")]),t._v(" "),s("p",[t._v("This optimization is completely optional from the server-side, the client shouldn't rely on any particular query splitting strategy as the server\nwill try to optimize the query to reduce performance penalties. For instance, if you defer a pure field (i.e. a field that doesn't require any effect) the server\nmay decide it is cheaper to simply return that as part of the main response instead of splitting it.")])]),t._v(" "),s("p",[t._v("Note: We highly recommend that you use one of the provided adapters when using this feature. These come with built-in support\nfor defer and will automatically unwrap the result of the query correctly. If you are writing your own adapter you will need to\nmanually handle the streaming result returned from the executor.")])])}),[],!1,null,null,null);s.default=n.exports}}]); \ No newline at end of file diff --git a/docs/assets/js/34.2b681510.js b/docs/assets/js/34.2f96ecde.js similarity index 99% rename from docs/assets/js/34.2b681510.js rename to docs/assets/js/34.2f96ecde.js index 84710e2020..6ae0ad02f3 100644 --- a/docs/assets/js/34.2b681510.js +++ b/docs/assets/js/34.2f96ecde.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[34],{313:function(t,s,a){"use strict";a.r(s);var n=a(14),e=Object(n.a)({},(function(){var t=this,s=t._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[s("h1",{attrs:{id:"relay-connections"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#relay-connections"}},[t._v("#")]),t._v(" Relay Connections")]),t._v(" "),s("p",[t._v("The "),s("em",[t._v("GraphQL Cursors Connection Specification")]),t._v(" is an 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Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Mechanic")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" 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operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mechanic")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("_")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("Boolean")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If your type needs to be shared between multiple unions you can use the "),a("code",[t._v("@GQLValueType")]),t._v(" annotation to have caliban\nproxy to another type beyond the sealed trait.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("callSign"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sealed")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("trait")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Role "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Captain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("shipName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Engineer"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("specialty"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLValueType")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Proxy"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("pilot"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This will produce the following GraphQL Types:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Pilot")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("shipName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("specialty")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Pilot")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("callSign")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If you prefer an "),a("code",[t._v("Interface")]),t._v(" instead of a "),a("code",[t._v("Union")]),t._v(" type, add the "),a("code",[t._v("@GQLInterface")]),t._v(" annotation to your sealed trait.\nAn interface will be created with all the fields that are common to the case classes extending the sealed trait, as long as they return the same type.")]),t._v(" "),a("p",[t._v("If you prefer to have a "),a("code",[t._v("Union")]),t._v(" type instead of an "),a("code",[t._v("Enum")]),t._v(", even when the sealed trait contains only objects, add the "),a("code",[t._v("@GQLUnion")]),t._v(" annotation.")]),t._v(" "),a("h2",{attrs:{id:"case-classes-and-sealed-traits"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#case-classes-and-sealed-traits"}},[t._v("#")]),t._v(" Case classes and sealed traits")]),t._v(" "),a("p",[t._v("The transformation between Scala types and GraphQL types is handled by a typeclass named "),a("code",[t._v("Schema")]),t._v(". As mentioned earlier, Caliban provides instances of "),a("code",[t._v("Schema")]),t._v(" for all basic Scala types, but inevitably you will need to support your own types, in particular case classes and sealed traits.")]),t._v(" "),a("p",[t._v("Caliban is able to generate instances of "),a("code",[t._v("Schema")]),t._v(" for case classes and sealed traits. You have two choices for doing that: auto derivation and semi-auto derivation.")]),t._v(" "),a("h3",{attrs:{id:"auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#auto-derivation"}},[t._v("#")]),t._v(" Auto derivation")]),t._v(" "),a("p",[t._v("Auto derivation is achieved easily by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Using this import, Caliban will generate "),a("code",[t._v("Schema")]),t._v(" instances for all the case classes and sealed traits that are found inside your resolver.")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Limitations")]),t._v(" "),a("p",[t._v("Auto derivation is the easiest way to get started, but it has some drawbacks:")]),t._v(" "),a("ul",[a("li",[t._v("If a type is referenced in several places inside your resolver, a "),a("code",[t._v("Schema")]),t._v(" will be generated for each occurrence, which can lead to longer compilation times and a high amount of generated code (a sign of this is that the compiler will suggest increasing "),a("code",[t._v("-Xmax-inlines")]),t._v(" in Scala 3).")]),t._v(" "),a("li",[t._v("When a "),a("code",[t._v("Schema")]),t._v(" is missing for a nested type inside your resolver, it can sometimes be difficult to find out which type is missing when using auto derivation, because the error message will mention the root type and not the nested one.")]),t._v(" "),a("li",[t._v("The macro that generates the "),a("code",[t._v("Schema")]),t._v(" instances sometimes gets confused when there are a lot of nested or recursive types, and can mistakenly generate a "),a("code",[t._v("Schema")]),t._v(" for types that already have a "),a("code",[t._v("Schema")]),t._v(" in scope. For this reason, semi-auto derivation is recommended for non-trivial schemas.")])])]),t._v(" "),a("h3",{attrs:{id:"semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#semi-auto-derivation"}},[t._v("#")]),t._v(" Semi-auto derivation")]),t._v(" "),a("p",[t._v("Semi-auto derivation is achieved as follows for each type that needs a "),a("code",[t._v("Schema")]),t._v(" instance ("),a("code",[t._v("MyClass")]),t._v(" in the example):")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaForMyClass"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you don't want to use the `derives` syntax, you can also use the following:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])])],1),t._v(" "),a("p",[t._v("In Scala 3, derivation doesn't support value classes and opaque types. You can use "),a("code",[t._v("Schema.genDebug")]),t._v(" to print the generated code in the console.")]),t._v(" "),a("h3",{attrs:{id:"combining-auto-and-semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#combining-auto-and-semi-auto-derivation"}},[t._v("#")]),t._v(" Combining auto and semi-auto derivation")]),t._v(" "),a("p",[t._v("For some types such as enums, it might be desirable to use auto derivation to reduce boilerplate schema definitions:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sealed")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("trait")]),t._v(" Origin\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Origin "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" EARTH "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Origin\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" MARS "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Origin\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" BELT "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Origin\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaForMyClass"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3 (Any schema)"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("enum")]),t._v(" Origin "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token 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keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" EnvSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("derived\n")])])])])],1),t._v(" "),a("h3",{attrs:{id:"deriving-fields-from-case-class-methods-scala-3-only"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#deriving-fields-from-case-class-methods-scala-3-only"}},[t._v("#")]),t._v(" Deriving fields from case class methods (Scala 3 only)")]),t._v(" "),a("p",[t._v("In certain cases, your type might contain fields whose value depends on other fields. For example, you might have a "),a("code",[t._v("Person")]),t._v(" type with a "),a("code",[t._v("fullName")]),t._v(" field that is derived from the "),a("code",[t._v("firstName")]),t._v(" and "),a("code",[t._v("lastName")]),t._v(" fields. In this case, you can use the "),a("code",[t._v("@GQLField")]),t._v(" annotation to indicate that the field should be derived from the method with the same name.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Annotations"),a("span",{pre:!0,attrs:{class:"token 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expression"}},[t._v("lastName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This case class will generate the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Person")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("firstName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("lastName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("fullName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The methods annotated with "),a("code",[t._v("@GQLField")]),t._v(" can return any type for which a "),a("code",[t._v("Schema")]),t._v(" is defined for, including effects such as "),a("code",[t._v("ZIO")]),t._v(" and "),a("code",[t._v("ZQuery")]),t._v(".\nIn addition, you can use any other annotation that is supported for case class arguments, such as 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If you need to derive a field that requires arguments, you can return a function instead.")]),t._v(" "),a("li",[t._v("The method must be public (i.e. not "),a("code",[t._v("private")]),t._v(" or "),a("code",[t._v("protected")]),t._v(").")]),t._v(" "),a("li",[t._v("It currently only works with methods (i.e., "),a("code",[t._v("def")]),t._v("). If you need to cache the output of the method, you can create a private lazy val and return it from the method.")]),t._v(" "),a("li",[t._v("It is not compatible with ahead-of-time compilation (e.g., generating a GraalVM native-image executable).")])])]),t._v(" "),a("h2",{attrs:{id:"arguments"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#arguments"}},[t._v("#")]),t._v(" Arguments")]),t._v(" "),a("p",[t._v("To declare a field that take arguments, create a dedicated case class representing the arguments and make the field a "),a("em",[t._v("function")]),t._v(" from this class to the result type.