discriminator seems not to be supported to manage polymorphism

[mexavier]

Hi

I use quarkus-openapi-generator with a contract first approach for a new project. The team has a 6-month experience with quarkus.

However we failed to manage correctly polymorphism with quarkus-openapi-generator. The goal is to have operations that can manage multiple sub-types in the request or response.
We tried to use the discriminator keyword on setting it on the parent class and specifying the children implementations in the mapping part.

Hereunder is a exerpt :

    CloudEvent:
      type: object
      discriminator:
        propertyName: type
        mapping:
            CloudEventChild1: '#/components/schemas/CloudEventChild1'
            CloudEventChild2: '#/components/schemas/CloudEventChild2'
      properties:
        specVersion:
          $ref: '#/components/schemas/SpecVersion'
        id:
          type: string
        type:
          type: string
        source:
          format: uri
          type: string
        dataContentType:
          type: string
        dataSchema:
          format: uri
          type: string
        subject:
          type: string
        time:
          format: date-time
          type: string
        attributeNames:
          uniqueItems: true
          type: array
          items:
            type: string
        extensionNames:
          uniqueItems: true
          type: array
          items:
            type: string
        data:
          $ref: '#/components/schemas/CloudEventData'
    CloudEventChild1:
      type: object
      allOf:
        - $ref: '#/components/schemas/CloudEvent'
      properties:
        child1:
          type: string
    CloudEventChild2:
      type: object
      allOf:
          - $ref: '#/components/schemas/CloudEvent'
      properties:
          child2:
            type: string

When I generate the classes the classes does not hold the annotations @JsonTypeInfo and @JsonSubTypes managed by Jackson.

If do the same with "openapi generator 6" with jaxrs-resteasy, the generated class holds correcly those annotations :

@javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaResteasyServerCodegen", date = "2023-10-09T12:40:51.890826200+02:00[Europe/Zurich]")@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
@JsonSubTypes({
  @JsonSubTypes.Type(value = CloudEventChild1.class, name = "CloudEventChild1"),
  @JsonSubTypes.Type(value = CloudEventChild2.class, name = "CloudEventChild2"),
})

public class CloudEvent   {
...

Is it a limitation of the Quarkus OpenApi Generator or is there an other way to manage polymorphism ?

Thank you.

Xavier

[ricardozanini]

Hi @mexavier I'm afraid our templates are not handling this use case. Do you mind opening an issue?

[hbelmiro]

Issue opened: #520