Symfony 3.2 检测到循环引用(配置限制:1) [英] Symfony 3.2 A circular reference has been detected (configured limit: 1)

问题描述

我的项目中有这两个实体

I have this two entities in my project

class PoliceGroupe
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="code", type="string", length=50)
     */
    private $code;

    /**
     * @ORM\ManyToMany(targetEntity="PointVente", inversedBy="policegroupe")
     * @ORM\JoinTable(name="police_groupe_point_vente",
     *      joinColumns={@ORM\JoinColumn(name="police_groupe_id", referencedColumnName="id")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="point_vente_id", referencedColumnName="id")}
     *      )
     */
    private $pointVente;
    /**
     * Constructor
     */
    public function __construct($produit)
    {
       $this->pointVente = new \Doctrine\Common\Collections\ArrayCollection();
    }
}

这是我的另一个实体

class PointVente
{
    /**
     * @var string
     *
     * @ORM\Column(name="abb", type="string", length=50)
     */
    private $abb;

    /**
     * @var string
     *
     * @ORM\Column(name="libelle", type="string", length=255)
     */
    private $libelle;

    /**
     *
     * @ORM\ManyToMany(targetEntity="PoliceGroupe", mappedBy="pointVente")
     */
    private $policegroupe;
    }

我正在尝试在我的控制器中运行此代码

and i'm trying to run this code in my controller

$encoders = array(new XmlEncoder(), new JsonEncoder());
$normalizers = array(new ObjectNormalizer());
$serializer = new Serializer($normalizers, $encoders);
$em = $this->getDoctrine()->getManager();
$data = $request->get('data');
$policegroupe=$em->getRepository('StatBundle:PoliceGroupe')->findOneBy(array('id' => $data));
$pointventes = $policegroupe->getPointVente();
$jsonContent = $serializer->serialize($pointventes, 'json');
return new JsonResponse( array('pointventes'=>$jsonContent) );

但我得到这个例外

Symfony\Component\Serializer\Exception\CircularReferenceException: A circular reference has been detected (configured limit: 1).
    at n/a
        in C:\wamp\www\Sys\vendor\symfony\symfony\src\Symfony\Component\Serializer\Normalizer\AbstractNormalizer.php line 194

我根据教义注释映射了我的实体.我错过了什么吗?

I mapped my entities according to the doctrine annotations. Am I missing something?

推荐答案

Symfony 3.2

使用 setCircularReferenceLimit 方法.例如:

$normalizer = new ObjectNormalizer();
$normalizer->setCircularReferenceLimit(2);
// Add Circular reference handler
$normalizer->setCircularReferenceHandler(function ($object) {
    return $object->getId();
});
$normalizers = array($normalizer);
$serializer = new Serializer($normalizers, $encoders);

原因是当您尝试序列化实体时，实体中的循环引用会导致一些问题.该方法的作用是定义序列化层次结构的最大深度.

The reason is that the circular referencing in your entities causes some problems when you try to serialize them. The effect of the method is to define the maximum depth of the serialization hierarchy.

添加循环引用处理程序(检测到循环引用(配置限制:1)Serializer SYMFONY)

Added circular reference handler (A circular reference has been detected (configured limit: 1) Serializer SYMFONY)

尝试使用 Symfony 3.2，但 circular_reference_limit 不是这里的问题(默认为 1 就可以，否则您的实体将被检索 2 次)，问题在于实体由 circular_reference_handler 处理.告诉 id 是实体标识符可以解决问题.请参阅 Symfony 文档在本段底部.

To be tried with Symfony 3.2, but the circular_reference_limit is not the problem here (and the defaults to 1 is OK, else your entity will be retrieved 2 times), the problem is the way the entity is handled by circular_reference_handler. Telling that id is the entity identifier solves the problem. See Symfony Docs at the bottom of this paragraph.

由于 setCircularReferenceHandler 已弃用 支持上下文的以下键 circular_reference_handler，我们可以这样写:

Since setCircularReferenceHandler is deprecated in favour of the following keys of the context circular_reference_handler, we can write:

// Tip : Inject SerializerInterface $serializer in the controller method
// and avoid these 3 lines of instanciation/configuration
$encoders = [new JsonEncoder()]; // If no need for XmlEncoder
$normalizers = [new ObjectNormalizer()];
$serializer = new Serializer($normalizers, $encoders);

// Serialize your object in Json
$jsonObject = $serializer->serialize($objectToSerialize, 'json', [
    'circular_reference_handler' => function ($object) {
        return $object->getId();
    }
]);

// For instance, return a Response with encoded Json
return new Response($jsonObject, 200, ['Content-Type' => 'application/json']);

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