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FilterArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FilterArgs "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Queries")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(" that defines how incoming arguments from that types should be extracted. You also need a "),a("code",[t._v("Schema")]),t._v(" for those types.")]),t._v(" "),a("p",[t._v("Derivation of "),a("code",[t._v("ArgBuilder")]),t._v(" for case classes works similarly to "),a("code",[t._v("Schema")]),t._v(" derivation. You can use auto derivation by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Or you can use semi-auto derivation as follows:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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If you have multiple arguments, use a case class containing all of them instead of a tuple.")])]),t._v(" "),a("h2",{attrs:{id:"custom-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#custom-types"}},[t._v("#")]),t._v(" Custom types")]),t._v(" "),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("Schema")]),t._v(". Note that you don't have to do this if your types are just case classes composed of common types.")]),t._v(" "),a("p",[t._v("An easy way to do this is to reuse existing instances and use "),a("code",[t._v("contramap")]),t._v(" to map from your type to the original type. 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This allows you to leverage all the features provided by ZIO: timeouts, retries, access to ZIO environment, memoizing, etc. An effect will be run every time a query requiring the corresponding field is executed.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Task"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" RIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Console"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you don't use ZIO environment ("),a("code",[t._v("R")]),t._v(" = "),a("code",[t._v("Any")]),t._v("), there is nothing special to do to get it working.")]),t._v(" "),a("p",[t._v("If you require a ZIO environment and use Scala 2, you can't use "),a("code",[t._v("Schema.gen")]),t._v(" or the import we saw previously because they expect "),a("code",[t._v("R")]),t._v(" to be "),a("code",[t._v("Any")]),t._v(". Instead, you need to make a new object that extends "),a("code",[t._v("caliban.schema.GenericSchema[R]")]),t._v(" for your custom "),a("code",[t._v("R")]),t._v(". Then you can use "),a("code",[t._v("gen")]),t._v(" or "),a("code",[t._v("auto")]),t._v(" from that object to generate your schema.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" MyEnv "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Console \n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" customSchema "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" GenericSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("customSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you use semi-auto generation, use this instead:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val characterSchema: Schema[MyEnv, Character] = customSchema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = customSchema.gen")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you require a ZIO environment and use Scala 3, things are simpler since you don't need "),a("code",[t._v("GenericSchema")]),t._v(". Just make sure to use "),a("code",[t._v("Schema.gen")]),t._v(" with the proper R type parameter.\nTo make sure Caliban uses the proper environment, you need to specify it explicitly to "),a("code",[t._v("graphQL(...)")]),t._v(", unless you already have "),a("code",[t._v("Schema")]),t._v(" instances for your root operations in scope.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// or")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = Schema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// val api = graphQL(RootResolver(queries)) // it will infer MyEnv thanks to the instance above")]),t._v("\n")])])]),a("h2",{attrs:{id:"subscriptions"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#subscriptions"}},[t._v("#")]),t._v(" Subscriptions")]),t._v(" "),a("p",[t._v("All the fields of the subscription root case class MUST return "),a("code",[t._v("ZStream")]),t._v(" or "),a("code",[t._v("? => ZStream")]),t._v(" objects.")]),t._v(" "),a("p",[t._v("The "),a("RouterLink",{attrs:{to:"/docs/interop.html"}},[t._v("cats and monix interop modules")]),t._v(" also let you use fs2 "),a("code",[t._v("Stream")]),t._v(" and monix "),a("code",[t._v("Observable")]),t._v(" respectively.")],1),t._v(" "),a("h2",{attrs:{id:"annotations"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#annotations"}},[t._v("#")]),t._v(" Annotations")]),t._v(" "),a("p",[t._v("Caliban supports a few annotations to enrich data types:")]),t._v(" "),a("ul",[a("li",[a("code",[t._v('@GQLName("name")')]),t._v(" allows you to specify a different name for a data type or a field.")]),t._v(" "),a("li",[a("code",[t._v('@GQLInputName("name")')]),t._v(" allows you to specify a different name for a data type used as an input (by default, the suffix "),a("code",[t._v("Input")]),t._v(" is appended to the type name).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDescription("description")')]),t._v(" lets you provide a description for a data type or field. This description will be visible when your schema is introspected.")]),t._v(" "),a("li",[a("code",[t._v('@GQLDeprecated("reason")')]),t._v(" allows deprecating a field or an enum value.")]),t._v(" "),a("li",[a("code",[t._v("@GQLExcluded")]),t._v(" allows you to hide a field from the generated schema.")]),t._v(" "),a("li",[a("code",[t._v("@GQLInterface")]),t._v(" to force a sealed trait generating an interface instead of a union.")]),t._v(" "),a("li",[a("code",[t._v("@GQLDirective(directive: Directive)")]),t._v(" to add a directive to a field or type.")]),t._v(" "),a("li",[a("code",[t._v("@GQLValueType(isScalar)")]),t._v(" forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If "),a("code",[t._v("isScalar")]),t._v(" is true, it will generate a scalar named after the case class (default: false).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDefault("defaultValue")')]),t._v(" allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.")])]),t._v(" "),a("h2",{attrs:{id:"java-8-time-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#java-8-time-types"}},[t._v("#")]),t._v(" Java 8 Time types")]),t._v(" "),a("p",[t._v("Caliban provides implicit "),a("code",[t._v("Schema")]),t._v(" types for the standard "),a("code",[t._v("java.time")]),t._v(" types, by default these will use the\nISO standard strings for serialization and deserialization. However, you can customize this behavior by using\nexplicit constructor available under the "),a("code",[t._v("ArgBuilder")]),t._v(" companion object. For instance, you can specify an "),a("code",[t._v("instantEpoch")]),t._v("\nto handle instants which are encoded using a "),a("code",[t._v("Long")]),t._v(" from the standard java epoch time (January 1st 1970 00:00:00).\nFor some time formats you can also specify a specific "),a("code",[t._v("DateTimeFormatter")]),t._v(" to handle your particular date time needs.")]),t._v(" "),a("h2",{attrs:{id:"building-schemas-by-hand"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#building-schemas-by-hand"}},[t._v("#")]),t._v(" Building Schemas by hand")]),t._v(" "),a("p",[t._v("Sometimes for whatever reason schema generation fails. This can happen if your schema has co-recursive types and derivation is unable\nto generate a schema for them. In cases like these you may need to instead create your own schema by hand.")]),t._v(" "),a("p",[t._v("Consider the case where you have three types which create cyclical dependencies on one another")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("UIO\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" users"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" parent"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" organization"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" groups"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" group"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("These three types all depend on one another and if you attempt to generate a schema from them you will either end up with compiler errors or you will end up with a nasty runtime\nerror from a "),a("code",[t._v("NullPointerException")]),t._v(". To help the compiler out we can hand generate the types for these case classes instead.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token 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"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Engineer"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("specialty"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Mechanic "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Mechanic")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("shipName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("specialty")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mechanic")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("_")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("Boolean")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If your type needs to be shared between multiple unions you can use the "),a("code",[t._v("@GQLValueType")]),t._v(" annotation to have caliban\nproxy to another type beyond the sealed trait.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("callSign"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("sealed")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("trait")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Role "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Captain"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("shipName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Engineer"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("specialty"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLValueType")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Proxy"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("pilot"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Pilot"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" Role\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This will produce the following GraphQL Types:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("union")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Role")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token property"}},[t._v("Pilot")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Captain")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("shipName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Engineer")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("specialty")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Pilot")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("callSign")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("If you prefer an "),a("code",[t._v("Interface")]),t._v(" instead of a "),a("code",[t._v("Union")]),t._v(" type, add the "),a("code",[t._v("@GQLInterface")]),t._v(" annotation to your sealed trait.