[BUG] Can't serialize objects when `Enum` are defined within an `Object`

[rvalim]

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 (example)

Description

openapi-generator version

7.3.0

OpenAPI declaration file content or url

openapi: 3.0.3
components:
  schemas:
    TransportLocation:
      example:
        iataCode: ZRH
        locationType: AIRPORT
      properties:
        iataCode:
          description: IATA code for the location
          example: ZRH
          type: string
        locationType:
          description: Type of the transport location
          enum:
          - UNKNOWN
          - AIRPORT
          - TRAIN_STATION
          - BUS_STATION
          - AREA
          example: AIRPORT
          type: string
      required:
      - iataCode
      - locationType
      type: object

Generation Details

When generating code based on the provided yaml, there is no for the any enumeration property defined within an object.
Taking locationType as an example, I could solve it by first declaring an Enum object and then adding its reference to the TransportLocation, solution below:

    TransportLocationType:
      description: Type of the transport location
      enum:
        - UNKNOWN
        - AIRPORT
        - TRAIN_STATION
        - BUS_STATION
        - AREA
      type: string
      example: AIRPORT

    TransportLocation:
      example:
        iataCode: ZRH
        locationType: AIRPORT
      properties:
        iataCode:
          description: IATA code for the location
          example: ZRH
          type: string
        locationType:
          $ref: '#/components/schemas/TransportLocationType'
      required:
      - iataCode
      - locationType
      type: object

Only after that the properly EnumNameSerializer/Converted were created:

Scala version:

Java version:

Steps to reproduce

openapi-generator generate -c <yaml file path>

Related issues/PRs

Didn't found any one.

[martin-mfg]

Hi, I just created a fix for this problem. After the fix is released, you need to set RESOLVE_INLINE_ENUMS to true (documented here) for the Converters to be generated.