fix: ExampleGenerator for composed child schemas and array schemas (#18479)

* fix: ExampleGenerator for composed child schemas and array schemas correctly

* fix: refactor to remove code duplication

* fix: fixes test assertion encoding

* fix: adds doc to new method

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

@@ -19,7 +19,6 @@ package org.openapitools.codegen.examples;
 
 import io.swagger.v3.core.util.Json;
 import io.swagger.v3.oas.models.OpenAPI;
-import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.utils.ModelUtils;
@@ -364,17 +363,7 @@ public class ExampleGenerator {
             return schema.getExample();
         } else if (ModelUtils.isAllOf(schema) || ModelUtils.isAllOfWithProperties(schema)) {
             LOGGER.debug("Resolving allOf model '{}' to example", name);
-            List<Schema> interfaces = schema.getAllOf();
+            resolveAllOfSchemaProperties(mediaType, schema, processedModels, values);
-            for (Schema composed : interfaces) {
-                traverseSchemaProperties(mediaType, composed, processedModels, values);
-                if (composed.get$ref() != null) {
-                    String ref = ModelUtils.getSimpleRef(composed.get$ref());
-                    Schema resolved = ModelUtils.getSchema(openAPI, ref);
-                    if (resolved != null) {
-                        traverseSchemaProperties(mediaType, resolved, processedModels, values);
-                    }
-                }
-            }
             schema.setExample(values);
             return schema.getExample();
         } else if (ModelUtils.isAnyOf(schema) || ModelUtils.isOneOf(schema)) {
@@ -388,6 +377,8 @@ public class ExampleGenerator {
                 return null;
             }
             return resolvePropertyToExample(name, mediaType, found.get(), processedModels);
+        } else if (ModelUtils.isArraySchema(schema)) {
+            return resolvePropertyToExample(schema.getName(), mediaType, schema, processedModels);
         } else {
             // TODO log an error message as the model does not have any properties
             return null;
@@ -400,6 +391,29 @@ public class ExampleGenerator {
                 Schema property = (Schema) schema.getProperties().get(propertyName.toString());
                 values.put(propertyName.toString(), resolvePropertyToExample(propertyName.toString(), mediaType, property, processedModels));
             }
+        } else if (ModelUtils.isAllOf(schema) || ModelUtils.isAllOfWithProperties(schema)) {
+            resolveAllOfSchemaProperties(mediaType, schema, processedModels, values);
+        }
+    }
+
+    /**
+     * Transverse and resolves all property examples for `allOf` composed schemas into `values` map object
+     * @param mediaType MIME type
+     * @param schema OAS schema
+     * @param processedModels Set containing all processed models
+     * @param values Example value map
+     */
+    private void resolveAllOfSchemaProperties(String mediaType, Schema schema, Set<String> processedModels, Map<String, Object> values) {
+        List<Schema> interfaces = schema.getAllOf();
+        for (Schema composed : interfaces) {
+            traverseSchemaProperties(mediaType, composed, processedModels, values);
+            if (composed.get$ref() != null) {
+                String ref = ModelUtils.getSimpleRef(composed.get$ref());
+                Schema resolved = ModelUtils.getSchema(openAPI, ref);
+                if (resolved != null) {
+                    traverseSchemaProperties(mediaType, resolved, processedModels, values);
+                }
+            }
         }
     }
 

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

@@ -152,6 +152,35 @@ public class ExampleGeneratorTest {
         assertEquals("200", examples.get(0).get("statusCode"));
     }
 
+    @Test
+    public void generateFromResponseSchemaWithArraySchema() {
+        OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/example_generator_test.yaml");
+
+        new InlineModelResolver().flatten(openAPI);
+
+        ExampleGenerator exampleGenerator = new ExampleGenerator(openAPI.getComponents().getSchemas(), openAPI);
+        Set<String> mediaTypeKeys = new TreeSet<>();
+        mediaTypeKeys.add("application/json");
+        List<Map<String, String>> examples = exampleGenerator.generateFromResponseSchema(
+                "200",
+                openAPI
+                        .getPaths()
+                        .get("/generate_from_response_schema_array_reference")
+                        .getGet()
+                        .getResponses()
+                        .get("200")
+                        .getContent()
+                        .get("application/json")
+                        .getSchema(),
+                mediaTypeKeys
+        );
+
+        assertEquals(1, examples.size());
+        assertEquals("application/json", examples.get(0).get("contentType"));
+        assertEquals(String.format(Locale.ROOT, "[ {%n  \"example_schema_property\" : \"example schema property value\"%n}, {%n  \"example_schema_property\" : \"example schema property value\"%n} ]"), examples.get(0).get("example"));
+        assertEquals("200", examples.get(0).get("statusCode"));
+    }
+
     @Test
     public void generateFromResponseSchemaWithModel() {
         OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/example_generator_test.yaml");
@@ -210,6 +239,35 @@ public class ExampleGeneratorTest {
         assertEquals("200", examples.get(0).get("statusCode"));
     }
 