\nAn interface will be created with all the fields that are common to the case classes extending the sealed trait, as long as they return the same type.")]),t._v(" "),a("p",[t._v("If you prefer to have a "),a("code",[t._v("Union")]),t._v(" type instead of an "),a("code",[t._v("Enum")]),t._v(", even when the sealed trait contains only objects, add the "),a("code",[t._v("@GQLUnion")]),t._v(" annotation.")]),t._v(" "),a("h2",{attrs:{id:"case-classes-and-sealed-traits"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#case-classes-and-sealed-traits"}},[t._v("#")]),t._v(" Case classes and sealed traits")]),t._v(" "),a("p",[t._v("The transformation between Scala types and GraphQL types is handled by a typeclass named "),a("code",[t._v("Schema")]),t._v(". As mentioned earlier, Caliban provides instances of "),a("code",[t._v("Schema")]),t._v(" for all basic Scala types, but inevitably you will need to support your own types, in particular case classes and sealed traits.")]),t._v(" "),a("p",[t._v("Caliban is able to generate instances of "),a("code",[t._v("Schema")]),t._v(" for case classes and sealed traits. You have two choices for doing that: auto derivation and semi-auto derivation.")]),t._v(" "),a("h3",{attrs:{id:"auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#auto-derivation"}},[t._v("#")]),t._v(" Auto derivation")]),t._v(" "),a("p",[t._v("Auto derivation is achieved easily by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Using this import, Caliban will generate "),a("code",[t._v("Schema")]),t._v(" instances for all the case classes and sealed traits that are found inside your resolver.")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Limitations")]),t._v(" "),a("p",[t._v("Auto derivation is the easiest way to get started, but it has some drawbacks:")]),t._v(" "),a("ul",[a("li",[t._v("If a type is referenced in several places inside your resolver, a "),a("code",[t._v("Schema")]),t._v(" will be generated for each occurrence, which can lead to longer compilation times and a high amount of generated code (a sign of this is that the compiler will suggest increasing "),a("code",[t._v("-Xmax-inlines")]),t._v(" in Scala 3).")]),t._v(" "),a("li",[t._v("When a "),a("code",[t._v("Schema")]),t._v(" is missing for a nested type inside your resolver, it can sometimes be difficult to find out which type is missing when using auto derivation, because the error message will mention the root type and not the nested one.")]),t._v(" "),a("li",[t._v("The macro that generates the "),a("code",[t._v("Schema")]),t._v(" instances sometimes gets confused when there are a lot of nested or recursive types, and can mistakenly generate a "),a("code",[t._v("Schema")]),t._v(" for types that already have a "),a("code",[t._v("Schema")]),t._v(" in scope. For this reason, semi-auto derivation is recommended for non-trivial schemas.")])])]),t._v(" "),a("h3",{attrs:{id:"semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#semi-auto-derivation"}},[t._v("#")]),t._v(" Semi-auto derivation")]),t._v(" "),a("p",[t._v("Semi-auto derivation is achieved as follows for each type that needs a "),a("code",[t._v("Schema")]),t._v(" instance ("),a("code",[t._v("MyClass")]),t._v(" in the example):")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaForMyClass"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])]),t._v(" "),a("code-block",{attrs:{title:"Scala 3"}},[a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("field"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you don't want to use the `derives` syntax, you can also use the following:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyClass"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])])])],1),t._v(" "),a("p",[t._v("In Scala 3, derivation doesn't support value classes and opaque types. You can use "),a("code",[t._v("Schema.genDebug")]),t._v(" to print the generated code in the console.")]),t._v(" "),a("h3",{attrs:{id:"combining-auto-and-semi-auto-derivation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#combining-auto-and-semi-auto-derivation"}},[t._v("#")]),t._v(" Combining auto and semi-auto derivation")]),t._v(" "),a("p",[t._v("For some types such as enums, it might be desirable to use auto derivation to reduce boilerplate schema definitions:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token 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syntax:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("given")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" EnvSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("derived\n")])])])])],1),t._v(" "),a("h3",{attrs:{id:"deriving-fields-from-case-class-methods-scala-3-only"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#deriving-fields-from-case-class-methods-scala-3-only"}},[t._v("#")]),t._v(" Deriving fields from case class methods (Scala 3 only)")]),t._v(" "),a("p",[t._v("In certain cases, your type might contain fields whose value depends on other fields. For example, you might have a "),a("code",[t._v("Person")]),t._v(" type with a "),a("code",[t._v("fullName")]),t._v(" field that is derived from the "),a("code",[t._v("firstName")]),t._v(" and "),a("code",[t._v("lastName")]),t._v(" fields. In this case, you can use the "),a("code",[t._v("@GQLField")]),t._v(" annotation to indicate that the field should be derived from the method with the same name.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Annotations"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("GQLField\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Person"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n firstName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n lastName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("derives")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("SemiAuto "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token annotation punctuation"}},[t._v("@GQLField")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" fullName"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string-interpolation"}},[a("span",{pre:!0,attrs:{class:"token id function"}},[t._v("s")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("firstName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v(" ")]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("lastName")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("This case class will generate the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Person")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("firstName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("lastName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("fullName")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("The methods annotated with "),a("code",[t._v("@GQLField")]),t._v(" can return any type for which a "),a("code",[t._v("Schema")]),t._v(" is defined for, including effects such as "),a("code",[t._v("ZIO")]),t._v(" and "),a("code",[t._v("ZQuery")]),t._v(".\nIn addition, you can use any other annotation that is supported for case class arguments, such as "),a("code",[t._v("@GQLName")]),t._v(", "),a("code",[t._v("@GQLDescription")]),t._v(" and "),a("code",[t._v("@GQLDeprecated")]),t._v(".")]),t._v(" "),a("div",{staticClass:"custom-block warning"},[a("p",{staticClass:"custom-block-title"},[t._v("Caveats")]),t._v(" "),a("p",[t._v("Derivation of fields via the "),a("code",[t._v("@GQLField")]),t._v(" annotation can be convenient in certain cases, but has the following limitations:")]),t._v(" "),a("ul",[a("li",[t._v("The method cannot take arguments. If you need to derive a field that requires arguments, you can return a function instead.")]),t._v(" "),a("li",[t._v("The method must be public (i.e. not "),a("code",[t._v("private")]),t._v(" or "),a("code",[t._v("protected")]),t._v(").")]),t._v(" "),a("li",[t._v("It currently only works with methods (i.e., "),a("code",[t._v("def")]),t._v("). If you need to cache the output of the method, you can create a private lazy val and return it from the method.")]),t._v(" "),a("li",[t._v("It is not compatible with ahead-of-time compilation (e.g., generating a GraalVM native-image executable).")])])]),t._v(" "),a("h2",{attrs:{id:"arguments"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#arguments"}},[t._v("#")]),t._v(" Arguments")]),t._v(" "),a("p",[t._v("To declare a field that take arguments, create a dedicated case class representing the arguments and make the field a "),a("em",[t._v("function")]),t._v(" from this class to the result type.