fix(go): properly generate inline enums

Author: sruehl

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

@@ -113,6 +113,9 @@ public GoClientCodegen() {
         outputFolder = "generated-code/go";
         embeddedTemplateDir = templateDir = "go";
 
+        // We need inline enums to be resolved to a separate model
+        inlineSchemaOption.put("RESOLVE_INLINE_ENUMS", "true");
+
         apiTemplateFiles.put("api.mustache", ".go");
         modelTemplateFiles.put("model.mustache", ".go");
         apiTestTemplateFiles.put("api_test.mustache", ".go");

modules/openapi-generator/src/test/java/org/openapitools/codegen/go/GoClientCodegenTest.java

@@ -174,7 +174,7 @@ public void testMultipleRequiredPropertiesHasSameOneOfObject() throws IOExceptio
         files.forEach(File::deleteOnExit);
 
         Path docFile = Paths.get(output + "/docs/PetAPI.md");
-        TestUtils.assertFileContains(docFile, "openapiclient.pet{Cat: openapiclient.NewCat(\"Attr_example\")}, openapiclient.pet{Cat: openapiclient.NewCat(\"Attr_example\")}, openapiclient.pet{Cat: openapiclient.NewCat(\"Attr_example\")}");
+        TestUtils.assertFileContains(docFile, "openapiclient.pet{Cat: openapiclient.NewCat(openapiclient.cat_attr(\"CAT\"))}, openapiclient.pet{Cat: openapiclient.NewCat(openapiclient.cat_attr(\"CAT\"))}, openapiclient.pet{Cat: openapiclient.NewCat(openapiclient.cat_attr(\"CAT\"))}");
     }
 
     @Test
@@ -396,4 +396,24 @@ public void testAdditionalPropertiesWithoutGoMod() throws Exception {
         Path goSumFile = Paths.get(output + "/go.sum");
         TestUtils.assertFileNotExists(goSumFile);
     }
+
+    @Test
+    public void testInlineEnums_issue9567() throws Exception {
+        File output = Files.createTempDirectory("test").toFile();
+        output.deleteOnExit();
+
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("go")
+                .setInputSpec("src/test/resources/bugs/issue_9567.yaml")
+                .setOutputDir(output.getAbsolutePath().replace("\\", "/"))
+                .addAdditionalProperty(GoClientCodegen.WITH_GO_MOD, false);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        List<File> files = generator.opts(configurator.toClientOptInput()).generate();
+        System.out.println(files);
+        files.forEach(File::deleteOnExit);
+
+        Path enumFile = Paths.get(output + "/model_pet_status.go");
+        TestUtils.assertFileExists(enumFile);
+    }
 }

modules/openapi-generator/src/test/resources/bugs/issue_9567.yaml

@@ -0,0 +1,36 @@
+openapi: 3.0.1
+info:
+  title: TEST
+  description: |-
+    ## TEST
+  version: 1.0.0
+
+servers:
+  - url: /v3
+    description: Major version of service
+
+paths:
+  /agreements:
+    get:
+      operationId: readAPet
+      responses:
+        "200":
+          description: OK
+          content:
+            '*/*':
+              schema:
+                $ref: '#/components/schemas/Pet'
+components:
+  schemas:
+    Pet:
+      title: a Pet
+      description: A pet for sale in the pet store
+      type: object
+      properties:
+        status:
+          type: string
+          description: pet status in the store
+          enum:
+            - available
+            - pending
+            - sold