[BUG][KOTLIN] Generated enum does not compile if type mapping is not defined #22425

Author: jbardel

bin/configs/kotlin-enum-bigdecimal-value.yaml

@@ -0,0 +1,9 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-enum-bigdecimal-value
+inputSpec: modules/openapi-generator/src/test/resources/3_0/kotlin/issue-enum-bigdecimal-value.yml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-enum-bigdecimal-value
+  serializationLibrary: gson
+globalProperties:
+  models: ""

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java

@@ -883,6 +883,8 @@ public String toEnumValue(String value, String datatype) {
             }
         } else if ("kotlin.Float".equals(datatype)) {
             return value + "f";
+        } else if("java.math.BigDecimal".equals(datatype)){
+            return value+".toBigDecimal()";
         } else {
             return "\"" + value + "\"";
         }

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/AbstractKotlinCodegenTest.java

@@ -99,6 +99,7 @@ public void toEnumValue() {
         assertEquals(codegen.toEnumValue("1.0", "kotlin.Float"), "1.0f");
         assertEquals(codegen.toEnumValue("data", "Something"), "\"data\"");
         assertEquals(codegen.toEnumValue("data/*", "Something"), "\"data/*\"");
+        assertEquals(codegen.toEnumValue("1", "java.math.BigDecimal"), "1.toBigDecimal()");
     }
 
     @Test
@@ -382,6 +383,20 @@ public void handleInheritanceWithObjectTypeShouldNotBeAMap() {
                 .fromModel("MapSchema", mapSchema);
         Assert.assertTrue(mapSchemaModel.isMap);
     }
+    
+    @Test
+    public void enumIssueWithBigDecimal() {
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/kotlin/issue-enum-bigdecimal-value.yml");
+
+        Schema test1 = openAPI.getComponents().getSchemas().get("ModelWithEnumBigDecimalValue");
+        CodegenModel cm1 = codegen.fromModel("ModelWithEnumBigDecimalValue", test1);
+        
+        codegen.postProcessModels(createCodegenModelWrapper(cm1));
+        
+        //Assert that the generated type is BigDecimal 
+        CodegenProperty cp0 = cm1.vars.get(0);
+        Assert.assertEquals(cp0.getDataType(), "java.math.BigDecimal");
+    }
 
     @Test
     public void handleUseJakartaEeTrue() {

modules/openapi-generator/src/test/resources/3_0/kotlin/issue-enum-bigdecimal-value.yml

@@ -0,0 +1,26 @@
+openapi: 3.0.0
+info:
+  title: 'Issue enum wrong type'
+  version: latest
+paths:
+  '/':
+    get:
+      operationId: operation
+      responses:
+        '200':
+          description: Success
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ModelWithEnumBigDecimalValue'
+components:
+  schemas:
+    ModelWithEnumBigDecimalValue:
+      properties:
+        mode:
+          type: number
+          enum:
+            - -1
+            - 0
+            - 1.1
+            - 0.4

samples/client/petstore/kotlin-enum-bigdecimal-value/docs/ModelWithEnumBigDecimalValue.md

@@ -0,0 +1,17 @@
+
+# ModelWithEnumBigDecimalValue
+
+## Properties
+| Name | Type | Description | Notes |
+| ------------ | ------------- | ------------- | ------------- |
+| **mode** | [**inline**](#Mode) |  |  [optional] |
+
+
+<a id="Mode"></a>
+## Enum: mode
+| Name | Value |
+| ---- | ----- |
+| mode | -1, 0, 1.1, 0.4 |
+
+
+

samples/client/petstore/kotlin-enum-bigdecimal-value/src/main/kotlin/org/openapitools/client/models/ModelWithEnumBigDecimalValue.kt

@@ -0,0 +1,48 @@
+/**
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ *
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.models
+
+
+import com.google.gson.annotations.SerializedName
+
+/**
+ * 
+ *
+ * @param mode 
+ */
+
+
+data class ModelWithEnumBigDecimalValue (
+
+    @SerializedName("mode")
+    val mode: ModelWithEnumBigDecimalValue.Mode? = null
+
+) {
+
+    /**
+     * 
+     *
+     * Values: Minus1,_0,_1Period1,_0Period4
+     */
+    enum class Mode(val value: java.math.BigDecimal) {
+        @SerializedName(value = "-1.toBigDecimal()") Minus1(-1.toBigDecimal()),
+        @SerializedName(value = "0.toBigDecimal()") _0(0.toBigDecimal()),
+        @SerializedName(value = "1.1.toBigDecimal()") _1Period1(1.1.toBigDecimal()),
+        @SerializedName(value = "0.4.toBigDecimal()") _0Period4(0.4.toBigDecimal());
+    }
+
+}
+

samples/client/petstore/kotlin-enum-bigdecimal-value/src/test/kotlin/org/openapitools/client/models/ModelWithEnumBigDecimalValueTest.kt

@@ -0,0 +1,35 @@
+/**
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ *
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.models
+
+import io.kotlintest.shouldBe
+import io.kotlintest.specs.ShouldSpec
+
+import org.openapitools.client.models.ModelWithEnumBigDecimalValue
+
+class ModelWithEnumBigDecimalValueTest : ShouldSpec() {
+    init {
+        // uncomment below to create an instance of ModelWithEnumBigDecimalValue
+        //val modelInstance = ModelWithEnumBigDecimalValue()
+
+        // to test the property `mode`
+        should("test mode") {
+            // uncomment below to test the property
+            //modelInstance.mode shouldBe ("TODO")
+        }
+
+    }
+}