Allow to directly use IRIs for attachmennts without the need to rely on _type

src/Serializer/APIPlatform/SkippableItemNormalizer.php

@@ -23,9 +23,13 @@ declare(strict_types=1);
 
 namespace App\Serializer\APIPlatform;
 
+use ApiPlatform\Metadata\Exception\InvalidArgumentException;
+use ApiPlatform\Metadata\Exception\ItemNotFoundException;
+use ApiPlatform\Metadata\IriConverterInterface;
 use ApiPlatform\Serializer\ItemNormalizer;
 use Symfony\Component\DependencyInjection\Attribute\AsDecorator;
-use Symfony\Component\Serializer\Normalizer\CacheableSupportsMethodInterface;
+use Symfony\Component\Serializer\Exception\NotNormalizableValueException;
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\SerializerAwareInterface;
@@ -35,6 +39,10 @@ use Symfony\Component\Serializer\SerializerInterface;
  * This class decorates API Platform's ItemNormalizer to allow skipping the normalization process by setting the
  * DISABLE_ITEM_NORMALIZER context key to true. This is useful for all kind of serialization operations, where the API
  * Platform subsystem should not be used.
+ *
+ * It also works around a bug in API Platform's AbstractItemNormalizer where IRI strings for abstract resource classes
+ * with a discriminator map fail deserialization when objectToPopulate is null (the discriminator is checked before
+ * the IRI string check). See: https://github.com/Part-DB/Part-DB-server/issues/1370
  */
 #[AsDecorator("api_platform.serializer.normalizer.item")]
 class SkippableItemNormalizer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface
@@ -42,13 +50,38 @@ class SkippableItemNormalizer implements NormalizerInterface, DenormalizerInterf
 
     public const DISABLE_ITEM_NORMALIZER = 'DISABLE_ITEM_NORMALIZER';
 
-    public function __construct(private readonly ItemNormalizer $inner)
+    public function __construct(
-    {
+        private readonly ItemNormalizer $inner,
-
+        private readonly IriConverterInterface $iriConverter,
+    ) {
     }
 
     public function denormalize(mixed $data, string $type, ?string $format = null, array $context = []): mixed
     {
+        // API Platform's AbstractItemNormalizer has a bug: when objectToPopulate is null and data is an IRI
+        // string, it tries to resolve the discriminator class from [$iri_string] before reaching the IRI
+        // check (line 271). For abstract resource classes with a discriminator map (e.g. Attachment), this
+        // fails because the array has no _type key. Fix by resolving IRI strings directly.
+        // See: https://github.com/Part-DB/Part-DB-server/issues/1370
+        if (is_string($data)) {
+            try {
+                return $this->iriConverter->getResourceFromIri($data, $context + ['fetch_data' => true]);
+            } catch (ItemNotFoundException $e) {
+                if (false === ($context['denormalize_throw_on_relation_not_found'] ?? true)) {
+                    return null;
+                }
+                if (!isset($context['not_normalizable_value_exceptions'])) {
+                    throw new UnexpectedValueException($e->getMessage(), $e->getCode(), $e);
+                }
+                throw NotNormalizableValueException::createForUnexpectedDataType($e->getMessage(), $data, [$type], $context['deserialization_path'] ?? null, true, $e->getCode(), $e);
+            } catch (InvalidArgumentException $e) {
+                if (!isset($context['not_normalizable_value_exceptions'])) {
+                    throw new UnexpectedValueException(sprintf('Invalid IRI "%s".', $data), $e->getCode(), $e);
+                }
+                throw NotNormalizableValueException::createForUnexpectedDataType(sprintf('Invalid IRI "%s".', $data), $data, [$type], $context['deserialization_path'] ?? null, true, $e->getCode(), $e);
+            }
+        }
+
         return $this->inner->denormalize($data, $type, $format, $context);
     }
 
@@ -87,4 +120,4 @@ class SkippableItemNormalizer implements NormalizerInterface, DenormalizerInterf
             'object' => false
         ];
     }
-}
+}

tests/API/Endpoints/PartEndpointTest.php

@@ -69,4 +69,28 @@ final class PartEndpointTest extends CrudEndpointTestCase
     {
         $this->_testDeleteItem(1);
     }
-}
+
+    public function testAttachmentPatchWithIRI(): void
+    {
+        $client = static::createAuthenticatedClient();
+
+        // Create a new attachment with a picture URL for Part 1
+        $response = $client->request('POST', '/api/attachments', ['json' => [
+            'name' => 'Test Picture',
+            'url' => 'http://example.com/test.jpg',
+            '_type' => 'Part',
+            'element' => '/api/parts/1',
+            'attachment_type' => '/api/attachment_types/1',
+        ]]);
+        self::assertResponseIsSuccessful();
+        $attachmentIri = $response->toArray()['@id'];
+
+        // Now PATCH Part 1 to set master_picture_attachment
+        $client->request('PATCH', '/api/parts/1', [
+            'json' => ['master_picture_attachment' => $attachmentIri],
+            'headers' => ['Content-Type' => 'application/merge-patch+json'],
+        ]);
+        self::assertResponseIsSuccessful();
+        self::assertJsonContains(['master_picture_attachment' => ['@id' => $attachmentIri]]);
+    }
+}