[BUG][Kotlin] Enum with Int values generated to hold String

[ivanvasheka-intellias]

openapi-generator version

6.3.0

Source json

"typeIDs": {
          "description": "Ids",
          "type": "array",
          "items": {
            "format": "int32",
            "type": "integer",
            "enum": [
              0,
              7,
              8,
              9,
              10,
              11,
              12,
              13,
              14,
              15,
              16,
              19,
              -98
            ]
          }
        }

Generation code

enum class TypeIDs(val value: kotlin.String) {
        @Json(name = "0") _0(0),
        @Json(name = "7") _7(7),
        @Json(name = "8") _8(8),
        @Json(name = "9") _9(9),
        @Json(name = "10") _10(10),
        @Json(name = "11") _11(11),
        @Json(name = "12") _12(12),
        @Json(name = "13") _13(13),
        @Json(name = "14") _14(14),
        @Json(name = "15") _15(15),
        @Json(name = "16") _16(16),
        @Json(name = "19") _19(19),
        @Json(name = "-98") MINUS98(-98);
    }

Generated code has type String in the declaration (enum class TypeIDs(val value: kotlin.String)), however every entry is populated with an Int value (ex. _0(0), and not _0("0")), which results into a compilation error.

[noulis]

Any workaround for this? Or any expectation if this will be fixed?

[ctamisier]

This also can be reproduced with this openapi file: https://api-docs.jrni.com/v5/swagger/admin.json

(also with openapi-generator 7.2.0 version)

[Aschraf]

Still happening with 7.5.0

[takkiraz]

Still happening with 7.9.0

[childnode]

yes, still alive on 7.12.0
Example:

      target_access_levels:
        type: array
        description: Target user roles
        items:
          type: integer
          format: int32
          enum:
          - 10
          - 15
          - 20
          - 30
          - 40
          - 50

in https://gitlab.com/gitlab-org/gitlab/-/raw/master/doc/api/openapi/openapi_v2.yaml

by using

openApiGenerate {
    generatorName.set("kotlin")
    library.set("jvm-ktor")

    skipValidateSpec.set(true)

    configOptions.putAll(
        mapOf(
            "dateLibrary" to "kotlinx-datetime",
            "serializationLibrary" to "kotlinx_serialization",
            "useCoroutines" to "true",
        )
    )
}

[exviva]

I opened a PR with the fix: #22324