[BUG] Required property not in properties refers to nonexistant definition

[spacether]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

Adding a requirement on a sibling field in an allOf breaks the model import

openapi-generator version

6.2.0

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: test
  version: 1.0.0
paths:
  /:
    get:
      responses:
        200:
          description: "OK"
components:
  schemas:
    Test:
      type: object
      properties:
        test:
          type: string
    TestRequired:
      allOf:
        - $ref: '#/components/schemas/Test'
        - type: object
          required: [test]
          properties:
            name:
              type: string

Generation Details

openapi-generator-cli generate -g python -i test.yaml -o out

Steps to reproduce

Generate the client then try to import the generated "TestRequired" class. It will fail with an Error AttributeError: type object 'properties' has no attribute 'test'

The generated class is the following

# coding: utf-8

"""
    test

    No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)  # noqa: E501

    The version of the OpenAPI document: 1.0.0
    Generated by: https://openapi-generator.tech
"""

from datetime import date, datetime  # noqa: F401
import decimal  # noqa: F401
import functools  # noqa: F401
import io  # noqa: F401
import re  # noqa: F401
import typing  # noqa: F401
import typing_extensions  # noqa: F401
import uuid  # noqa: F401

import frozendict  # noqa: F401

from openapi_client import schemas  # noqa: F401


class TestRequired(
    schemas.ComposedSchema,
):
    """NOTE: This class is auto generated by OpenAPI Generator.
    Ref: https://openapi-generator.tech

    Do not edit the class manually.
    """


    class MetaOapg:
        
        
        class all_of_1(
            schemas.DictSchema
        ):
        
        
            class MetaOapg:
                required = {
                    "test",
                }
                
                class properties:
                    name = schemas.StrSchema
                    __annotations__ = {
                        "name": name,
                    }
            
            test: schemas.AnyTypeSchema
            
            @typing.overload
            def __getitem__(self, name: typing_extensions.Literal["name"]) -> MetaOapg.properties.name: ...
            
            @typing.overload
            def __getitem__(self, name: str) -> schemas.UnsetAnyTypeSchema: ...
            
            def __getitem__(self, name: typing.Union[typing_extensions.Literal["name", ], str]):
                # dict_instance[name] accessor
                return super().__getitem__(name)
            
            
            @typing.overload
            def get_item_oapg(self, name: typing_extensions.Literal["name"]) -> typing.Union[MetaOapg.properties.name, schemas.Unset]: ...
            
            @typing.overload
            def get_item_oapg(self, name: str) -> typing.Union[schemas.UnsetAnyTypeSchema, schemas.Unset]: ...
            
            def get_item_oapg(self, name: typing.Union[typing_extensions.Literal["name", ], str]):
                return super().get_item_oapg(name)
            
        
            def __new__(
                cls,
                *args: typing.Union[dict, frozendict.frozendict, ],
                test: typing.Union[MetaOapg.properties.test, dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, bool, None, list, tuple, bytes, io.FileIO, io.BufferedReader, ],
                name: typing.Union[MetaOapg.properties.name, str, schemas.Unset] = schemas.unset,
                _configuration: typing.Optional[schemas.Configuration] = None,
                **kwargs: typing.Union[schemas.AnyTypeSchema, dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, None, list, tuple, bytes],
            ) -> 'all_of_1':
                return super().__new__(
                    cls,
                    *args,
                    test=test,
                    name=name,
                    _configuration=_configuration,
                    **kwargs,
                )
        
        @classmethod
        @functools.lru_cache()
        def all_of(cls):
            # we need this here to make our import statements work
            # we must store _composed_schemas in here so the code is only run
            # when we invoke this method. If we kept this at the class
            # level we would get an error because the class level
            # code would be run when this module is imported, and these composed
            # classes don't exist yet because their module has not finished
            # loading
            return [
                Test,
                cls.all_of_1,
            ]


    def __new__(
        cls,
        *args: typing.Union[dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, bool, None, list, tuple, bytes, io.FileIO, io.BufferedReader, ],
        _configuration: typing.Optional[schemas.Configuration] = None,
        **kwargs: typing.Union[schemas.AnyTypeSchema, dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, None, list, tuple, bytes],
    ) -> 'TestRequired':
        return super().__new__(
            cls,
            *args,
            _configuration=_configuration,
            **kwargs,
        )

from openapi_client.model.test import Test

the constructor of all_of_1 expects a required test argument whose typing is based on properties which doesn't contain it.

Suggest a fix

Add typing for required parameters not existing in properties as AnyTypeSchema

Copied from: OpenAPITools/openapi-generator#13676