Fix allOf with a single item in inline model resolver

bin/utils/test_file_list.yaml

@@ -10,7 +10,7 @@
 - filename: "samples/client/petstore/java/okhttp-gson/src/test/java/org/openapitools/client/ClientTest.java"
   sha256: db505f7801fef62c13a08a8e9ca1fc4c5c947ab46b46f12943139d353feacf17
 - filename: "samples/client/petstore/java/okhttp-gson/src/test/java/org/openapitools/client/JSONTest.java"
-  sha256: 6db714e9744c150c8982c3cb18e4f37a9c1ecd8f72f6d58943986e781ab4a344
+  sha256: 7b9514ac0b3730685590d6ef273b2c2a1fb72d968529c2423a139ee9b0b92a65
 - filename: "samples/client/petstore/java/okhttp-gson/src/test/java/org/openapitools/client/api/PetApiTest.java"
   sha256: 0d64cdc11809a7b5b952ccdad2bd91bd0045b3894d6fabf3e368fa0be12b8217
 - filename: "samples/client/petstore/java/okhttp-gson/src/test/java/org/openapitools/client/model/PetTest.java"

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

@@ -851,13 +851,21 @@ private void flattenProperties(OpenAPI openAPI, Map<String, Schema> properties,
                 } else {
                     LOGGER.debug("Schema not yet handled in model resolver: {}", inner);
                 }
-            } else if (ModelUtils.isComposedSchema(property)) { // oneOf, anyOf, etc
-                String propertyModelName = resolveModelName(property.getTitle(), path + "_" + key);
-                gatherInlineModels(property, propertyModelName);
-                propertyModelName = addSchemas(propertyModelName, property);
-                Schema schema = new Schema().$ref(propertyModelName);
-                schema.setRequired(property.getRequired());
-                propsToUpdate.put(key, schema);
+            } else if (ModelUtils.isComposedSchema(property)) { // oneOf, anyOf, allOf etc
+                if (property.getAllOf() != null && property.getAllOf().size() == 1 // allOf with a single item
+                        && (property.getOneOf() == null || property.getOneOf().isEmpty()) // not oneOf
+                        && (property.getAnyOf() == null || property.getAnyOf().isEmpty()) // not anyOf
+                        && (property.getProperties() == null || property.getProperties().isEmpty())) { // no property
+                    // don't do anything if it's allOf with a single item
+                    LOGGER.debug("allOf with a single item (which can be handled by default codegen) skipped by inline model resolver: {}", property);
+                } else {
+                    String propertyModelName = resolveModelName(property.getTitle(), path + "_" + key);
+                    gatherInlineModels(property, propertyModelName);
+                    propertyModelName = addSchemas(propertyModelName, property);
+                    Schema schema = new Schema().$ref(propertyModelName);
+                    schema.setRequired(property.getRequired());
+                    propsToUpdate.put(key, schema);
+                }
             } else {
                 LOGGER.debug("Schema not yet handled in model resolver: {}", property);
             }

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

@@ -2544,3 +2544,41 @@ components:
                   oneOf:
                   - $ref: '#/components/schemas/Pet'
                   - $ref: '#/components/schemas/Order'
+    PetUsingAllOf:
+      type: object
+      required:
+        - name
+        - photoUrls
+      properties:
+        id:
+          type: integer
+          format: int64
+          x-is-unique: true
+        category:
+          allOf:
+            - $ref: '#/components/schemas/Category'
+        name:
+          type: string
+          example: doggie
+        photoUrls:
+          type: array
+          xml:
+            name: photoUrl
+            wrapped: true
+          items:
+            type: string
+        tags:
+          type: array
+          xml:
+            name: tag
+            wrapped: true
+          items:
+            allOf:
+            - $ref: '#/components/schemas/Tag'
+        status:
+          type: string
+          description: pet status in the store
+          enum:
+            - available
+            - pending
+            - sold