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FilterArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("origin"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Origin"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FilterArgs "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("The snippet above will produce the following GraphQL type:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Queries")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("characters")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Origin")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Character")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(" that defines how incoming arguments from that types should be extracted. You also need a "),a("code",[t._v("Schema")]),t._v(" for those types.")]),t._v(" "),a("p",[t._v("Derivation of "),a("code",[t._v("ArgBuilder")]),t._v(" for case classes works similarly to "),a("code",[t._v("Schema")]),t._v(" derivation. You can use auto derivation by adding the following import:")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("_\n")])])]),a("p",[t._v("Or you can use semi-auto derivation as follows:")]),t._v(" "),a("code-group",[a("code-block",{attrs:{title:"Scala 2",active:""}},[a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token 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If you have multiple arguments, use a case class containing all of them instead of a tuple.")])]),t._v(" "),a("h2",{attrs:{id:"custom-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#custom-types"}},[t._v("#")]),t._v(" Custom types")]),t._v(" "),a("p",[t._v("Caliban provides auto-derivation for common types such as "),a("code",[t._v("Int")]),t._v(", "),a("code",[t._v("String")]),t._v(", "),a("code",[t._v("List")]),t._v(", "),a("code",[t._v("Option")]),t._v(", etc. but you can also support your own types by providing an implicit instance of "),a("code",[t._v("Schema")]),t._v(". Note that you don't have to do this if your types are just case classes composed of common types.")]),t._v(" "),a("p",[t._v("An easy way to do this is to reuse existing instances and use "),a("code",[t._v("contramap")]),t._v(" to map from your type to the original type. Here's an example of creating an instance for "),a("a",{attrs:{href:"https://github.com/fthomas/refined",target:"_blank",rel:"noopener noreferrer"}},[t._v("refined"),a("OutboundLink")],1),t._v("'s "),a("code",[t._v("NonEmptyString")]),t._v(" reusing existing instance for "),a("code",[t._v("String")]),t._v(" (if you use "),a("code",[t._v("refined")]),t._v(", you might want to look at "),a("a",{attrs:{href:"https://github.com/niqdev/caliban-extras#caliban-refined",target:"_blank",rel:"noopener noreferrer"}},[t._v("caliban-refined"),a("OutboundLink")],1),t._v("):")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" nonEmptyStringSchema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" NonEmptyString"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" \n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("stringSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("contramap"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("You can also use the "),a("code",[t._v("scalarSchema")]),t._v(" helper to create your own scalar types, providing a name, an optional description, and a function from your type to a "),a("code",[t._v("ResponseValue")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("ResponseValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("ObjectValue\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" unitSchema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("scalarSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Unit"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ObjectValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("Nil"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you are using a custom type as part of the input you also have to provide an implicit instance of "),a("code",[t._v("ArgBuilder")]),t._v(". For example here's how to do that for "),a("code",[t._v("java.time.LocalDate")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("java"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("time"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("LocalDate\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("scala"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("util"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Try\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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This allows you to leverage all the features provided by ZIO: timeouts, retries, access to ZIO environment, memoizing, etc. An effect will be run every time a query requiring the corresponding field is executed.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent:reset extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("characters"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Task"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n character"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" CharacterName "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" RIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Console"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Character"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you don't use ZIO environment ("),a("code",[t._v("R")]),t._v(" = "),a("code",[t._v("Any")]),t._v("), there is nothing special to do to get it working.")]),t._v(" "),a("p",[t._v("If you require a ZIO environment and use Scala 2, you can't use "),a("code",[t._v("Schema.gen")]),t._v(" or the import we saw previously because they expect "),a("code",[t._v("R")]),t._v(" to be "),a("code",[t._v("Any")]),t._v(". Instead, you need to make a new object that extends "),a("code",[t._v("caliban.schema.GenericSchema[R]")]),t._v(" for your custom "),a("code",[t._v("R")]),t._v(". Then you can use "),a("code",[t._v("gen")]),t._v(" or "),a("code",[t._v("auto")]),t._v(" from that object to generate your schema.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" MyEnv "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Console \n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" customSchema "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" GenericSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("customSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("auto"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("_\n\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// if you use semi-auto generation, use this instead:")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val characterSchema: Schema[MyEnv, Character] = customSchema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = customSchema.gen")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("If you require a ZIO environment and use Scala 3, things are simpler since you don't need "),a("code",[t._v("GenericSchema")]),t._v(". Just make sure to use "),a("code",[t._v("Schema.gen")]),t._v(" with the proper R type parameter.\nTo make sure Caliban uses the proper environment, you need to specify it explicitly to "),a("code",[t._v("graphQL(...)")]),t._v(", unless you already have "),a("code",[t._v("Schema")]),t._v(" instances for your root operations in scope.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" queries "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("attempt"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" _ "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ZIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("succeed"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("?")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("MyEnv"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Unit")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("RootResolver"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("queries"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// or")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// implicit val queriesSchema: Schema[MyEnv, Queries] = Schema.gen")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// val api = graphQL(RootResolver(queries)) // it will infer MyEnv thanks to the instance above")]),t._v("\n")])])]),a("h2",{attrs:{id:"subscriptions"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#subscriptions"}},[t._v("#")]),t._v(" Subscriptions")]),t._v(" "),a("p",[t._v("All the fields of the subscription root case class MUST return "),a("code",[t._v("ZStream")]),t._v(" or "),a("code",[t._v("? => ZStream")]),t._v(" objects.")]),t._v(" "),a("p",[t._v("The "),a("RouterLink",{attrs:{to:"/docs/interop.html"}},[t._v("cats and monix interop modules")]),t._v(" also let you use fs2 "),a("code",[t._v("Stream")]),t._v(" and monix "),a("code",[t._v("Observable")]),t._v(" respectively.")],1),t._v(" "),a("h2",{attrs:{id:"annotations"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#annotations"}},[t._v("#")]),t._v(" Annotations")]),t._v(" "),a("p",[t._v("Caliban supports a few annotations to enrich data types:")]),t._v(" "),a("ul",[a("li",[a("code",[t._v('@GQLName("name")')]),t._v(" allows you to specify a different name for a data type or a field.")]),t._v(" "),a("li",[a("code",[t._v('@GQLInputName("name")')]),t._v(" allows you to specify a different name for a data type used as an input (by default, the suffix "),a("code",[t._v("Input")]),t._v(" is appended to the type name).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDescription("description")')]),t._v(" lets you provide a description for a data type or field. This description will be visible when your schema is introspected.")]),t._v(" "),a("li",[a("code",[t._v('@GQLDeprecated("reason")')]),t._v(" allows deprecating a field or an enum value.")]),t._v(" "),a("li",[a("code",[t._v("@GQLExcluded")]),t._v(" allows you to hide a field from the generated schema.")]),t._v(" "),a("li",[a("code",[t._v("@GQLInterface")]),t._v(" to force a sealed trait generating an interface instead of a union.")]),t._v(" "),a("li",[a("code",[t._v("@GQLDirective(directive: Directive)")]),t._v(" to add a directive to a field or type.")]),t._v(" "),a("li",[a("code",[t._v("@GQLValueType(isScalar)")]),t._v(" forces a type to behave as a value type for derivation. Meaning that caliban will ignore the outer type and take the first case class parameter as the real type. If "),a("code",[t._v("isScalar")]),t._v(" is true, it will generate a scalar named after the case class (default: false).")]),t._v(" "),a("li",[a("code",[t._v('@GQLDefault("defaultValue")')]),t._v(" allows you to specify a default value for an input field using GraphQL syntax. The default value will be visible in your schema's SDL and during introspection.")])]),t._v(" "),a("h2",{attrs:{id:"java-8-time-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#java-8-time-types"}},[t._v("#")]),t._v(" Java 8 Time types")]),t._v(" "),a("p",[t._v("Caliban provides implicit "),a("code",[t._v("Schema")]),t._v(" types for the standard "),a("code",[t._v("java.time")]),t._v(" types, by default these will use the\nISO standard strings for serialization and deserialization. However, you can customize this behavior by using\nexplicit constructor available under the "),a("code",[t._v("ArgBuilder")]),t._v(" companion object. For instance, you can specify an "),a("code",[t._v("instantEpoch")]),t._v("\nto handle instants which are encoded using a "),a("code",[t._v("Long")]),t._v(" from the standard java epoch time (January 1st 1970 00:00:00).