fix(state): on creation, give expected class to object mapper

src/State/Processor/ObjectMapperProcessor.php

@@ -15,6 +15,7 @@
 
 use ApiPlatform\Metadata\Operation;
 use ApiPlatform\State\ProcessorInterface;
+use ApiPlatform\State\Util\StateOptionsTrait;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\ObjectMapper\ObjectMapperInterface;
 
@@ -23,6 +24,8 @@
  */
 final class ObjectMapperProcessor implements ProcessorInterface
 {
+    use StateOptionsTrait;
+
     /**
      * @param ProcessorInterface<mixed,mixed> $decorated
      */
@@ -48,9 +51,17 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
         }
 
         $request = $context['request'] ?? null;
+
+        // maps the Resource to an Entity
+        if ($request?->attributes->get('mapped_data')) {
+            $mappedData = $this->objectMapper->map($data, $request->attributes->get('mapped_data'));
+        } else {
+            $mappedData = $this->objectMapper->map($data, $this->getStateOptionsClass($operation, $operation->getClass()));
+        }
+        $request?->attributes->set('mapped_data', $mappedData);
+
         $persisted = $this->decorated->process(
-            // maps the Resource to an Entity
-            $this->objectMapper->map($data, $request?->attributes->get('mapped_data')),
+            $mappedData,
             $operation,
             $uriVariables,
             $context,

src/Symfony/Tests/Fixtures/AnotherMappedObject.php

@@ -0,0 +1,18 @@
+<?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\Symfony\Tests\Fixtures;
+
+class AnotherMappedObject
+{
+}

tests/Fixtures/TestBundle/ApiResource/FirstResource.php

@@ -16,6 +16,7 @@
 use ApiPlatform\Doctrine\Orm\State\Options;
 use ApiPlatform\Metadata\ApiResource;
 use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\Symfony\Tests\Fixtures\AnotherMappedObject;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\SameEntity;
 use Symfony\Component\ObjectMapper\Attribute\Map;
 
@@ -24,6 +25,7 @@
     operations: [new GetCollection()],
     stateOptions: new Options(entityClass: SameEntity::class)
 )]
+#[Map(target: AnotherMappedObject::class)]
 #[Map(target: SameEntity::class)]
 final class FirstResource
 {

tests/Fixtures/TestBundle/ApiResource/MappedResource.php

@@ -16,13 +16,15 @@
 use ApiPlatform\Doctrine\Orm\State\Options;
 use ApiPlatform\JsonLd\ContextBuilder;
 use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Symfony\Tests\Fixtures\AnotherMappedObject;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\MappedEntity;
 use Symfony\Component\ObjectMapper\Attribute\Map;
 
 #[ApiResource(
     stateOptions: new Options(entityClass: MappedEntity::class),
     normalizationContext: [ContextBuilder::HYDRA_CONTEXT_HAS_PREFIX => false],
 )]
+#[Map(target: AnotherMappedObject::class)]
 #[Map(target: MappedEntity::class)]
 final class MappedResource
 {

tests/Fixtures/TestBundle/ApiResource/MappedResourceOdm.php

@@ -16,13 +16,15 @@
 use ApiPlatform\Doctrine\Odm\State\Options;
 use ApiPlatform\JsonLd\ContextBuilder;
 use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Symfony\Tests\Fixtures\AnotherMappedObject;
 use ApiPlatform\Tests\Fixtures\TestBundle\Document\MappedDocument;
 use Symfony\Component\ObjectMapper\Attribute\Map;
 
 #[ApiResource(
     stateOptions: new Options(documentClass: MappedDocument::class),
     normalizationContext: [ContextBuilder::HYDRA_CONTEXT_HAS_PREFIX => false],
 )]
+#[Map(target: AnotherMappedObject::class)]
 #[Map(target: MappedDocument::class)]
 final class MappedResourceOdm
 {

tests/Functional/MappingTest.php

@@ -103,6 +103,39 @@ public function testShouldMapBetweenResourceAndEntity(): void
         $this->assertResponseStatusCodeSame(204);
     }
 
+    /**
+     * When an API resource has multiple #[Map] targets (e.g. MappedEntity + AnotherMappedObject),
+     * the ObjectMapperProcessor must resolve the correct target using stateOptions during POST.
+     */
+    public function testPostWithMultipleMapTargetsResolvesCorrectEntity(): void
+    {
+        if ($this->isMongoDB()) {
+            $this->markTestSkipped('MongoDB not tested.');
+        }
+
+        if (!$this->getContainer()->has('api_platform.object_mapper')) {
+            $this->markTestSkipped('ObjectMapper not installed');
+        }
+
+        $this->recreateSchema([MappedEntity::class]);
+        $client = self::createClient();
+        $r = $client->request('POST', 'mapped_resources', ['json' => ['username' => 'multi target']]);
+
+        $this->assertResponseStatusCodeSame(201);
+        $this->assertJsonContains(['username' => 'multi target']);
+
+        // Verify the mapped_data is the entity from stateOptions, not AnotherMappedObject
+        $mappedData = $client->getKernelBrowser()->getRequest()->attributes->get('mapped_data');
+        $this->assertInstanceOf(MappedEntity::class, $mappedData, 'ObjectMapper should resolve to the stateOptions entity class, not the first #[Map] target.');
+
+        // Verify persistence
+        $repo = $this->getManager()->getRepository(MappedEntity::class);
+        $persisted = $repo->findOneBy(['id' => $r->toArray()['id']]);
+        $this->assertNotNull($persisted);
+        $this->assertSame('multi', $persisted->getFirstName());
+        $this->assertSame('target', $persisted->getLastName());
+    }
+
     public function testShouldMapToTheCorrectResource(): void
     {
         if ($this->isMongoDB()) {