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[REQ][JAVA] oneOf discriminator type string with enum defined #12412

Description

@tedberg
Description

Using version 6 beta, oneOf is working well, generating POJOs. We get the interface with public String getType(); and the impl classes. The type we want to use had previously been defined as a string/enum, so it would be nice if we could define teh discriminator string to also be an enum.

openapi-generator version

6.0.0-beta

OpenAPI declaration file content or url
title: Type
type: string
default: "A"
enum:
  - "A"
  - "B"
  - "C"

Our discriminator is setup like this.

title: Example
type: object
discriminator:
  propertyName: type
  type: string
  mapping:
    A: './A.yaml'
    B: './B.yaml'
    C: './C.yaml'
oneOf:
  - $ref: './A.yaml'
  - $ref: './B.yaml'
  - $ref: './C.yaml'

The A object adds the type property, referencing the string with enum above.


title: A
type: object
properties:
  type:
    $ref: './Type.yaml'
...

If we remove the enum part, everything generates properly and works with type as a String object. Seeing that the mapping is essentially an enum itself, it would be nice, if the above would work, generating public Type getType(); in the interface. (It already generates nicely with enum in the implementing classes.)

Command line used for generation

Maven plugin,
<openapi.generator.maven.plugin.templateResourcePath>JavaSpring</openapi.generator.maven.plugin.templateResourcePath>

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