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

@@ -78,6 +78,7 @@ docs/OuterEnumIntegerDefaultValue.md
 docs/ParentPet.md
 docs/Pet.md
 docs/PetApi.md
+docs/PetUsingAllOf.md
 docs/PetWithRequiredTags.md
 docs/Pig.md
 docs/PropertyNameCollision.md
@@ -210,6 +211,7 @@ src/main/java/org/openapitools/client/model/OuterEnumInteger.java
 src/main/java/org/openapitools/client/model/OuterEnumIntegerDefaultValue.java
 src/main/java/org/openapitools/client/model/ParentPet.java
 src/main/java/org/openapitools/client/model/Pet.java
+src/main/java/org/openapitools/client/model/PetUsingAllOf.java
 src/main/java/org/openapitools/client/model/PetWithRequiredTags.java
 src/main/java/org/openapitools/client/model/Pig.java
 src/main/java/org/openapitools/client/model/PropertyNameCollision.java

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

@@ -232,6 +232,7 @@ Class | Method | HTTP request | Description
  - [OuterEnumIntegerDefaultValue](docs/OuterEnumIntegerDefaultValue.md)
  - [ParentPet](docs/ParentPet.md)
  - [Pet](docs/Pet.md)
+ - [PetUsingAllOf](docs/PetUsingAllOf.md)
  - [PetWithRequiredTags](docs/PetWithRequiredTags.md)
  - [Pig](docs/Pig.md)
  - [PropertyNameCollision](docs/PropertyNameCollision.md)

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

@@ -2527,6 +2527,44 @@ components:
           attributes:
             $ref: '#/components/schemas/AllOfModelArrayAnyOf_allOf_attributes'
         type: object
+    PetUsingAllOf:
+      properties:
+        id:
+          format: int64
+          type: integer
+          x-is-unique: true
+        category:
+          allOf:
+          - $ref: '#/components/schemas/Category'
+        name:
+          example: doggie
+          type: string
+        photoUrls:
+          items:
+            type: string
+          type: array
+          xml:
+            name: photoUrl
+            wrapped: true
+        tags:
+          items:
+            allOf:
+            - $ref: '#/components/schemas/Tag'
+          type: array
+          xml:
+            name: tag
+            wrapped: true
+        status:
+          description: pet status in the store
+          enum:
+          - available
+          - pending
+          - sold
+          type: string
+      required:
+      - name
+      - photoUrls
+      type: object
     _foo_get_default_response:
       example:
         string:

samples/client/petstore/java/okhttp-gson/docs/PetUsingAllOf.md

@@ -0,0 +1,28 @@
+
+
+# PetUsingAllOf
+
+
+## Properties
+
+| Name | Type | Description | Notes |
+|------------ | ------------- | ------------- | -------------|
+|**id** | **Long** |  |  [optional] |
+|**category** | [**Category**](Category.md) |  |  [optional] |
+|**name** | **String** |  |  |
+|**photoUrls** | **List<String>** |  |  |
+|**tags** | [**List<Tag>**](Tag.md) |  |  [optional] |
+|**status** | [**StatusEnum**](#StatusEnum) | pet status in the store |  [optional] |
+
+
+
+## Enum: StatusEnum
+
+| Name | Value |
+|---- | -----|
+| AVAILABLE | "available" |
+| PENDING | "pending" |
+| SOLD | "sold" |
+
+
+

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/JSON.java

@@ -297,6 +297,7 @@ private static Class getClassByDiscriminator(Map classByDiscriminatorValue, Stri
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.OuterComposite.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.ParentPet.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.Pet.CustomTypeAdapterFactory());
+        gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.PetUsingAllOf.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.PetWithRequiredTags.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.Pig.CustomTypeAdapterFactory());
         gsonBuilder.registerTypeAdapterFactory(new org.openapitools.client.model.PropertyNameCollision.CustomTypeAdapterFactory());