[Serializer] Add #[ExtendsSerializationFor] to declare new serialization attributes for a class

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -188,6 +188,7 @@
 use Symfony\Component\Semaphore\SemaphoreFactory;
 use Symfony\Component\Semaphore\Store\StoreFactory as SemaphoreStoreFactory;
 use Symfony\Component\Serializer\Attribute as SerializerMapping;
+use Symfony\Component\Serializer\Attribute\ExtendsSerializationFor;
 use Symfony\Component\Serializer\DependencyInjection\AttributeMetadataPass as SerializerAttributeMetadataPass;
 use Symfony\Component\Serializer\Encoder\DecoderInterface;
 use Symfony\Component\Serializer\Encoder\EncoderInterface;
@@ -2164,6 +2165,11 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
         $container->getDefinition('serializer.normalizer.property')->setArgument(5, $defaultContext);
 
         $container->setParameter('.serializer.named_serializers', $config['named_serializers'] ?? []);
+
+        $container->registerAttributeForAutoconfiguration(ExtendsSerializationFor::class, function (ChildDefinition $definition, ExtendsSerializationFor $attribute) {
+            $definition->addTag('serializer.attribute_metadata', ['for' => $attribute->class])
+                ->addTag('container.excluded', ['source' => 'because it\'s a serializer metadata extension']);
+        });
     }
 
     private function registerJsonStreamerConfiguration(array $config, ContainerBuilder $container, PhpFileLoader $loader): void