put condition judgement in customized func

[LiliDeng]

when I use '{}' or 'null' in below code, I always get deploy error

func getOsProfile(node object, admin_username string, admin_password string, admin_key_data string) object => isCvm(node) 
? {}
: generateOsProfile(node, admin_username, admin_password, admin_key_data)
...
osProfile: getOsProfile(nodes[i], admin_username, admin_password, admin_key_data)

when use null or json('null'), the error is 'The provided value for the output of the user-defined function '__bicep.getOsProfile' is not valid. The value '' is not part of the allowed value(s): '{}'.'",

when use {}, the error is "details":[{"code":"InvalidParameter","target":"computerName","message":"Required parameter 'computerName' is missing (null)."

but use this directly in resource, it works well, how I can wrap the logic into a func?

osProfile: isCvm(nodes[i]) ? null: generateOsProfile(nodes[i], admin_username, admin_password, admin_key_data)

[jeskew]

The output type for getOsProfile is non-nullable. Function parameter and output types are enforced by the ARM engine at runtime, so returning null will raise an error. You can allow a null return by using a ? suffix on the return type to make it nullable (i.e., object? instead of object):

func getOsProfile(node object, admin_username string, admin_password string, admin_key_data string) object? => isCvm(node) 
? null
: generateOsProfile(node, admin_username, admin_password, admin_key_data)
...
osProfile: getOsProfile(nodes[i], admin_username, admin_password, admin_key_data)

[LiliDeng]

thanks, it works, there is another following issue if I use object?, I use bicep cli to build arm template json format based on the bicep file. After using object?, the converted json file contains line "languageVersion": "2.0", and the resources should be list but it changes into dict. I suspect it is related some bicep version?

since we use python sdk deploy azure resource, but now the sdk doesn't support to deploy resource with bicep template directly, but we still want to use bicep, so we update bicep template every time, then build it into arm template.

[jeskew]

User-defined types (including nullable types) are only available in ARM language version 2.0, which uses a dict for resources instead of an array. The template will still be deployable.

[LiliDeng]

appreciate your quick response and professional guidance.