Better handling of parameters in inline model resolver (#19460)

* add tests for parameter ref of oneOf

* update samples

* better handlding of parameters in inline model resolver

Author: wing328

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

@@ -141,11 +141,15 @@ private void flattenPaths() {
                 }
             }
 
+            // flatten path-level parameters
+            flattenParameters(pathname, path.getParameters(), null);
+
+            // flatten parameters for each operation
             for (Map.Entry<HttpMethod, Operation> operationEntry : toFlatten) {
                 Operation operation = operationEntry.getValue();
                 String inlineSchemaName = this.getInlineSchemaName(operationEntry.getKey(), pathname);
                 flattenRequestBody(inlineSchemaName, operation);
-                flattenParameters(inlineSchemaName, operation);
+                flattenParameters(inlineSchemaName, operation.getParameters(), operation.getOperationId());
                 flattenResponses(inlineSchemaName, operation);
             }
         }
@@ -509,15 +513,20 @@ private void flattenRequestBody(String modelName, Operation operation) {
      * Flatten inline models in parameters
      *
      * @param modelName model name
-     * @param operation target operation
+     * @param parameters list of parameters
+     * @param operationId operation Id (optional)
      */
-    private void flattenParameters(String modelName, Operation operation) {
-        List<Parameter> parameters = operation.getParameters();
+    private void flattenParameters(String modelName, List<Parameter> parameters, String operationId) {
+        //List<Parameter> parameters = operation.getParameters();
         if (parameters == null) {
             return;
         }
 
         for (Parameter parameter : parameters) {
+            if (StringUtils.isNotEmpty(parameter.get$ref())) {
+                parameter = ModelUtils.getReferencedParameter(openAPI, parameter);
+            }
+
             if (parameter.getSchema() == null) {
                 continue;
             }
@@ -528,7 +537,7 @@ private void flattenParameters(String modelName, Operation operation) {
                 continue;
             }
             String schemaName = resolveModelName(parameterSchema.getTitle(),
-                    (operation.getOperationId() == null ? modelName : operation.getOperationId()) + "_" + parameter.getName() + "_parameter");
+                    (operationId == null ? modelName : operationId) + "_" + parameter.getName() + "_parameter");
             // Recursively gather/make inline models within this schema if any
             gatherInlineModels(parameterSchema, schemaName);
             if (isModelNeeded(parameterSchema)) {

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

@@ -411,9 +411,7 @@ private void normalizeParameters(List<Parameter> parameters) {
                 parameter = ModelUtils.getReferencedParameter(openAPI, parameter);
             }
 
-            if (parameter.getSchema() == null) {
-                continue;
-            } else {
+            if (parameter.getSchema() != null) {
                 Schema newSchema = normalizeSchema(parameter.getSchema(), new HashSet<>());
                 parameter.setSchema(newSchema);
             }

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

@@ -704,7 +704,7 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
                             propertyHash.put(property.name, property);
                             final CodegenProperty parentVar = property.clone();
                             parentVar.isInherited = true;
-                            LOGGER.info("adding parent variable {} to {}", property.name, codegenModel.name);
+                            LOGGER.debug("adding parent variable {} to {}", property.name, codegenModel.name);
                             codegenModel.parentVars.add(parentVar);
                             Set<String> imports = parentVar.getImports(true, this.importBaseType, generatorMetadata.getFeatureSet()).stream().filter(Objects::nonNull).collect(Collectors.toSet());
                             for (String imp : imports) {

modules/openapi-generator/src/test/resources/3_0/java/petstore-with-fake-endpoints-models-for-testing-okhttp-gson.yaml

