[BUG] AdditionalProperties referenced when it does not exist, object + composition

[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?
• [Optional] Sponsorship to speed up the bug fix or feature request

AdditionalProperties referenced when it does not exist, schema type is object + composition

Description

AdditionalProperties referenced when it does not exist, schema type is object + composition

openapi-json-schema-generator version

opeanpi-generator latest (should be functionally equivalent to this)

OpenAPI declaration file content or url

components:
  schemas:
    AbstractStepMessage:
      required:
        - description
        - discriminator
        - sequenceNumber
      type: object
      properties:
        discriminator:
          type: string
      description: Abstract Step
      discriminator:
        propertyName: discriminator
      anyOf:
        - $ref: '#/components/schemas/AbstractStepMessage'

And when instantiating the class one gets:

  File "/Users/justinblack/programming/swagger_cpayne/venv/lib/python3.9/site-packages/openapi_client-1.0.0-py3.9.egg/openapi_client/model/abstract_step_message.py", line 26, in <module>
  File "/Users/justinblack/programming/swagger_cpayne/venv/lib/python3.9/site-packages/openapi_client-1.0.0-py3.9.egg/openapi_client/model/abstract_step_message.py", line 114, in AbstractStepMessage
AttributeError: type object 'MetaOapg' has no attribute 'additional_properties'

And the instantiation signature is:

    def __new__(
        cls,
        *args: typing.Union[dict, frozendict.frozendict, ],
        sequenceNumber: typing.Union[MetaOapg.additional_properties, dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, bool, None, list, tuple, bytes, io.FileIO, io.BufferedReader, ],
        description: typing.Union[MetaOapg.additional_properties, dict, frozendict.frozendict, str, date, datetime, uuid.UUID, int, float, decimal.Decimal, bool, None, list, tuple, bytes, io.FileIO, io.BufferedReader, ],
        discriminator: typing.Union[MetaOapg.properties.discriminator, str, ],
        _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],
    ) -> 'AbstractStepMessage':

sequenceNumber + description incorrectly refer to nonexistent additional_properties

Generation Details

python

Steps to reproduce

Related issues/PRs

Suggest a fix

This should have been fixed in: https://github.com/openapi-json-schema-tools/openapi-json-schema-generator/pull/44/files