\nFor some time formats you can also specify a specific "),a("code",[t._v("DateTimeFormatter")]),t._v(" to handle your particular date time needs.")]),t._v(" "),a("h2",{attrs:{id:"building-schemas-by-hand"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#building-schemas-by-hand"}},[t._v("#")]),t._v(" Building Schemas by hand")]),t._v(" "),a("p",[t._v("Sometimes for whatever reason schema generation fails. This can happen if your schema has co-recursive types and derivation is unable\nto generate a schema for them. In cases like these you may need to instead create your own schema by hand.")]),t._v(" "),a("p",[t._v("Consider the case where you have three types which create cyclical dependencies on one another")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("UIO\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" users"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" parent"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Option"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" organization"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Organization"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" groups"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("List"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" User"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" group"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Group"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("These three types all depend on one another and if you attempt to generate a schema from them you will either end up with compiler errors or you will end up with a nasty runtime\nerror from a "),a("code",[t._v("NullPointerException")]),t._v(". To help the compiler out we can hand generate the types for these case classes instead.")]),t._v(" "),a("div",{staticClass:"language-scala mdoc:silent extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token namespace"}},[t._v("caliban"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")])]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token 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Default: "),a("code",[t._v(".scalafmt.conf")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("headers")]),t._v(": Provides request headers when "),a("code",[t._v("schemaPath")]),t._v(" is a URL.")]),t._v(" "),a("li",[a("code",[t._v("packageName")]),t._v(": Overrides the package name derived from the folder of "),a("code",[t._v("outputPath")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("effect")]),t._v(": Overrides the default effect ("),a("code",[t._v("zio.UIO")]),t._v(") for wrapping fields in Queries and Mutations.")]),t._v(" "),a("li",[a("code",[t._v("scalarMappings")]),t._v(": Forces a mapping between a GraphQL type and a Scala class (e.g., scalars).")]),t._v(" "),a("li",[a("code",[t._v("imports")]),t._v(": Adds additional imports to the generated code.")]),t._v(" "),a("li",[a("code",[t._v("abstractEffectType")]),t._v(": Indicates that the effect type is abstract. Fields in Queries and Mutations will return "),a("code",[t._v("F[_]")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("preserveInputNames")]),t._v(": Disables the default behavior of appending "),a("code",[t._v("Input")]),t._v(" to the type name of input types in the derived schema.")]),t._v(" "),a("li",[a("code",[t._v("addDerives")]),t._v(": Adds "),a("code",[t._v("derives")]),t._v(" clauses for type class instance derivation in Scala 3.")]),t._v(" "),a("li",[a("code",[t._v("envForDerives")]),t._v(": Specifies the type alias for your ZIO Environment when using "),a("code",[t._v("derives")]),t._v(" and a ZIO Environment other than "),a("code",[t._v("Any")]),t._v(".")])]),t._v(" "),a("h2",{attrs:{id:"lazy-evaluation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#lazy-evaluation"}},[t._v("#")]),t._v(" Lazy evaluation")]),t._v(" "),a("p",[t._v("The main difference between generating code for client usage and for server usage is that on the server you need to account for\ncode which should only be evaluated if the client requests the field!")]),t._v(" "),a("p",[t._v("You can annotate this directly in the graphql schema by creating a "),a("code",[t._v("@lazy")]),t._v(" directive.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n")])])]),a("p",[t._v("You can then annotate fields in the graphql schema like this:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("MyType")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myLazyField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("And you'll get a case class which looks something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("myLazyField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" myField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("When implementing this, "),a("code",[t._v("myLazyField")]),t._v(" will only be evaluated if the client requested it in the query")]),t._v(" "),a("h2",{attrs:{id:"newtype-declaration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#newtype-declaration"}},[t._v("#")]),t._v(" Newtype declaration")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("@newtype")]),t._v(" directive in caliban allows you to wrap your GraphQL fields into statically\ntyped IDs for backend. For clients, they can use the GraphQL as before and do not\nhave to adjust their typing, or optionally can generate stronger typed IDs using\nthe directive.")]),t._v(" "),a("p",[t._v("In the following example we want to encapsulate "),a("code",[t._v("id : ID")]),t._v(" as FooId for better type safety, so\nwe use the "),a("code",[t._v("@newtype")]),t._v(" directive on the "),a("code",[t._v("Query")]),t._v(" and Foo object type.\nOn mutation, we are passing an optional field of String. To avoid mixing with other String\ntypes in backend code we decided to create a "),a("code",[t._v("@newtype")]),t._v(" of Bar instead.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ARGUMENT_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("INPUT_FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token property-query"}},[t._v("getFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mutation")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("updateFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("foo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("input")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("maybeBar")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Bar"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("With Scalar mapping for ID set to Int, it would give you the following case classes.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n")])])]),a("p",[t._v("The "),a("code",[t._v("extends AnyVal")]),t._v(" ensures type erasure in such a way that we do not have to consider this abstraction\non client side, and hence graphql query remains the same as before applying the directive.\nBut for this to work we need to supply some implicit for our schema to understand the AnyVal\nconversion and mapping of the return values using "),a("code",[t._v("@GQLDirective")]),t._v(" annotation.")]),t._v(" "),a("p",[t._v("With this in place our generate type code should look something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Types "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" QueryGetFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MutationUpdateFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("foo"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooInput"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Bar "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token 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true\n")])])]),a("h2",{attrs:{id:"options"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#options"}},[t._v("#")]),t._v(" Options")]),t._v(" "),a("ul",[a("li",[a("code",[t._v("scalafmtPath")]),t._v(": Specifies the configuration file for Scalafmt. Default: "),a("code",[t._v(".scalafmt.conf")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("headers")]),t._v(": Provides request headers when "),a("code",[t._v("schemaPath")]),t._v(" is a URL.")]),t._v(" "),a("li",[a("code",[t._v("packageName")]),t._v(": Overrides the package name derived from the folder of "),a("code",[t._v("outputPath")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("effect")]),t._v(": Overrides the default effect ("),a("code",[t._v("zio.UIO")]),t._v(") for wrapping fields in Queries and Mutations.")]),t._v(" "),a("li",[a("code",[t._v("scalarMappings")]),t._v(": Forces a mapping between a GraphQL type and a Scala class (e.g., scalars).")]),t._v(" "),a("li",[a("code",[t._v("imports")]),t._v(": Adds additional imports to the generated code.")]),t._v(" "),a("li",[a("code",[t._v("abstractEffectType")]),t._v(": Indicates that the effect type is abstract. Fields in Queries and Mutations will return "),a("code",[t._v("F[_]")]),t._v(".")]),t._v(" "),a("li",[a("code",[t._v("preserveInputNames")]),t._v(": Disables the default behavior of appending "),a("code",[t._v("Input")]),t._v(" to the type name of input types in the derived schema.")]),t._v(" "),a("li",[a("code",[t._v("addDerives")]),t._v(": Adds "),a("code",[t._v("derives")]),t._v(" clauses for type class instance derivation in Scala 3.")]),t._v(" "),a("li",[a("code",[t._v("envForDerives")]),t._v(": Specifies the type alias for your ZIO Environment when using "),a("code",[t._v("derives")]),t._v(" and a ZIO Environment other than "),a("code",[t._v("Any")]),t._v(".")])]),t._v(" "),a("h2",{attrs:{id:"lazy-evaluation"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#lazy-evaluation"}},[t._v("#")]),t._v(" Lazy evaluation")]),t._v(" "),a("p",[t._v("The main difference between generating code for client usage and for server usage is that on the server you need to account for\ncode which should only be evaluated if the client requests the field!")]),t._v(" "),a("p",[t._v("You can annotate this directly in the graphql schema by creating a "),a("code",[t._v("@lazy")]),t._v(" directive.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n")])])]),a("p",[t._v("You can then annotate fields in the graphql schema like this:")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("MyType")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myLazyField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@lazy")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("myField")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("And you'll get a case class which looks something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("myLazyField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" zio"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("UIO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" myField"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("When implementing this, "),a("code",[t._v("myLazyField")]),t._v(" will only be evaluated if the client requested it in the query")]),t._v(" "),a("h2",{attrs:{id:"newtype-declaration"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#newtype-declaration"}},[t._v("#")]),t._v(" Newtype declaration")]),t._v(" "),a("p",[t._v("The "),a("code",[t._v("@newtype")]),t._v(" directive in caliban allows you to wrap your GraphQL fields into statically\ntyped IDs for backend. For clients, they can use the GraphQL as before and do not\nhave to adjust their typing, or optionally can generate stronger typed IDs using\nthe directive.")]),t._v(" "),a("p",[t._v("In the following example we want to encapsulate "),a("code",[t._v("id : ID")]),t._v(" as FooId for better type safety, so\nwe use the "),a("code",[t._v("@newtype")]),t._v(" directive on the "),a("code",[t._v("Query")]),t._v(" and Foo object type.