symfony/学说：关于双向多对多关系。我能'；无法获取相关对象

我有一个多对多关系和一个动作：

<?php

namespace Acme\HelloBundle\Entity;

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

/**
 * @ORM\Entity
 * @ORM\Table(name="article")
 */
class Article
{

  /**
   * @ORM\Id
   * @ORM\Column(type="integer")
   * @ORM\GeneratedValue(strategy="AUTO")
   */
  protected $id;

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

  /**
   * @ORM\ManyToMany(targetEntity="User", inversedBy="articles")
  */  
  protected $users;  

    public function __construct()
    {
        $this->users = new \Doctrine\Common\Collections\ArrayCollection();
    }

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

    /**
     * Set name
     *
     * @param string $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

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


    /**
     * Add users
     *
     * @param Acme\HelloBundle\Entity\User $users
     */
    public function addUser(\Acme\HelloBundle\Entity\User $users)
    {        
        //$users->addArticle($this); // synchronously updating inverse side
        $this->users[] = $users;
    }

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

<?php

namespace Acme\HelloBundle\Entity;

//  use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @ORM\Entity
 * @ORM\Table(name="user")
 */
class User
{

  /**
   * @ORM\Id
   * @ORM\Column(type="integer")
   * @ORM\GeneratedValue(strategy="AUTO")
   */
  protected $id;

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

  /**
  * @ORM\ManyToMany(targetEntity="Article", mappedBy="users")
  */
  protected $articles;


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

    /**
     * Set name
     *
     * @param string $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }
    public function __construct()
    {
        $this->articles = new \Doctrine\Common\Collections\ArrayCollection();
    }

    /**
     * Add articles
     *
     * @param Acme\HelloBundle\Entity\article $articles
     */
    public function addArticle(\Acme\HelloBundle\Entity\article $articles)
    {
        $this->articles[] = $articles;
    }

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


/////////////////////////////////

    public function indexAction($name)
    {

        $article = $this->getDoctrine()->getRepository('AcmeHelloBundle:Article')->findOneBy(array());


        $users = $article->getUsers();

        var_dump($users);

    }

---

我希望一个用户对象作为输出。

您将返回一个用户集合，因为它是一个ToMany关联

只需在集合上迭代：

<?php
// ...
$users = $article->getUsers();
foreach($users as $u){
    var_dump($u);
}

---

您还可以使用以下方法从对象获取值数组：

$users = $article->getUsers()->getValues();

$users = $article->getUsers()->getValues();