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Showing content from https://github.com/OpenAPITools/openapi-generator/issues/5247 below:

[BUG][Kotlin] Incorrect enum parameter type · Issue #5247 · OpenAPITools/openapi-generator · GitHub

Kotlin generation is producing a wrong parameter type for an enum that is declared in an array. It is getting the type from another array declared in the same object

4.2.3

openapi: 3.0.0
info:
  description: Blah
  version: v2
paths:
  /api/v2/query:
    post:
      operationId: foo
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Query"
components:
  schemas:
    Query:
      type: object
      properties:
        groupBy:
          type: array
          items:
            type: string
            enum:
              - value1
              - value2
              - value3
              - value4
        views:
          type: array
          items:
            type: int

openapi-generator generate -i test.yml -g kotlin --skip-validate-spec -o output

• Store the yml contents into a file named test.yml.
• Run openapi-generator generate -i test.yml -g kotlin --skip-validate-spec -o output
• examine the contents of output/src/main/kotlin/org/openapitools/client/models/Query.kt

You will see this code:

    enum class GroupBy(val value: Int){
        @Json(name = "value1") value1("value1"),
        @Json(name = "value2") value2("value2"),
        @Json(name = "value3") value3("value3"),
        @Json(name = "value4") value4("value4");
    }

The Int parameter type here is not correct and will not compile. It should be kotlin.String. That type is coming from the views array type. If you change the type used for the views array it changes the GroupBy parameter type. If you remove the views property it does generate the correct code.

nickbw2003, grEvenX and mattbroekhuis

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