\nOn mutation, we are passing an optional field of String. To avoid mixing with other String\ntypes in backend code we decided to create a "),a("code",[t._v("@newtype")]),t._v(" of Bar instead.")]),t._v(" "),a("div",{staticClass:"language-graphql extra-class"},[a("pre",{pre:!0,attrs:{class:"language-graphql"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("directive")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("on")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("FIELD_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("ARGUMENT_DEFINITION")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token constant"}},[t._v("INPUT_FIELD_DEFINITION")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Query")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token property-query"}},[t._v("getFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Mutation")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("updateFoo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("foo")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("type")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("Foo")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("id")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("ID")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"FooId"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("input")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token atom-input class-name"}},[t._v("FooInput")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("maybeBar")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token scalar"}},[t._v("String")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token directive function"}},[t._v("@newtype")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Bar"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("...")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("p",[t._v("With Scalar mapping for ID set to Int, it would give you the following case classes.")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n")])])]),a("p",[t._v("The "),a("code",[t._v("extends AnyVal")]),t._v(" ensures type erasure in such a way that we do not have to consider this abstraction\non client side, and hence graphql query remains the same as before applying the directive.\nBut for this to work we need to supply some implicit for our schema to understand the AnyVal\nconversion and mapping of the return values using "),a("code",[t._v("@GQLDirective")]),t._v(" annotation.")]),t._v(" "),a("p",[t._v("With this in place our generate type code should look something like this:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Types "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" QueryGetFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("id"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooId"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("final")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" MutationUpdateFooArgs"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("foo"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" FooInput"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n \n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("class")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("extends")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("AnyVal")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("object")]),t._v(" Bar "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schema"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("String")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("contramap"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("_"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" argBuilder"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" ArgBuilder"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("Bar"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" implicitly"),a("span",{pre:!0,attrs:{class:"token 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This effectively replaces our own schema with one from Github.")]),t._v(" "),s("li",[t._v("Teach our implicit schema how to map our local resolver to a query that can be resolved remotely by calling Github's API.")])]),t._v(" "),s("div",{staticClass:"language-scala extra-class"},[s("pre",{pre:!0,attrs:{class:"language-scala"}},[s("code",[t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" GITHUB_API "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string"}},[t._v('"https://api.github.com/graphql"')]),t._v("\n\n "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("for")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n sttpClient "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("<-")]),t._v(" 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This is because all queries to Github's API requires authorization to be provided. In order to fix this, we need to add authorization to both the introspection query as well as our remote resolver. 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"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),s("p",[t._v("Now let's integrate with the Github API!")]),t._v(" "),s("p",[t._v("In order to do this we're going to do a couple of things:")]),t._v(" "),s("ol",[s("li",[t._v("Load the introspection schema from Github's API")]),t._v(" "),s("li",[t._v("Parse the introspected schema into a "),s("code",[t._v("caliban.introspection.adt.__Schema")])]),t._v(" "),s("li",[t._v("Use the parsed schema to generate an "),s("code",[t._v("implicit Schema[R, A]")]),t._v(" for the entities we're stitching. 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\ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[40],{321:function(t,e,a){"use strict";a.r(e);var s=a(14),o=Object(s.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"getting-started"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#getting-started"}},[t._v("#")]),t._v(" Getting Started")]),t._v(" "),e("p",[t._v("Caliban comes with a module called "),e("code",[t._v("caliban-tools")]),t._v(" that exposes some useful features:")]),t._v(" "),e("ul",[e("li",[t._v("all the code generation features from "),e("code",[t._v("caliban-codegen-sbt")]),t._v(", so that you can use them without sbt: see "),e("code",[t._v("caliban.tools.Codegen")]),t._v(".")]),t._v(" "),e("li",[t._v("a client for GraphQL introspection: see "),e("code",[t._v("caliban.tools.IntrospectionClient")]),t._v(".")]),t._v(" "),e("li",[t._v("utilities for "),e("RouterLink",{attrs:{to:"/docs/stitching.html"}},[t._v("stitching GraphQL schemas")]),t._v(".")],1),t._v(" "),e("li",[t._v("a way to "),e("RouterLink",{attrs:{to:"/docs/schema-comparison.html"}},[t._v("compare GraphQL schemas")]),t._v(", whether they come from Caliban or a remote server.")],1)]),t._v(" "),e("h2",{attrs:{id:"dependency"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#dependency"}},[t._v("#")]),t._v(" Dependency")]),t._v(" "),e("div",{staticClass:"language-scala extra-class"},[e("pre",{pre:!0,attrs:{class:"language-scala"}},[e("code",[e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"com.github.ghostdogpr"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"caliban-tools"')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("%")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"2.6.0"')]),t._v("\n")])])])])}),[],!1,null,null,null);e.default=o.exports}}]); \ No newline at end of file diff --git a/docs/assets/js/41.edb7aaa2.js b/docs/assets/js/41.4f1c7015.js similarity index 99% rename from docs/assets/js/41.edb7aaa2.js rename to docs/assets/js/41.4f1c7015.js index 190dc21b81..0cc173797e 100644 --- a/docs/assets/js/41.edb7aaa2.js +++ b/docs/assets/js/41.4f1c7015.js @@ -1 +1 @@ -(window.webpackJsonp=window.webpackJsonp||[]).push([[41],{321:function(t,a,e){"use strict";e.r(a);var s=e(14),n=Object(s.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"faq"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#faq"}},[t._v("#")]),t._v(" FAQ")]),t._v(" "),a("h3",{attrs:{id:"i-don-t-know-where-to-start-😥"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-don-t-know-where-to-start-😥"}},[t._v("#")]),t._v(" I don't know where to start 😥")]),t._v(" "),a("p",[t._v("No worries! Head to the "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/resources/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Resources"),a("OutboundLink")],1),t._v(" page to find a few introductory videos and blog posts, in particular this "),a("a",{attrs:{href:"https://blog.pierre-ricadat.com/a-beginners-guide-to-graphql-in-scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("Beginner's Guide to GraphQL in Scala"),a("OutboundLink")],1),t._v(". Once you're ready for more details, check the "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Documentation"),a("OutboundLink")],1),t._v(". If you prefer looking at some code first, check "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/examples.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("this list of examples"),a("OutboundLink")],1),t._v(".")]),t._v(" "),a("p",[t._v("If you're still lost, just come to the "),a("a",{attrs:{href:"https://discord.gg/EYpumuv",target:"_blank",rel:"noopener noreferrer"}},[t._v("Discord channel"),a("OutboundLink")],1),t._v("!")]),t._v(" "),a("h3",{attrs:{id:"i-m-getting-a-compilation-error-saying-a-schema-is-missing-but-i-don-t-know-which-one"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-m-getting-a-compilation-error-saying-a-schema-is-missing-but-i-don-t-know-which-one"}},[t._v("#")]),t._v(" I'm getting a compilation error saying a "),a("code",[t._v("Schema")]),t._v(" is missing, but I don't know which one.")]),t._v(" "),a("p",[t._v("Call directly "),a("code",[t._v("Schema.gen[YourType]")]),t._v(" or just "),a("code",[t._v("gen[YourType]")]),t._v(" if you extend "),a("code",[t._v("GenericSchema")]),t._v(". The error should be more detailed.