[BUG] Using `allOf` and `$ref` generates an `object` in the python model when it should be a `string`

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?

Description

openapi-generator version

Docker CLI latest

OpenAPI declaration file content or url

BankTransferCreateRequest:
  title: BankTransferCreateRequest
  type: object
  description: BankTransferCreateRequest defines the request schema for `/bank_transfer/create`
  properties:
    access_token:
      description: Some Description
      allOf:
        - $ref: '#/components/schemas/AccessToken'
 
AccessToken:
  title: AccessToken
  type: string
  description: The access token associated with the Item data is being requested for.

/bank_transfer/create:
  post:
    operationId: bankTransferCreate
    requestBody:
      required: true
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/BankTransferCreateRequest'

Generation Details

$(OPENAPI_GENERATOR_LATEST) -g python -i local/$(OPENAPI_FILE) -o local/$(OUTPUT_FOLDER)/generated-python

Steps to reproduce

Run the generator, try accessing the BankTransferCreateRequest model. See that access_token is object instead of string.

return {
    'access_token': (object,),  # noqa: E501
}

Related issues/PRs

Suggest a fix

[spacether]

Re-opening this until examples have been added in python-experimental verifying that this is working at levels deeper than a root component with composition. Tests are needed of:

1. component property with composition
2. parameter with composition
3. request body with composition
4. response body with composition
5. parameter property with composition
6. request body property with composition
7. response body property with composition

[spacether]

If you define patient as its own component and then $ref to patient in PatientScanDto does this work? I suspect that this is an openapi inline schema issue and is not specific to the python generator. Does you allOf define the value in patient? If so should allOf be indented?