[LiveComponent] Add support for interfaces while (de)hydrating a Doctrine entity

src/LiveComponent/src/Hydration/DoctrineEntityHydrationExtension.php

@@ -13,6 +13,7 @@
 
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\Persistence\ManagerRegistry;
+use Doctrine\Persistence\Mapping\MappingException;
 use Doctrine\Persistence\ObjectManager;
 
 /**
@@ -61,8 +62,7 @@ public function dehydrate(object $object): mixed
         $id = $this
             ->objectManagerFor($class = $object::class)
             ->getClassMetadata($class)
-            ->getIdentifierValues($object)
-        ;
+            ->getIdentifierValues($object);
 
         // Dehydrate ID values in case they are other entities
         $id = array_map(fn ($id) => \is_object($id) && $this->supports($id::class) ? $this->dehydrate($id) : $id, $id);
@@ -81,14 +81,44 @@ public function dehydrate(object $object): mixed
 
     private function objectManagerFor(string $class): ?ObjectManager
     {
-        if (!class_exists($class)) {
+        if (class_exists($class)) {
+            // Keep the standard way for a class
+            // todo cache/warmup an array of classes that are "doctrine objects"
+            foreach ($this->managerRegistries as $registry) {
+                if ($om = $registry->getManagerForClass($class)) {
+                    return self::ensureManagedObject($om, $class);
+                }
+            }
+
             return null;
         }
 
-        // todo cache/warmup an array of classes that are "doctrine objects"
-        foreach ($this->managerRegistries as $registry) {
-            if ($om = $registry->getManagerForClass($class)) {
-                return self::ensureManagedObject($om, $class);
+        if (interface_exists($class)) {
+            // special handler for interfaces
+            // For use cases : @see https://symfony.com/doc/current/doctrine/resolve_target_entity.html
+            // As today, getManagerForClass don't resolve nicely aliased interfaces
+            // The workaround is to enum over each object manager and trying to get metadata
+            // The metadata are indeed, resolved nicely
+            // Fore more details :
+            // @see \Doctrine\ORM\Tools\ResolveTargetEntityListener
+
+            // todo cache/warmup an array of interfaces that are resolved "doctrine objects"
+            foreach ($this->managerRegistries as $registry) {
+                foreach ($registry->getManagers() as $om) {
+                    // the getClassMetaData can indeed throw an exception
+                    // so, we
+                    try {
+                        if (null !== $om->getClassMetadata($class)) {
+                            return self::ensureManagedObject($om, $class);
+                        }
+                    } catch (MappingException $e) {
+                        // I did not find a nice way to check if it is because the class is really unknown
+                        // It is good to check for a specific exception ?
+                        // eg: \Doctrine\Persistence\Mapping\MappingException
+                        // @see \Doctrine\Persistence\Mapping\AbstractClassMetadataFactory::getMetadataFor
+                        // throw $e;
+                    }
+                }
             }
         }
 

src/LiveComponent/tests/Fixtures/Dto/Aliased.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace Symfony\UX\LiveComponent\Tests\Fixtures\Dto;
+
+class Aliased
+{
+//    public string $address;
+    public string $name;
+}

src/LiveComponent/tests/Fixtures/Entity/AliasedEntity.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\UX\LiveComponent\Tests\Fixtures\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\ORM\Mapping\Column;
+
+#[ORM\Entity]
+class AliasedEntity implements AliasedEntityInterface
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    public $id;
+
+    #[Column(type: 'string')]
+    public ?string $name = null;
+}

src/LiveComponent/tests/Fixtures/Entity/AliasedEntityInterface.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\UX\LiveComponent\Tests\Fixtures\Entity;
+
+interface AliasedEntityInterface {
+
+}

src/LiveComponent/tests/Fixtures/Kernel.php

@@ -29,6 +29,8 @@
 use Symfony\Component\Security\Core\User\InMemoryUser;
 use Symfony\UX\LiveComponent\LiveComponentBundle;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Component\Component1;
+use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\AliasedEntity;
+use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\AliasedEntityInterface;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Serializer\Entity2Normalizer;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Serializer\MoneyNormalizer;
 use Symfony\UX\StimulusBundle\StimulusBundle;
@@ -170,6 +172,8 @@ protected function configureContainer(ContainerConfigurator $c): void
                         'alias' => 'XML',
                     ],
                 ],
+                'resolve_target_entities' => [
+                    AliasedEntityInterface::class => AliasedEntity::class],
             ],
         ];
 

src/LiveComponent/tests/Integration/Hydration/DoctrineEntityHydrationExtensionTest.php

@@ -11,8 +11,11 @@
 
 namespace Symfony\UX\LiveComponent\Tests\Integration\Hydration;
 
+use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
 use Symfony\UX\LiveComponent\Hydration\DoctrineEntityHydrationExtension;
+use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\AliasedEntity;
+use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\AliasedEntityInterface;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\CompositeIdEntity;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Entity\ForeignKeyIdEntity;
 use Symfony\UX\LiveComponent\Tests\Fixtures\Factory\CompositeIdEntityFactory;
@@ -50,4 +53,34 @@ public function testForeignKeyId(): void
         self::assertSame($foreignKeyIdEntity->id->id, $dehydrated);
         self::assertSame($foreignKeyIdEntity, $extension->hydrate($dehydrated, ForeignKeyIdEntity::class));
     }
+
+    public function testSupportInterface(): void
+    {
+        /** @var DoctrineEntityHydrationExtension $extension */
+        $extension = self::getContainer()->get('ux.live_component.doctrine_entity_hydration_extension');
+
+        self::assertTrue($extension->supports(AliasedEntityInterface::class), 'AliasedEntityInterface should be supported');
+        self::assertTrue($extension->supports(AliasedEntity::class), 'AliasedEntity should be supported');
+        self::assertFalse($extension->supports('UnknownClass'), 'UnknownClass should not be supported');
+    }
+
+    public function testHydrationFromInterface(): void
+    {
+        /** @var DoctrineEntityHydrationExtension $extension */
+        $extension = self::getContainer()->get('ux.live_component.doctrine_entity_hydration_extension');
+        $em = self::getContainer()->get(EntityManagerInterface::class);
+
+        $existingEntity = new AliasedEntity();
+        $existingEntity->name = 'foo';
+
+        $em->persist($existingEntity);
+        $em->flush();
+
+        $dehydratedData = $extension->dehydrate($existingEntity);
+
+        $entityFromDehydratation = $extension->hydrate($dehydratedData, AliasedEntityInterface::class);
+
+        self::assertSame($existingEntity, $entityFromDehydratation, 'instance should be the same');
+        self::assertNull($extension->hydrate(null, AliasedEntityInterface::class), 'should return null if null is passed');
+    }
 }