[Question] Python anyof template vendor extension type

Hi,

I'm currently trying to activate mypy on our generated code and have a small issue with a model for an anyof-type.

The generated code contains (template: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/python/model_anyof.mustache#L24)

    # data type: bytearray
    anyof_schema_4_validator: Optional[Union[StrictBytes, StrictStr, Tuple[StrictStr, StrictBytes]]] = None

The data type of variable actual_instance is (template: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/python/model_anyof.mustache#L28)

        actual_instance: Optional[Union[...., bytearray, .... ]] = None

So there is a discrepancy between the types of the validator and the actual instance variable. Mypy then complains about code in the from_json method (template: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/python/model_anyof.mustache#L115):

        try:
            # validation
            instance.anyof_schema_4_validator = json.loads(json_str)
            # assign value to actual_instance
            instance.actual_instance = instance.anyof_schema_4_validator

Here, the generated code assigns bytearray to StrictBytes etc. - this probably works fine, but to please mypy it would be nice to use also the StrictBytes type in the type hint for variable actual_instance (and probably also for the ...ANY_OF_SCHEMAS variable (https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/python/model_anyof.mustache#L16).

Is this already possible with some kind of vendor extension?

Thanks and best regards
oz

Start with modules/openapi-generator/src/main/resources/python/model_anyof.mustache, especially lines 16, 24, 28, and 115, and compare the generated validator and actual_instance type hints. Check whether an existing vendor extension controls these types; done means the generated anyof model has consistent mypy-compatible annotations without breaking validation.