[php-nextgen] Discriminator class detection uses wrong namespace

modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache

@@ -499,7 +499,7 @@ class ObjectSerializer
             // If a discriminator is defined and points to a valid subclass, use it.
             $discriminator = $class::DISCRIMINATOR;
             if (!empty($discriminator) && isset($data->{$discriminator}) && is_string($data->{$discriminator})) {
-                $subclass = '\{{invokerPackage}}\Model\\' . $data->{$discriminator};
+                $subclass = '\{{modelPackage}}\\' . $data->{$discriminator};
                 if (is_subclass_of($subclass, $class)) {
                     $class = $subclass;
                 }

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

@@ -120,6 +120,45 @@ public void testEnumUnknownDefaultCaseDeserializationEnabled() throws Exception
         Assert.assertListNotContains(modelContent, a -> a.equals("\"Invalid value '%s' for 'color', must be one of '%s'\","), "");
     }
 
+    @Test
+    public void testDiscriminatorUsesModelPackageNamespace() throws Exception {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/3_0/php-nextgen/petstore-with-fake-endpoints-models-for-testing.yaml", null, new ParseOptions()).getOpenAPI();
+
+        codegen.setOutputDir(output.getAbsolutePath());
+        // Set invokerPackage="MyApp" and modelPackage="Entities" (relative suffix).
+        // AbstractPhpCodegen.processOpts() will produce final modelPackage = "MyApp\Entities".
+        // The old bug would have emitted '\MyApp\Model\' (invokerPackage + \Model\).
+        codegen.additionalProperties().put(CodegenConstants.INVOKER_PACKAGE, "MyApp");
+        codegen.additionalProperties().put(CodegenConstants.MODEL_PACKAGE, "Entities");
+
+        ClientOptInput input = new ClientOptInput()
+                .openAPI(openAPI)
+                .config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        Map<String, File> files = generator.opts(input).generate().stream()
+                .collect(Collectors.toMap(File::getName, Function.identity()));
+
+        List<String> objectSerializerContent = Files
+                .readAllLines(files.get("ObjectSerializer.php").toPath())
+                .stream()
+                .map(String::trim)
+                .collect(Collectors.toList());
+
+        // The discriminator subclass lookup must use modelPackage (\MyApp\Entities\),
+        // NOT invokerPackage + '\Model' (\MyApp\Model\).
+        Assert.assertListContains(objectSerializerContent,
+                a -> a.contains("'\\MyApp\\Entities\\\\'"),
+                "ObjectSerializer discriminator subclass lookup must use modelPackage namespace");
+        Assert.assertListNotContains(objectSerializerContent,
+                a -> a.contains("'\\MyApp\\Model\\\\'"),
+                "ObjectSerializer discriminator must NOT use invokerPackage\\Model namespace");
+    }
+
     @Test
     public void testEnumUnknownDefaultCaseDeserializationDisabled() throws Exception {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();

modules/openapi-generator/src/test/resources/3_0/php-nextgen/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -2291,3 +2291,22 @@ components:
           description: "Optional array of multiple errors encountered during processing"
       required:
         - error
+
+    DiscriminatorBase:
+      type: object
+      discriminator:
+        propertyName: type
+      required:
+        - type
+      properties:
+        type:
+          type: string
+
+    DiscriminatorChild:
+      allOf:
+        - $ref: '#/components/schemas/DiscriminatorBase'
+        - type: object
+          properties:
+            childProperty:
+              type: string
+

samples/client/petstore/php-nextgen/OpenAPIClient-php/.openapi-generator/FILES

@@ -25,6 +25,8 @@ docs/Model/ChildWithNullable.md
 docs/Model/ClassModel.md
 docs/Model/Client.md
 docs/Model/DeprecatedObject.md
+docs/Model/DiscriminatorBase.md
+docs/Model/DiscriminatorChild.md
 docs/Model/Dog.md
 docs/Model/EnumArrays.md
 docs/Model/EnumClass.md
@@ -91,6 +93,8 @@ src/Model/ChildWithNullable.php
 src/Model/ClassModel.php
 src/Model/Client.php
 src/Model/DeprecatedObject.php
+src/Model/DiscriminatorBase.php
+src/Model/DiscriminatorChild.php
 src/Model/Dog.php
 src/Model/EnumArrays.php
 src/Model/EnumClass.php

samples/client/petstore/php-nextgen/OpenAPIClient-php/README.md

@@ -142,6 +142,8 @@ Class | Method | HTTP request | Description
 - [ClassModel](docs/Model/ClassModel.md)
 - [Client](docs/Model/Client.md)
 - [DeprecatedObject](docs/Model/DeprecatedObject.md)
+- [DiscriminatorBase](docs/Model/DiscriminatorBase.md)
+- [DiscriminatorChild](docs/Model/DiscriminatorChild.md)
 - [Dog](docs/Model/Dog.md)
 - [EnumArrays](docs/Model/EnumArrays.md)
 - [EnumClass](docs/Model/EnumClass.md)

samples/client/petstore/php-nextgen/OpenAPIClient-php/docs/Model/DiscriminatorBase.md

@@ -0,0 +1,9 @@
+# # DiscriminatorBase
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**type** | **string** |  |
+
+[[Back to Model list]](../../README.md#models) [[Back to API list]](../../README.md#endpoints) [[Back to README]](../../README.md)

samples/client/petstore/php-nextgen/OpenAPIClient-php/docs/Model/DiscriminatorChild.md

@@ -0,0 +1,9 @@
+# # DiscriminatorChild
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**child_property** | **string** |  | [optional]
+
+[[Back to Model list]](../../README.md#models) [[Back to API list]](../../README.md#endpoints) [[Back to README]](../../README.md)