Symfony序列化学说实体

Question

我有一个简单的实体类:

<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;


/**
 * @ORM\Entity(repositoryClass="CompanyUserRepository")
 * @ORM\Table(name="company_users")
 */
class CompanyUser
{
/**
 * @ORM\Column(type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 */
private $id;

/**
 * @ORM\Column(type="string", length=100)
 */
private $firstName;

/**
 * @ORM\Column(type="string", length=100)
 */
private $lastName ;

/**
 * @ORM\OneToMany(targetEntity="Score", mappedBy="user")
 */
private $scores;
/**
 * Constructor
 */
public function __construct()
{
    $this->scores = new ArrayCollection();
}

/**
 * Get id
 *
 * @return integer
 */
public function getId()
{
    return $this->id;
}

/**
 * Set firstName
 *
 * @param string $firstName
 *
 * @return CompanyUser
 */
public function setFirstName($firstName)
{
    $this->firstName = $firstName;

    return $this;
}

/**
 * Get firstName
 *
 * @return string
 */
public function getFirstName()
{
    return $this->firstName;
}

/**
 * Set lastName
 *
 * @param string $lastName
 *
 * @return CompanyUser
 */
public function setLastName($lastName)
{
    $this->lastName = $lastName;

    return $this;
}

/**
 * Get lastName
 *
 * @return string
 */
public function getLastName()
{
    return $this->lastName;
}

/**
 * Add score
 *
 * @param \AppBundle\Entity\Score $score
 *
 * @return CompanyUser
 */
public function addScore(\AppBundle\Entity\Score $score)
{
    $this->scores[] = $score;

    return $this;
}

/**
 * Remove score
 *
 * @param \AppBundle\Entity\Score $score
 */
public function removeScore(\AppBundle\Entity\Score $score)
{
    $this->scores->removeElement($score);
}

/**
 * Get scores
 *
 * @return \Doctrine\Common\Collections\Collection
 */
public function getScores()
{
    return $this->scores;
}

}

当我尝试获取所有用户并在json中序列化时出现问题:

/**
 * @Route("/api/getUsers", name="getUsers")
 */
public function getUsers(Request $request){
    $users = $this->getDoctrine()
    ->getRepository('AppBundle:CompanyUser')
    ->findAll();

    $serializer = $this->get('serializer');
    $data = $serializer->serialize($users, 'json');

    return new Response($users);
}

我得到了一个已经检测到的循环引用(配置限制:1). 当我删除getScores getter时,一切正常.我只需要获取id,firstName和lastName.有没有办法不序列化其他对象？

Answer 1

好吧,在序列化具有关系的实体时,处理循环引用是很常见的事情.

解决方案号 1:实现可序列化接口并使关系属性不是序列化/反序列化(大多数情况下,它是一个有效的解决方案)

解决方案号 2:setCircularReferenceLimit()此规范化器的方法设置在将其视为循环引用之前将序列化同一对象的次数.它的默认值是1.因此,在调用serialize()方法之前,执行以下操作:

public function getUsers(Request $request){
    $users = $this->getDoctrine()
    ->getRepository('AppBundle:CompanyUser')
    ->findAll();

    $serializer = $this->get('serializer');
    $serializer->setCircularReferenceLimit(2); // Change this with a proper value for your case
    $data = $serializer->serialize($users, 'json');

    return new Response($data);
}

****更新****

正如@Derek在评论中所说,解决方案没有.在某些版本的Symfony中,2可能无效.然后,您可以尝试以这种方式为循环引用设置处理程序:

$encoder = new JsonEncoder();
$normalizer = new ObjectNormalizer();

$normalizer->setCircularReferenceHandler(function ($object) {
   return $object->getName(); // Change this to a valid method of your object
});

$serializer = new Serializer(array($normalizer), array($encoder));
var_dump($serializer->serialize($org, 'json'));    

这应该返回您的实体值,而不是迭代关系.