Php Symfony如何序列化实体FOSRestController

我对api和ExclutionPolicy使用FOSRestController，对entity使用Expose，对于某些逻辑，我有两个操作，但当我返回entity$位时，我希望看到不同的字段，例如一个操作只是id和created，而第二个操作只是字段projectId。因为现在我返回带有注释@Expose的字段，但这是所有操作的结果。我有一个问题，如何为另一个操作配置类BitController extends FOSRestController的实体字段？我在控制器中使用@Groups（{“list”}）和

$bits = $this->get('serializer')->serialize(new Bit(), 'json', SerializationContext::create()->setGroups(array('list')));

但是有$bits={}也许这是因为$bits数组

/**
 * Bit
 *
 * @ORM\Table(name="bit")
 * @ORM\Entity(repositoryClass="Artel\ProfileBundle\Entity\Repository\BitRepository")
 * @ExclusionPolicy("all")
 */
class Bit
{
/**
 * @var integer
 *
 * @ORM\Column(name="id", type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 * @Expose()
 * @Groups({"list"})
 */
private $id;

/**
 * @var datetime $created
 *
 * @Gedmo\Timestampable(on="create")
 * @ORM\Column(type="datetime")
 * @Expose()
 */
private $created;

/**
 * @ORM\ManyToOne(targetEntity="Project", inversedBy="bit")
 * @ORM\JoinColumn(name="project_id", referencedColumnName="id", onDelete="CASCADE")
 *
 * @Groups({"list"})
 */
private $projectId;

class BitController extends FOSRestController
{
    public function getBitByProjectAction($id, $token)
    {
    $security = $this->get('security.context');
    $user = $this->getDoctrine()->getRepository('ArtelProfileBundle:Users')->findOneBySecuritytoken($token);

    if (!empty($user) || $security->isGranted('ROLE_ADMIN') ) {
        $bits = $this->getDoctrine()->getManager()
            ->getRepository('ArtelProfileBundle:Bit')
            ->findBitByProject($id, $token);
        if (!$bits) {
            throw new NotFoundHttpException();
        }
                    $view = $this->view($bits, 200)
            ->setSerializationContext(SerializationContext::create()->setGroups(array('list')))
        ;

        return $this->handleView($view);


   public function getBitsProjectsAction($token)
   {
    $user = $this->getDoctrine()->getRepository('ArtelProfileBundle:Users')->findOneBySecuritytoken($token);
    $view = View::create();
    if (!empty($user) && !empty($token)) {
        $bits = $this->getDoctrine()->getRepository('ArtelProfileBundle:Bit')->findClientsBitsByProjects($token);
        $view->setStatusCode(200);
                   $view = $this->view($bits, 200)
            ->setSerializationContext(SerializationContext::create()->setGroups(array('list')))
        ;

        return $this->handleView($view);
    }else{
        $view->setStatusCode(101);
    }
    return $view;
}

已解决

            $view = $this->view($bits, 200)
            ->setSerializationContext(SerializationContext::create()->setGroups(array('list')))
        ;

        return $this->handleView($view);

---

您是否检查过是否创建了对象的不同视图？我不知道，我需要创建VersionedObject，以及VersionedObject如何知道实体位bot-undership或我需要使用注释@Groups？返回$bits这是arrayI更新我的问题