fix: UniqueEntity::$service is considered final

Tests/Validator/Constraints/UniqueTest.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Bundle\MongoDBBundle\Tests\Validator\Constraints;
+
+use Doctrine\Bundle\MongoDBBundle\Validator\Constraints\Unique;
+use Doctrine\Common\Annotations\AnnotationReader;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+use Symfony\Component\Validator\Mapping\Loader\AnnotationLoader;
+
+use function assert;
+
+use const PHP_VERSION_ID;
+
+final class UniqueTest extends TestCase
+{
+    public function testWithDefaultProperty(): void
+    {
+        $metadata = new ClassMetadata(UniqueDocumentDummyOne::class);
+
+        if (PHP_VERSION_ID >= 80000) {
+            $loader = new AnnotationLoader();
+        } else {
+            $loader = new AnnotationLoader(new AnnotationReader());
+        }
+
+        self::assertTrue($loader->loadClassMetadata($metadata));
+
+        [$constraint] = $metadata->getConstraints();
+        assert($constraint instanceof Unique);
+        self::assertSame(['email'], $constraint->fields);
+        self::assertSame('doctrine_odm.mongodb.unique', $constraint->validatedBy());
+    }
+}
+
+/** @Unique(fields={"email"}) */
+#[Unique(['email'])]
+class UniqueDocumentDummyOne
+{
+    private string $email;
+}

Validator/Constraints/Unique.php

@@ -16,6 +16,36 @@
 #[Attribute(Attribute::TARGET_CLASS | Attribute::IS_REPEATABLE)]
 class Unique extends UniqueEntity
 {
-    /** @var string */
-    public $service = 'doctrine_odm.mongodb.unique';
+    /**
+     * @param string[]|string      $fields     The combination of fields that must contain unique values or a set of options
+     * @param bool|string[]|string $ignoreNull The combination of fields that ignore null values
+     * @param mixed                $payload
+     */
+    public function __construct(
+        $fields,
+        ?string $message = null,
+        string $service = 'doctrine_odm.mongodb.unique',
+        ?string $em = null,
+        ?string $entityClass = null,
+        ?string $repositoryMethod = null,
+        ?string $errorPath = null,
+        $ignoreNull = null,
+        ?array $groups = null,
+        $payload = null,
+        array $options = []
+    ) {
+        parent::__construct(
+            $fields,
+            $message,
+            $service,
+            $em,
+            $entityClass,
+            $repositoryMethod,
+            $errorPath,
+            $ignoreNull,
+            $groups,
+            $payload,
+            $options,
+        );
+    }
 }