[JAVA] Inheritence without discriminator, is it possible ?

[TehBakker]

Description

I've tried doing inheritance without discriminator and I think something changed in the latest version as I find "example" online which work the way I wanted it, but it's not what I'm generating with the 2.2.3 SNAPSHOT.

From reading #2096 it feels like it is now impossible to generate inheritence without a discriminator.

    MyParent:
      type: object
      properties:
        code:
          type: string

    MyChild:
      type: object
      allOf:
        - $ref: '#/definitions/MyParent'
        - properties:
            label:
              type: string

public class MyParentApiBean   {
  @JsonProperty("code")
  private String code = null;
}

public class MyChildApiBean   {
  @JsonProperty("code")
  private String code = null;

  @JsonProperty("label")
  private String label = null;
}

If I add a discriminator I do get inheritance but also an extra field (the discriminator field)
In my use case I do not want discriminator as the 2 objects will be used on different API path so there is never the need to know which type it at de-serialization.
And I do not want to force people to add an extra attribut in their json.

The use case I've is I want to be able to define a method taking a MyParentApiBean and working with the code field be it MyParentApiBean or MyChildApiBean.
Right now I've to declare the attribut as an Object and do instanceof or duplicate code.

Swagger-codegen version

2.2.3-SNAPSHOT

Suggest a fix/enhancement

I understand the issue with multiple allOf inheritance, but that could be fixed with interface as suggested #5275
Or if there is a single allOf inheritance could be done still with inheritance.

Again thanks for your work.
Hope to have the time to give a hand soon.

[felixbarny]

I'd really appreciate that feature as well

[holomekc]

This works for me:

MyParent:
    type: object
    discriminator: ThisIsConfusingForMe
    properties:
      code:
        type: string
  MyChild:
    type: object
    allOf:
      - $ref: '#/definitions/MyParent'
      - properties:
          label:
            type: string

But I do not like it. I even do not understand why this is working. It feels very unstable and I am not sure if we will fix it with this "workaround".

[SergeyLyakhov]

Added PR #7593
cc: @jeff9finger @wing328

[vlauciani]

Regarding this problem, I've found a workaround:

1. remove the discriminator(s) from the original yaml.
2. convert the yaml to json
3. use the openapi-generator-cli https://github.com/OpenAPITools/openapi-generator to generate JAVA Class.

hope this help.