\nIt is also recommended to use semi-auto derivation instead of auto derivation, as it will tell you more clearly which type is missing a schema.")]),t._v(" "),a("h3",{attrs:{id:"i-want-to-use-caliban-but-i-use-cats-effect-monix-instead-of-zio"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-want-to-use-caliban-but-i-use-cats-effect-monix-instead-of-zio"}},[t._v("#")]),t._v(" I want to use Caliban, but I use Cats Effect / Monix instead of ZIO.")]),t._v(" "),a("p",[t._v('That\'s not a problem! Caliban has interop modules that "hide" the ZIO details and expose Cats Effect or Monix types instead. Check the '),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/interop.html#cats-effect",target:"_blank",rel:"noopener noreferrer"}},[t._v("interop docs"),a("OutboundLink")],1),t._v(" for more details.")]),t._v(" "),a("h3",{attrs:{id:"my-query-fails-with-an-effect-failure-error-how-can-i-get-more-details"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#my-query-fails-with-an-effect-failure-error-how-can-i-get-more-details"}},[t._v("#")]),t._v(' My query fails with an "Effect failure" error. How can I get more details?')]),t._v(" "),a("p",[t._v("When an error happens in one of the resolvers, Caliban doesn't expose the inner exception to the client by default (this might be unsafe to do so), but you can easily work around this by several ways:")]),t._v(" "),a("ol",[a("li",[t._v("If you fail with a "),a("code",[t._v("CalibanError.ExecutionError")]),t._v(", it won't be wrapped by Caliban so the original message will be displayed")]),t._v(" "),a("li",[t._v("Using the wrapper "),a("code",[t._v("@@ printErrors")]),t._v(" will print the full error to the console")]),t._v(" "),a("li",[t._v("Using "),a("code",[t._v("mapError")]),t._v(" on your interpreter lets you unwrap the "),a("code",[t._v("CalibanError")]),t._v(" and return your inner exception instead")])]),t._v(" "),a("h3",{attrs:{id:"i-have-more-than-22-fields-in-my-query-i-can-t-create-a-case-class-for-it"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-have-more-than-22-fields-in-my-query-i-can-t-create-a-case-class-for-it"}},[t._v("#")]),t._v(" I have more than 22 fields in my Query, I can't create a case class for it.")]),t._v(" "),a("p",[t._v("Instead of one huge case class with all your fields, you can create smaller case classes and combine "),a("code",[t._v("GraphQL")]),t._v(" objects using "),a("code",[t._v("|+|")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api1 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api2 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" api1 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" api2\n")])])]),a("h3",{attrs:{id:"how-to-deal-with-authentication-authorization"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#how-to-deal-with-authentication-authorization"}},[t._v("#")]),t._v(" How to deal with authentication/authorization?")]),t._v(" "),a("p",[t._v("This is typically handled with the help of ZIO environment. You can make your field require an "),a("code",[t._v("Auth")]),t._v(" service by returning a "),a("code",[t._v("ZIO[Auth, E, A]")]),t._v(". Then, in your resolver, access the "),a("code",[t._v("Auth")]),t._v(" service to check you have the appropriate permissions. You can inject the authentication information using a middleware in your HTTP server library. Check "),a("a",{attrs:{href:"https://github.com/search?q=repo%3Aghostdogpr%2Fcaliban+AuthExampleApp+language%3AScala&type=code&l=Scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" for a list of examples with different adapters.")]),t._v(" "),a("h3",{attrs:{id:"i-have-2-case-classes-with-the-same-name-different-packages-how-to-avoid-conflicts"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-have-2-case-classes-with-the-same-name-different-packages-how-to-avoid-conflicts"}},[t._v("#")]),t._v(" I have 2 case classes with the same name (different packages). How to avoid conflicts?")]),t._v(" "),a("p",[t._v("You can use the annotation "),a("code",[t._v("@GQLName")]),t._v(" to give another name to any type or field.")]),t._v(" "),a("h3",{attrs:{id:"the-auto-generated-schema-shows-a-field-is-nullable-but-i-want-it-non-nullable-instead"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#the-auto-generated-schema-shows-a-field-is-nullable-but-i-want-it-non-nullable-instead"}},[t._v("#")]),t._v(" The auto-generated schema shows a field is nullable, but I want it non-nullable instead.")]),t._v(" "),a("p",[t._v("A GraphQL field is marked as nullable if the Scala field returns an "),a("code",[t._v("Option")]),t._v(" or an effect that can fail. Change your effect to return "),a("code",[t._v("UIO")]),t._v(" if you want the field to be non-nullable, and use "),a("code",[t._v("orDie")]),t._v(" if you want to fail the whole query in case of error instead of returning null.")]),t._v(" "),a("h3",{attrs:{id:"can-i-use-a-union-as-input"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#can-i-use-a-union-as-input"}},[t._v("#")]),t._v(" Can I use a union as input?")]),t._v(" "),a("p",[t._v("Unfortunately, it is not supported by the GraphQL spec. See "),a("a",{attrs:{href:"https://github.com/graphql/graphql-spec/issues/488",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://github.com/graphql/graphql-spec/issues/488"),a("OutboundLink")],1),t._v(" for discussions. An alternative can be to define your own custom scalar.")]),t._v(" "),a("h3",{attrs:{id:"how-to-deal-with-recursive-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#how-to-deal-with-recursive-types"}},[t._v("#")]),t._v(" How to deal with recursive types?")]),t._v(" "),a("p",[t._v("Recursive types can be a little tricky. This is not a silver bullet but usually the trick is to add an "),a("code",[t._v("implicit lazy val")]),t._v(" instance of "),a("code",[t._v("Schema")]),t._v(" for the type that is recursive. See "),a("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/blob/master/examples/src/main/scala/example/optimizations/NaiveTest.scala#L82",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" for an example.")]),t._v(" "),a("h3",{attrs:{id:"i-m-getting-a-method-too-large-compiler-error"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-m-getting-a-method-too-large-compiler-error"}},[t._v("#")]),t._v(' I\'m getting a "Method too large" compiler error.')]),t._v(" "),a("p",[t._v("When you create a GraphQL API and use auto schema derivation, Caliban generates a schema for every type, everywhere it's used. If you have a lot of types, the generated code might be too large. The workaround is to use semi-auto derivation instead and define a "),a("code",[t._v("Schema")]),t._v(" for each of your case classes and sealed traits:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaMyType"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])]),a("p",[t._v("That way, the schema 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triple-quoted-string string"}},[t._v('"""\n query test {\n amos: character(name: "Amos Burton") {\n name\n }\n }"""')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])])])}),[],!1,null,null,null);a.default=n.exports}}]); \ No newline at end of file +(window.webpackJsonp=window.webpackJsonp||[]).push([[41],{323:function(t,a,e){"use strict";e.r(a);var s=e(14),n=Object(s.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"faq"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#faq"}},[t._v("#")]),t._v(" FAQ")]),t._v(" "),a("h3",{attrs:{id:"i-don-t-know-where-to-start-😥"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-don-t-know-where-to-start-😥"}},[t._v("#")]),t._v(" I don't know where to start 😥")]),t._v(" "),a("p",[t._v("No worries! Head to the "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/resources/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Resources"),a("OutboundLink")],1),t._v(" page to find a few introductory videos and blog posts, in particular this "),a("a",{attrs:{href:"https://blog.pierre-ricadat.com/a-beginners-guide-to-graphql-in-scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("Beginner's Guide to GraphQL in Scala"),a("OutboundLink")],1),t._v(". Once you're ready for more details, check the "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/",target:"_blank",rel:"noopener noreferrer"}},[t._v("Documentation"),a("OutboundLink")],1),t._v(". If you prefer looking at some code first, check "),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/examples.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("this list of examples"),a("OutboundLink")],1),t._v(".")]),t._v(" "),a("p",[t._v("If you're still lost, just come to the "),a("a",{attrs:{href:"https://discord.gg/EYpumuv",target:"_blank",rel:"noopener noreferrer"}},[t._v("Discord channel"),a("OutboundLink")],1),t._v("!")]),t._v(" "),a("h3",{attrs:{id:"i-m-getting-a-compilation-error-saying-a-schema-is-missing-but-i-don-t-know-which-one"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-m-getting-a-compilation-error-saying-a-schema-is-missing-but-i-don-t-know-which-one"}},[t._v("#")]),t._v(" I'm getting a compilation error saying a "),a("code",[t._v("Schema")]),t._v(" is missing, but I don't know which one.")]),t._v(" "),a("p",[t._v("Call directly "),a("code",[t._v("Schema.gen[YourType]")]),t._v(" or just "),a("code",[t._v("gen[YourType]")]),t._v(" if you extend "),a("code",[t._v("GenericSchema")]),t._v(". The error should be more detailed.\nIt is also recommended to use semi-auto derivation instead of auto derivation, as it will tell you more clearly which type is missing a schema.")]),t._v(" "),a("h3",{attrs:{id:"i-want-to-use-caliban-but-i-use-cats-effect-monix-instead-of-zio"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-want-to-use-caliban-but-i-use-cats-effect-monix-instead-of-zio"}},[t._v("#")]),t._v(" I want to use Caliban, but I use Cats Effect / Monix instead of ZIO.")]),t._v(" "),a("p",[t._v('That\'s not a problem! Caliban has interop modules that "hide" the ZIO details and expose Cats Effect or Monix types instead. Check the '),a("a",{attrs:{href:"https://ghostdogpr.github.io/caliban/docs/interop.html#cats-effect",target:"_blank",rel:"noopener noreferrer"}},[t._v("interop docs"),a("OutboundLink")],1),t._v(" for more details.")]),t._v(" "),a("h3",{attrs:{id:"my-query-fails-with-an-effect-failure-error-how-can-i-get-more-details"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#my-query-fails-with-an-effect-failure-error-how-can-i-get-more-details"}},[t._v("#")]),t._v(' My query fails with an "Effect failure" error. How can I get more details?')]),t._v(" "),a("p",[t._v("When an error happens in one of the resolvers, Caliban doesn't expose the inner exception to the client by default (this might be unsafe to do so), but you can easily work around this by several ways:")]),t._v(" "),a("ol",[a("li",[t._v("If you fail with a "),a("code",[t._v("CalibanError.ExecutionError")]),t._v(", it won't be wrapped by Caliban so the original message will be displayed")]),t._v(" "),a("li",[t._v("Using the wrapper "),a("code",[t._v("@@ printErrors")]),t._v(" will print the full error to the console")]),t._v(" "),a("li",[t._v("Using "),a("code",[t._v("mapError")]),t._v(" on your interpreter lets you unwrap the "),a("code",[t._v("CalibanError")]),t._v(" and return your inner exception instead")])]),t._v(" "),a("h3",{attrs:{id:"i-have-more-than-22-fields-in-my-query-i-can-t-create-a-case-class-for-it"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-have-more-than-22-fields-in-my-query-i-can-t-create-a-case-class-for-it"}},[t._v("#")]),t._v(" I have more than 22 fields in my Query, I can't create a case class for it.")]),t._v(" "),a("p",[t._v("Instead of one huge case class with all your fields, you can create smaller case classes and combine "),a("code",[t._v("GraphQL")]),t._v(" objects using "),a("code",[t._v("|+|")]),t._v(".")