fix(serializer): properly normalize DateTimeInterface objects

Author: bpolaszek

config/services.xml

@@ -66,5 +66,9 @@
             <argument type="service" id="meilisearch.client" />
             <tag name="console.command" />
         </service>
+
+        <service id="Meilisearch\Bundle\Services\UnixTimestampNormalizer">
+            <tag name="serializer.normalizer" />
+        </service>
     </services>
 </container>

src/SearchableEntity.php

@@ -61,6 +61,7 @@ public function getIndexUid(): string
     public function getSearchableArray(): array
     {
         $context = [
+            'meilisearch' => true,
             'fieldsMapping' => $this->entityMetadata->fieldMappings,
         ];
 

src/Services/UnixTimestampNormalizer.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Meilisearch\Bundle\Services;
+
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+final class UnixTimestampNormalizer implements NormalizerInterface
+{
+    /**
+     * @param \DateTimeInterface $object
+     */
+    public function normalize(mixed $object, string $format = null, array $context = []): int
+    {
+        return (int) $object->format('U');
+    }
+
+    public function supportsNormalization(mixed $data, string $format = null, array $context = []): bool
+    {
+        return $data instanceof \DateTimeInterface && true === ($context['meilisearch'] ?? null);
+    }
+}

tests/Unit/SerializationTest.php

@@ -18,10 +18,6 @@ class SerializationTest extends KernelTestCase
     public function testSimpleEntityToSearchableArray(): void
     {
         $datetime = new \DateTime();
-        $dateNormalizer = static::getContainer()->get('serializer.normalizer.datetime');
-        // This way we can test that DateTime's are serialized with DateTimeNormalizer
-        // And not the default ObjectNormalizer
-        $serializedDateTime = $dateNormalizer->normalize($datetime, Searchable::NORMALIZATION_FORMAT);
 
         $post = new Post(
             [
@@ -51,12 +47,12 @@ public function testSimpleEntityToSearchableArray(): void
             'id' => 12,
             'title' => 'a simple post',
             'content' => 'some text',
-            'publishedAt' => $serializedDateTime,
+            'publishedAt' => (int) $datetime->format('U'),
             'comments' => [
                 [
                     'id' => null,
                     'content' => 'a great comment',
-                    'publishedAt' => $serializedDateTime,
+                    'publishedAt' => (int) $datetime->format('U'),
                 ],
             ],
         ];