@@ -1340,7 +1340,7 @@ paths:
     post:
       tags:
         - fake
-      summary: fake uploads an image with ref request bodies
+      summary: fake reference parameter
       description: ''
       operationId: fake-upload-ref-request-bodies
       parameters:
@@ -1364,7 +1364,18 @@ paths:
             - 'read:pets'
       requestBody:
         $ref: '#/components/requestBodies/upload_body'
-
+  '/fake/pet/{petId}/reference/parameter':
+    post:
+      tags:
+        - fake
+      summary: fake reference parameter
+      description: ''
+      operationId: fake-ref-parameter
+      parameters:
+        - $ref: '#/components/parameters/pet_id'
+      responses:
+        '200':
+          description: successful operation
   /values:
     get:
       tags:
@@ -1423,6 +1434,16 @@ servers:
   - url: https://127.0.0.1/no_variable
     description: The local server without variables
 components:
+  parameters:
+    pet_id:
+      name: petId
+      in: path
+      description: to test oneOf in parameter $ref
+      required: true
+      schema:
+        oneOf:
+          - type: string
+          - type: integer
   requestBodies:
     upload_body:
       content:

modules/openapi-generator/src/test/resources/3_1/java/petstore.yaml

@@ -609,6 +609,28 @@ paths:
           $ref: '#/components/responses/ref'
     parameters:
       - $ref: '#/components/parameters/ref_to_uuid'
+  /ref/ref_to_path_level_parameter_oneof:
+    get:
+      description: to test $ref to path level parameters
+      operationId: ref_to_ref_parameter_oneof
+      tags:
+        - fake
+      responses:
+        '200':
+          description: Successful Response
+    parameters:
+      - $ref: '#/components/parameters/ref_to_oneof'
+  /ref/ref_to_operation_level_parameter_oneof:
+    get:
+      description: to test $ref to operation level parameters
+      operationId: ref_to_ref_parameter_anyof
+      tags:
+        - fake
+      responses:
+        '200':
+          description: Successful Response
+      parameters:
+        - $ref: '#/components/parameters/ref_to_anyof'
   "/fake/api/changeowner":
     post:
       summary: op1
@@ -720,6 +742,26 @@ components:
         type: string
         format: uuid
         example: 61864654-6e6b-4152-a62f-795fdd606bc2
+    ref_to_oneof:
+      description: to test ref to parameter (oneof)
+      name: ref_to_oneof
+      in: header
+      required: true
+      schema:
+        oneOf:
+          - type: string
+          - type: integer
+    ref_to_anyof:
+      description: to test ref to parameter (anyof)
+      name: ref_to_anyof
+      in: header
+      required: true
+      schema:
+        oneOf:
+          - type: string
+          - type: array
+            items:
+              type: string
   requestBodies:
     UserArray:
       content:
@@ -1023,4 +1065,4 @@ components:
       allOf:
         - $ref: '#/components/schemas/SimpleModelWithArrayProperty'
     myObject:
-      type: object
+      type: object

samples/client/petstore/java/okhttp-gson-3.1/.openapi-generator/FILES

@@ -22,6 +22,8 @@ docs/OneOfStringOrInt.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
+docs/RefRefToPathLevelParameterOneofRefToOneofParameter.md
+docs/RefToRefParameterAnyofRefToAnyofParameter.md
 docs/SimpleModelWithArrayProperty.md
 docs/StoreApi.md
 docs/StringOrInt.md
@@ -78,6 +80,8 @@ src/main/java/org/openapitools/client/model/ModelApiResponse.java
 src/main/java/org/openapitools/client/model/OneOfStringOrInt.java
 src/main/java/org/openapitools/client/model/Order.java
 src/main/java/org/openapitools/client/model/Pet.java
+src/main/java/org/openapitools/client/model/RefRefToPathLevelParameterOneofRefToOneofParameter.java
+src/main/java/org/openapitools/client/model/RefToRefParameterAnyofRefToAnyofParameter.java
 src/main/java/org/openapitools/client/model/SimpleModelWithArrayProperty.java
 src/main/java/org/openapitools/client/model/StringOrInt.java
 src/main/java/org/openapitools/client/model/Tag.java

