Check native dataclasses work

[coretl]

Take the example off the strawberry page:

import strawberry

@strawberry.type
class User:
    name: str
    age: int

@strawberry.type
class Query:
    @strawberry.field
    def user(self) -> User:
        return User(name="Patrick", age=100)

schema = strawberry.Schema(query=Query)

Would this also work with plain dataclasses?

import strawberry
from dataclasses import dataclass

@dataclass
class User:
    name: str
    age: int

@strawberry.type
class Query:
    @strawberry.field
    def user(self) -> User:
        return User(name="Patrick", age=100)

schema = strawberry.Schema(query=Query)

[rjwills28]

I have tried testing this simple example but unfortunately it does not work with the plain dataclass. When starting up the Strawberry server I get an error 'Query fields cannot be resolved. Unexpected type <class app.User>'.
I will do a little bit more investigating to see if there is any other way round this.

[coretl]

You might be able to do something like this for dataclasses

[rjwills28]

Thanks for the idea!

This implementation of native dataclasses with strawberry.experimental.pydantic.types does work so hopefully we should be able to do something similar for our application.

import strawberry
from dataclasses import dataclass
from pydantic import BaseModel

@dataclass
class User(BaseModel):
    name: str
    age: int

@strawberry.experimental.pydantic.type(model=User, all_fields=True)
class UserType:
    pass

@strawberry.type
class Query:
    @strawberry.field
    def user(self) -> UserType:
        return UserType(name="Patrick", age=100)


schema = strawberry.Schema(query=Query)

[rjwills28]

A more complicated check is if we can directly integrate a schema generated by 'apischema' (https://wyfo.github.io/apischema/0.17/graphql/overview/) in Strawberry. Potentially we could use the engine from FastAPI.

I tried to get Strawberry to use a schema generated by apischema but I don't think this is possible. I got the apischema working and creating a schema from the code but I cannot see how to inject this into a Strawberry + FastAPI implementation. Strawberry will only work with a strawberry.Schema object. See GraphQLRouter on https://strawberry.rocks/docs/integrations/fastapi.