[PYTHON] generate code based on pydantic v2

[fa0311]

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• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
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  ./mvnw clean package 
  ./bin/generate-samples.sh ./bin/configs/*.yaml
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
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[multani]

Running the tests in samples/openapi3/client/petstore/python-aiohttp goes from:

148 passed, 2 skipped, 2100 warnings

to:

148 passed, 2 skipped, 60 warnings

and I don't see any Pydantic v2 warnings anymore 👏

[wing328]

FYI @taxpon (2017/07) @frol (2017/07) @mbohlool (2017/07) @cbornet (2017/09) @kenjones-cisco (2017/11) @tomplus (2018/10) @arun-nalla (2019/11) @krjakbrjak (2023/02)

[wing328]

tested locally and all those pydantic warnings are gone 👍

[jakubno]

I am receiving TypeError: argument of type 'ModelPrivateAttr' is not iterable

It's caused by

        # raise errors for additional fields in the input
        for _key in obj.keys():
>           if _key not in cls.__properties:
E           TypeError: argument of type 'ModelPrivateAttr' is not iterable

Whole snippet

    __properties = ["sessionID"]

    @classmethod
    def from_dict(cls, obj: dict) -> Session:
        """Create an instance of Session from a dict"""
        if obj is None:
            return None

        if not isinstance(obj, dict):
            return Session.model_validate(obj)

        # raise errors for additional fields in the input
        for _key in obj.keys():
            if _key not in cls.__properties:
                raise ValueError(
                    "Error due to additional fields (not defined in Session) in the input: "
                    + obj
                )

        _obj = Session.model_validate(
            {
                "sessionID": obj.get("sessionID"),
            }
        )
        return _obj

It worked in #16655

[multani]

I am receiving TypeError: argument of type 'ModelPrivateAttr' is not iterable

It's caused by

        # raise errors for additional fields in the input
        for _key in obj.keys():
>           if _key not in cls.__properties:
E           TypeError: argument of type 'ModelPrivateAttr' is not iterable

@jakubno do you have an OpenAPI example where this happens?

This was changed in #16624 but I think we missed a branch that was not covered by the tests.

[jakubno]

I will create minimal example and create issue

[multani]

I will create minimal example and create issue

Great, thanks 👍

If that helps, it seems it has something to do with "additional properties": this is the part in the code generator that may not be covered by the tests.

[fa0311]

Perhaps cls.__properties should be replaced with cls.__properties.default

[multani]

Yep, that's what I did in the branch that was covered by the tests 👍

[fa0311]

If you test this, you need to set the disallowAdditionalPropertiesIfNotPresent to true.
https://github.com/fa0311/openapi-generator/blob/e2f249ba35e2da2f9936efaf5434068238cfc68c/bin/configs/python.yaml#L8

[wing328]

NOTE: for users who still prefer using pydantic v1 in v7.1.0 release, they can use the python-pydantic-v1 client generator.