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api1 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api2 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" graphQL"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" api "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" api1 "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("+")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|")]),t._v(" api2\n")])])]),a("h3",{attrs:{id:"how-to-deal-with-authentication-authorization"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#how-to-deal-with-authentication-authorization"}},[t._v("#")]),t._v(" How to deal with authentication/authorization?")]),t._v(" "),a("p",[t._v("This is typically handled with the help of ZIO environment. You can make your field require an "),a("code",[t._v("Auth")]),t._v(" service by returning a "),a("code",[t._v("ZIO[Auth, E, A]")]),t._v(". Then, in your resolver, access the "),a("code",[t._v("Auth")]),t._v(" service to check you have the appropriate permissions. You can inject the authentication information using a middleware in your HTTP server library. Check "),a("a",{attrs:{href:"https://github.com/search?q=repo%3Aghostdogpr%2Fcaliban+AuthExampleApp+language%3AScala&type=code&l=Scala",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" for a list of examples with different adapters.")]),t._v(" "),a("h3",{attrs:{id:"i-have-2-case-classes-with-the-same-name-different-packages-how-to-avoid-conflicts"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-have-2-case-classes-with-the-same-name-different-packages-how-to-avoid-conflicts"}},[t._v("#")]),t._v(" I have 2 case classes with the same name (different packages). How to avoid conflicts?")]),t._v(" "),a("p",[t._v("You can use the annotation "),a("code",[t._v("@GQLName")]),t._v(" to give another name to any type or field.")]),t._v(" "),a("h3",{attrs:{id:"the-auto-generated-schema-shows-a-field-is-nullable-but-i-want-it-non-nullable-instead"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#the-auto-generated-schema-shows-a-field-is-nullable-but-i-want-it-non-nullable-instead"}},[t._v("#")]),t._v(" The auto-generated schema shows a field is nullable, but I want it non-nullable instead.")]),t._v(" "),a("p",[t._v("A GraphQL field is marked as nullable if the Scala field returns an "),a("code",[t._v("Option")]),t._v(" or an effect that can fail. Change your effect to return "),a("code",[t._v("UIO")]),t._v(" if you want the field to be non-nullable, and use "),a("code",[t._v("orDie")]),t._v(" if you want to fail the whole query in case of error instead of returning null.")]),t._v(" "),a("h3",{attrs:{id:"can-i-use-a-union-as-input"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#can-i-use-a-union-as-input"}},[t._v("#")]),t._v(" Can I use a union as input?")]),t._v(" "),a("p",[t._v("Unfortunately, it is not supported by the GraphQL spec. See "),a("a",{attrs:{href:"https://github.com/graphql/graphql-spec/issues/488",target:"_blank",rel:"noopener noreferrer"}},[t._v("https://github.com/graphql/graphql-spec/issues/488"),a("OutboundLink")],1),t._v(" for discussions. An alternative can be to define your own custom scalar.")]),t._v(" "),a("h3",{attrs:{id:"how-to-deal-with-recursive-types"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#how-to-deal-with-recursive-types"}},[t._v("#")]),t._v(" How to deal with recursive types?")]),t._v(" "),a("p",[t._v("Recursive types can be a little tricky. This is not a silver bullet but usually the trick is to add an "),a("code",[t._v("implicit lazy val")]),t._v(" instance of "),a("code",[t._v("Schema")]),t._v(" for the type that is recursive. See "),a("a",{attrs:{href:"https://github.com/ghostdogpr/caliban/blob/master/examples/src/main/scala/example/optimizations/NaiveTest.scala#L82",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),a("OutboundLink")],1),t._v(" for an example.")]),t._v(" "),a("h3",{attrs:{id:"i-m-getting-a-method-too-large-compiler-error"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-m-getting-a-method-too-large-compiler-error"}},[t._v("#")]),t._v(' I\'m getting a "Method too large" compiler error.')]),t._v(" "),a("p",[t._v("When you create a GraphQL API and use auto schema derivation, Caliban generates a schema for every type, everywhere it's used. If you have a lot of types, the generated code might be too large. The workaround is to use semi-auto derivation instead and define a "),a("code",[t._v("Schema")]),t._v(" for each of your case classes and sealed traits:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" schemaMyType"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" MyType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("gen\n")])])]),a("p",[t._v("That way, the schema for this type will be extracted to a single method and defined only once.")]),t._v(" "),a("h3",{attrs:{id:"how-can-i-define-a-schema-for-a-java-enum"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#how-can-i-define-a-schema-for-a-java-enum"}},[t._v("#")]),t._v(" How can I define a "),a("code",[t._v("Schema")]),t._v(" for a Java enum?")]),t._v(" "),a("p",[t._v("Here's an example for Java "),a("code",[t._v("DayOfWeek")]),t._v(":")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("val")]),t._v(" dayOfWeekSchema "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" DayOfWeek"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" toType"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("isInput"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Boolean")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" __Type "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Types"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("makeEnum"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n Some"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"DayOfWeek"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n DayOfWeek"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("values"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("toList"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("map"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("v "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" __EnumValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("v"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("false")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" None"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("\n None\n "),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("override")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" resolve"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" DayOfWeek"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Step"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" PureStep"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("StringValue"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("value"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("name"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),a("h3",{attrs:{id:"i-don-t-want-to-use-throwable-as-my-error-type"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#i-don-t-want-to-use-throwable-as-my-error-type"}},[t._v("#")]),t._v(" I don't want to use "),a("code",[t._v("Throwable")]),t._v(" as my error type")]),t._v(" "),a("p",[t._v("Caliban provides "),a("code",[t._v("Schema")]),t._v(" instances for "),a("code",[t._v("ZIO")]),t._v(", "),a("code",[t._v("ZQuery")]),t._v(" and "),a("code",[t._v("ZStream")]),t._v(" but with the condition that the error type is a "),a("code",[t._v("Throwable")]),t._v(".\nThat is because the error is eventually wrapped inside Caliban "),a("code",[t._v("ExecutionError")]),t._v(" and we need to know what it is.\nHowever, you can easily define a custom "),a("code",[t._v("Schema")]),t._v(" without this constraint, as long as you provide a function from your error type to "),a("code",[t._v("ExecutionError")]),t._v(".")]),t._v(" "),a("p",[t._v("For example, if your error type is "),a("code",[t._v("Int")]),t._v(", you can use "),a("code",[t._v("Schema.customErrorEffectSchema")]),t._v(" as follows:")]),t._v(" "),a("div",{staticClass:"language-scala extra-class"},[a("pre",{pre:!0,attrs:{class:"language-scala"}},[a("code",[a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("def")]),t._v(" customEffectSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("A"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("implicit")]),t._v(" s"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" A"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Any")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" IO"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" A"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("\n Schema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("customErrorEffectSchema"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("code"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v(":")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token builtin"}},[t._v("Int")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("=>")]),t._v(" ExecutionError"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string-interpolation"}},[a("span",{pre:!0,attrs:{class:"token id function"}},[t._v("s")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Error code ')]),a("span",{pre:!0,attrs:{class:"token interpolation"}},[a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("$")]),a("span",{pre:!0,attrs:{class:"token expression"}},[t._v("code")])]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"')])]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])])]),a("p",[t._v("With this implicit in scope, Caliban will know how to handle any "),a("code",[t._v("IO[Int, A]")]),t._v(" effects.\nCaliban will automatically fill the error path and the error location inside "),a("code",[t._v("ExecutionError")]),t._v(" if an error happens during the query execution.")]),t._v(" "),a("h3",{attrs:{id:"my-interface-is-missing-from-the-schema"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#my-interface-is-missing-from-the-schema"}},[t._v("#")]),t._v(" My interface is missing from the schema")]),t._v(" "),a("p",[t._v("If you have an interface that is not directly returned by any field, it will be missing from the schema. 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Get Started →

High performance

While all public interfaces are pure and immutable, the library's internals are optimized for speed.

Minimal boilerplate

No need to manually define schemas for every type in your API. Let the compiler handle the tedious work.

Excellent interoperability

Out-of-the-box support for major HTTP server libraries, effect types, JSON libraries, and more.

- + diff --git a/docs/resources/index.html b/docs/resources/index.html index 0aae4e0cd1..51f474f12a 100644 --- a/docs/resources/index.html +++ b/docs/resources/index.html @@ -8,7 +8,7 @@ - + @@ -38,6 +38,6 @@ Scaladoc (opens new window)

# Resources

# Talks

# Blog Articles

- +