better handling of api response

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

@@ -4331,7 +4331,7 @@ public class DefaultCodegen implements CodegenConfig {
         if (code == null) {
             return null;
         }
-        return responses.get(code);
+        return ModelUtils.getReferencedApiResponse(openAPI, responses.get(code));
     }
 
     /**
@@ -4363,7 +4363,8 @@ public class DefaultCodegen implements CodegenConfig {
                                         CodegenOperation op,
                                         ApiResponse methodResponse,
                                         Map<String, String> schemaMappings) {
-        Schema responseSchema = unaliasSchema(ModelUtils.getSchemaFromResponse(openAPI, methodResponse));
+        ApiResponse response = ModelUtils.getReferencedApiResponse(openAPI, methodResponse);
+        Schema responseSchema = unaliasSchema(ModelUtils.getSchemaFromResponse(openAPI, response));
 
         if (responseSchema != null) {
             CodegenProperty cm = fromProperty("response", responseSchema, false);
@@ -4416,7 +4417,7 @@ public class DefaultCodegen implements CodegenConfig {
             }
             op.returnProperty = cm;
         }
-        addHeaders(methodResponse, op.responseHeaders);
+        addHeaders(response, op.responseHeaders);
     }
 
     /**
@@ -4482,7 +4483,7 @@ public class DefaultCodegen implements CodegenConfig {
             ApiResponse methodResponse = findMethodResponse(operation.getResponses());
             for (Map.Entry<String, ApiResponse> operationGetResponsesEntry : operation.getResponses().entrySet()) {
                 String key = operationGetResponsesEntry.getKey();
-                ApiResponse response = operationGetResponsesEntry.getValue();
+                ApiResponse response = ModelUtils.getReferencedApiResponse(openAPI, operationGetResponsesEntry.getValue());
                 addProducesInfo(response, op);
                 CodegenResponse r = fromResponse(key, response);
                 Map<String, Header> headers = response.getHeaders();
@@ -4552,9 +4553,10 @@ public class DefaultCodegen implements CodegenConfig {
             List<Map<String, String>> examples = new ArrayList<>();
 
             for (String statusCode : operation.getResponses().keySet()) {
-                ApiResponse apiResponse = operation.getResponses().get(statusCode);
+                ApiResponse apiResponse = ModelUtils.getReferencedApiResponse(openAPI, operation.getResponses().get(statusCode));
                 Schema schema = unaliasSchema(ModelUtils.getSchemaFromResponse(openAPI, apiResponse));
                 if (schema == null) {
+                    // void response
                     continue;
                 }
 
@@ -5142,7 +5144,7 @@ public class DefaultCodegen implements CodegenConfig {
             parameterModelName = getParameterDataType(parameter, parameterSchema);
             CodegenProperty prop;
             if (this instanceof RustServerCodegen) {
-                // for rust server, we need to do somethings special as it uses
+                // for rust server, we need to do something special as it uses
                 // $ref (e.g. #components/schemas/Pet) to determine whether it's a model
                 prop = fromProperty(parameter.getName(), parameterSchema, false);
             } else if (getUseInlineModelResolver()) {

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/K6ClientCodegen.java

@@ -587,7 +587,7 @@ public class K6ClientCodegen extends DefaultCodegen implements CodegenConfig {
                     }
 
                     for (Map.Entry<String, ApiResponse> responseEntry : operation.getResponses().entrySet()) {
-                        CodegenResponse r = fromResponse(responseEntry.getKey(), responseEntry.getValue());
+                        CodegenResponse r = fromResponse(responseEntry.getKey(), ModelUtils.getReferencedApiResponse(openAPI, responseEntry.getValue()));
                         if (r.baseType != null &&
                                 !defaultIncludes.contains(r.baseType) &&
                                 !languageSpecificPrimitives.contains(r.baseType)) {
@@ -1056,6 +1056,7 @@ public class K6ClientCodegen extends DefaultCodegen implements CodegenConfig {
      * @return true if should be hidden, false otherwise
      */
     private boolean shouldHideOperationResponse(ApiResponse resp) {
+        resp = ModelUtils.getReferencedApiResponse(openAPI, resp);
         boolean hideOperationResponse = false;
 
         if (Objects.nonNull(resp.getExtensions()) && !resp.getExtensions().isEmpty()

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

@@ -345,7 +345,7 @@ public class OCamlClientCodegen extends DefaultCodegen implements CodegenConfig
             if (operation.getResponses() != null) {
                 for (Map.Entry<String, ApiResponse> operationGetResponsesEntry : operation.getResponses().entrySet()) {
                     String s = operationGetResponsesEntry.getKey();
-                    ApiResponse apiResponse = operationGetResponsesEntry.getValue();
+                    ApiResponse apiResponse = ModelUtils.getReferencedApiResponse(openAPI, operationGetResponsesEntry.getValue());
                     if (apiResponse.getContent() != null) {
                         Content content = apiResponse.getContent();
                         for (String p : content.keySet()) {

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

@@ -475,6 +475,7 @@ public class RustAxumServerCodegen extends AbstractRustCodegen implements Codege
             } else {
                 original = operation.getResponses().get(rsp.code);
             }
+            original = ModelUtils.getReferencedApiResponse(openAPI, original);
 
             // Create a unique responseID for this response, if one is not already specified with the "x-response-id" extension
             if (!rsp.vendorExtensions.containsKey("x-response-id")) {

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

@@ -656,6 +656,7 @@ public class RustServerCodegen extends AbstractRustCodegen implements CodegenCon
             } else {
                 original = operation.getResponses().get(rsp.code);
             }
+            original = ModelUtils.getReferencedApiResponse(openAPI, original);
             String[] words = rsp.message.split("[^A-Za-z ]");
 
             // Create a unique responseID for this response.