[BUG] Kotlin generator produce a invalid kotlin file when shema have an enum with default value.

Created by: etremblay

Description

Kotlin generator produce a invalid kotlin file when shema have an enum with default value.

Unresolved reference: TypeEnum

openapi-generator version

5.2.1, master

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: 'Enum Bug'
  version: latest
paths:
  '/':
    get:
      operationId: demoBug
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MoveMovement'
components:
  schemas:
    MoveMovement:
      required:
        - type
      properties:
        type:
          type: string
          default: MOVE
          enum:
            - MOVE

Generation Details

docker run --rm  -v ${PWD}:/local --user "${USER_ID}:${GROUP_ID}" openapitools/openapi-generator-cli:latest generate -i /local/model.yaml -g kotlin -o /local/kotlin

Steps to reproduce

Generate a model with an enum property with default value

The model constructor will have invalid kotlin code

  data class MovementMoveMovement (

    @Json(name = "type")
    val type: MovementMoveMovement.Type = TypeEnum.MOVE

) : MovementMovement {

    /**
     * 
     *
     * Values: MOVE
     */
    enum class Type(val value: kotlin.String) {
        @Json(name = "MOVE") MOVE("MOVE");
    }
}

should be

   val type: MovementMoveMovement.Type = Type.MOVE

Related issues/PRs

The regression was introduced by https://github.com/OpenAPITools/openapi-generator/pull/9853 in 5.2.1

Suggest a fix

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java

    @Override
    public String toEnumName(CodegenProperty property) {
        return property.nameInCamelCase;
    }

I will try to submit a proper pull request with unit tests.