samples/client/petstore/java/okhttp-gson-3.1/README.md

@@ -120,6 +120,8 @@ Class | Method | HTTP request | Description
 *FakeApi* | [**op2**](docs/FakeApi.md#op2) | **POST** /fake/api/changename | op2
 *FakeApi* | [**op3**](docs/FakeApi.md#op3) | **POST** /fake/api/query/enum | op3
 *FakeApi* | [**refToRefParameter**](docs/FakeApi.md#refToRefParameter) | **GET** /ref/ref_to_parameter | 
+*FakeApi* | [**refToRefParameterAnyof**](docs/FakeApi.md#refToRefParameterAnyof) | **GET** /ref/ref_to_operation_level_parameter_oneof | 
+*FakeApi* | [**refToRefParameterOneof**](docs/FakeApi.md#refToRefParameterOneof) | **GET** /ref/ref_to_path_level_parameter_oneof | 
 *FakeApi* | [**responseNoRef**](docs/FakeApi.md#responseNoRef) | **GET** /no_ref | 
 *FakeApi* | [**responseRefToNoRef**](docs/FakeApi.md#responseRefToNoRef) | **GET** /ref/no_ref | 
 *FakeApi* | [**responseRefToRef**](docs/FakeApi.md#responseRefToRef) | **GET** /ref/ref | 
@@ -162,6 +164,8 @@ Class | Method | HTTP request | Description
  - [OneOfStringOrInt](docs/OneOfStringOrInt.md)
  - [Order](docs/Order.md)
  - [Pet](docs/Pet.md)
+ - [RefRefToPathLevelParameterOneofRefToOneofParameter](docs/RefRefToPathLevelParameterOneofRefToOneofParameter.md)
+ - [RefToRefParameterAnyofRefToAnyofParameter](docs/RefToRefParameterAnyofRefToAnyofParameter.md)
  - [SimpleModelWithArrayProperty](docs/SimpleModelWithArrayProperty.md)
  - [StringOrInt](docs/StringOrInt.md)
  - [Tag](docs/Tag.md)

samples/client/petstore/java/okhttp-gson-3.1/api/openapi.yaml

@@ -687,6 +687,34 @@ paths:
       - text/plain
     parameters:
     - $ref: '#/components/parameters/ref_to_uuid'
+  /ref/ref_to_path_level_parameter_oneof:
+    get:
+      description: to test $ref to path level parameters
+      operationId: ref_to_ref_parameter_oneof
+      parameters:
+      - $ref: '#/components/parameters/ref_to_oneof'
+      responses:
+        "200":
+          description: Successful Response
+      tags:
+      - fake
+      x-accepts:
+      - application/json
+    parameters:
+    - $ref: '#/components/parameters/ref_to_oneof'
+  /ref/ref_to_operation_level_parameter_oneof:
+    get:
+      description: to test $ref to operation level parameters
+      operationId: ref_to_ref_parameter_anyof
+      parameters:
+      - $ref: '#/components/parameters/ref_to_anyof'
+      responses:
+        "200":
+          description: Successful Response
+      tags:
+      - fake
+      x-accepts:
+      - application/json
   /fake/api/changeowner:
     post:
       operationId: op1
@@ -805,6 +833,24 @@ components:
         format: uuid
         type: string
       style: simple
+    ref_to_oneof:
+      description: to test ref to parameter (oneof)
+      explode: false
+      in: header
+      name: ref_to_oneof
+      required: true
+      schema:
+        $ref: '#/components/schemas/_ref_ref_to_path_level_parameter_oneof_ref_to_oneof_parameter'
+      style: simple
+    ref_to_anyof:
+      description: to test ref to parameter (anyof)
+      explode: false
+      in: header
+      name: ref_to_anyof
+      required: true
+      schema:
+        $ref: '#/components/schemas/ref_to_ref_parameter_anyof_ref_to_anyof_parameter'
+      style: simple
   requestBodies:
     UserArray:
       content:
@@ -1134,6 +1180,15 @@ components:
           description: file to upload
           format: binary
           type: string
+    _ref_ref_to_path_level_parameter_oneof_ref_to_oneof_parameter:
+      oneOf:
+      - type: string
+      - type: integer
+    ref_to_ref_parameter_anyof_ref_to_anyof_parameter:
+      oneOf:
+      - type: string
+      - items:
+          type: string
   securitySchemes:
     petstore_auth:
       flows: