oneOf is not being validated/used for generating models, consider the following example:

oneOf Example:

    Parent:
      type: object
      properties:
        type:
          type: string
          description: Some description.
      discriminator:
        propertyName: type
        mapping:
          ChildOne: '#/components/schemas/ChildOne'
          ChildTwo: '#/components/schemas/ChildTwo'
      oneOf:
      - $ref: '#/components/schemas/ChildOne'
      - $ref: '#/components/schemas/ChildTwo'
    ChildOne:
      title: ChildOne
      type: object
      properties:
        data:
          $ref: '#/components/schemas/Data'
    ChildTwo:
      title: ChildTwo
      type: object
      properties:
        properties:
        data:
          $ref: '#/components/schemas/Data'

In this case, both ChildOne and ChildTwo models/classes should inherit from Parent, but that is not the actual result, on the other hand, using allOf in children results in ChildOne and ChildTwo models/classes inheriting from Parent.

allOf example:

    Parent:
      type: object
      properties:
        type:
          type: string
          description: Some description.
    ChildOne:
      allOf:
           - $ref: '#/components/schemas/Parent'
      title: ChildOne
      type: object
      properties:
        data:
          $ref: '#/components/schemas/Data'
    ChildTwo:
      allOf:
           - $ref: '#/components/schemas/Parent'
      title: ChildTwo
      type: object
      properties:
        properties:
        data:
          $ref: '#/components/schemas/Data'

Used commandline:

$ datamodel-codegen ADD YOUR EXACT COMMAND USED HERE

Expected behavior
A clear and concise description of what you expected to happen.

Version:

• OS: MacOS
• Python version: 3.9
• datamodel-code-generator version: 0.16.1

Additional context