从实体的数组集合中删除一个或多个项时，Symfony 4.4序列化程序出现问题

use Symfony\Component\Serializer\SerializerInterface;

class YourController
{
    private $serializer;

    public function __construct(SerializerInterface $serializer)
    {
        $this->serializer = $serializer;
    }

    public function yourAction()
    {
        // 从数据库中获取实体数组
        $entities = $this->getDoctrine()->getRepository(YourEntity::class)->findAll();

        // 将实体数组转换为数组
        $data = [];
        foreach ($entities as $entity) {
            $data[] = $entity->toArray();
        }

        // 将数组序列化为JSON字符串
        $json = $this->serializer->serialize($data, 'json');

        // 返回JSON响应
        return new JsonResponse($json);
    }
}