fix(metadata): extra properties operation inheritance

src/Metadata/Resource/Factory/AttributesResourceMetadataCollectionFactory.php

@@ -194,6 +194,8 @@ private function getOperationWithDefaults(ApiResource $resource, Operation $oper
             $operation = $operation->{'with'.substr($methodName, 3)}($value);
         }
 
+        $operation = $operation->withExtraProperties(array_merge($resource->getExtraProperties(), $operation->getExtraProperties()));
+
         // Add global defaults attributes to the operation
         $operation = $this->addGlobalDefaults($operation);
 

tests/Fixtures/TestBundle/Entity/ExtraPropertiesResource.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\Entity;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+
+#[ApiResource(
+    extraProperties: ['foo' => 'bar']
+)]
+#[Get]
+final class ExtraPropertiesResource
+{
+}

tests/Metadata/Resource/Factory/AttributesResourceMetadataCollectionFactoryTest.php

@@ -31,6 +31,7 @@
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\AttributeDefaultOperations;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\AttributeResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\AttributeResources;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\ExtraPropertiesResource;
 use ApiPlatform\Tests\Fixtures\TestBundle\State\AttributeResourceProcessor;
 use ApiPlatform\Tests\Fixtures\TestBundle\State\AttributeResourceProvider;
 use PHPUnit\Framework\TestCase;
@@ -187,4 +188,13 @@ class: AttributeDefaultOperations::class,
             ),
         ]), $attributeResourceMetadataCollectionFactory->create(AttributeDefaultOperations::class));
     }
+
+    public function testExtraProperties(): void
+    {
+        $attributeResourceMetadataCollectionFactory = new AttributesResourceMetadataCollectionFactory();
+        $extraPropertiesResource = $attributeResourceMetadataCollectionFactory->create(ExtraPropertiesResource::class);
+
+        $this->assertEquals($extraPropertiesResource[0]->getExtraProperties(), ['foo' => 'bar']);
+        $this->assertEquals($extraPropertiesResource->getOperation('_api_ExtraPropertiesResource_get')->getExtraProperties(), ['foo' => 'bar']);
+    }
 }