如何在Symfony 4中禁止返回其他实体引用？

composer require symfony/serializer

use Symfony\Component\Serializer\Annotation\Groups;

class User
{
    /**
     * @Groups({"user"})
     */
    private $id;

    /**
     * @Groups({"user"})
     */
    private $name;

    // 其他属性和方法...
}

use Symfony\Component\Serializer\Annotation\Groups;
use Symfony\Component\Serializer\SerializerInterface;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class UserController extends AbstractController
{
    /**
     * @Route("/user/{id}", methods={"GET"})
     * @Groups({"user"})
     */
    public function getUser(User $user, SerializerInterface $serializer)
    {
        $serializedUser = $serializer->serialize($user, 'json');

        return new Response($serializedUser, 200, ['Content-Type' => 'application/json']);
    }
}

framework:
    serializer: { enabled: true }