+    @Test
+    public void generateFromResponseSchemaWithAllOfChildComposedModel() {
+        OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/example_generator_test.yaml");
+
+        new InlineModelResolver().flatten(openAPI);
+
+        ExampleGenerator exampleGenerator = new ExampleGenerator(openAPI.getComponents().getSchemas(), openAPI);
+        Set<String> mediaTypeKeys = new TreeSet<>();
+        mediaTypeKeys.add("application/json");
+        List<Map<String, String>> examples = exampleGenerator.generateFromResponseSchema(
+                "200",
+                openAPI
+                        .getPaths()
+                        .get("/generate_from_response_schema_with_allOf_child_composed_model")
+                        .getGet()
+                        .getResponses()
+                        .get("200")
+                        .getContent()
+                        .get("application/json")
+                        .getSchema(),
+                mediaTypeKeys
+        );
+
+        assertEquals(1, examples.size());
+        assertEquals("application/json", examples.get(0).get("contentType"));
+        assertEquals(String.format(Locale.ROOT, "{%n  \"example_schema_property_composed\" : \"example schema property value composed\",%n  \"example_schema_property_composed_parent\" : \"example schema property value composed parent\",%n  \"example_schema_property\" : \"example schema property value\"%n}"), examples.get(0).get("example"));
+        assertEquals("200", examples.get(0).get("statusCode"));
+    }
+
     @Test
     public void generateFromResponseSchemaWithOneOfComposedModel() {
         OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/example_generator_test.yaml");

modules/openapi-generator/src/test/resources/3_0/example_generator_test.yaml

@@ -61,6 +61,16 @@ paths:
                 items:
                   type: string
                   example: primitive types example value
+  /generate_from_response_schema_array_reference:
+    get:
+      operationId: generateFromResponseSchemaArrayReference
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExampleArraySchema'
   /generate_from_response_schema_with_model:
     get:
       operationId: generateFromResponseSchemaWithModel
@@ -81,6 +91,16 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/ExampleAllOfSchema'
+  /generate_from_response_schema_with_allOf_child_composed_model:
+    get:
+      operationId: generateFromResponseSchemaWithAllOfModel
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ExampleAllOfParentSchema'
   /generate_from_response_schema_with_anyOf_composed_model:
     get:
       operationId: generateFromResponseSchemaWithAnyOfModel
@@ -131,6 +151,15 @@ components:
             example_schema_property_composed:
               type: string
               example: example schema property value composed
+    ExampleAllOfParentSchema:
+      type: object
+      allOf:
+        - $ref: '#/components/schemas/ExampleAllOfSchema'
+        - type: object
+          properties:
+            example_schema_property_composed_parent:
+              type: string
+              example: example schema property value composed parent
     ExampleAnyOfSchema:
       type: object
       anyOf:
@@ -149,3 +178,7 @@ components:
             example_schema_property_composed:
               type: string
               example: example schema property value composed
+    ExampleArraySchema:
+      type: array
+      items:
+        $ref: '#/components/schemas/ExampleSchema'

samples/client/petstore/csharp/generichost/net8/FormModels/api/openapi.yaml

@@ -1247,6 +1247,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2714,6 +2718,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/generichost/net8/Petstore/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/generichost/net8/SourceGeneration/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/generichost/standard2.0/Petstore/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/httpclient/standard2.0/Petstore/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/net4.7/Petstore/api/openapi.yaml

@@ -1304,6 +1304,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2894,6 +2898,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/net4.8/Petstore/api/openapi.yaml

@@ -1304,6 +1304,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2894,6 +2898,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/net7/EnumMappings/api/openapi.yaml

@@ -1304,6 +1304,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2894,6 +2898,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/net7/Petstore/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/restsharp/standard2.0/Petstore/api/openapi.yaml

@@ -1304,6 +1304,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2894,6 +2898,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string

samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/api/openapi.yaml

@@ -1278,6 +1278,10 @@ components:
       type: array
     RolesReportsHash:
       description: Role report Hash
+      example:
+        role:
+          name: name
+        role_uuid: 046b6c7f-0b8a-43b9-b35d-6489e6daee91
       properties:
         role_uuid:
           format: uuid
@@ -2862,6 +2866,8 @@ components:
         - country
         type: object
     RolesReportsHash_role:
+      example:
+        name: name
       properties:
         name:
           type: string