关于ManyToMany关系的DQL：多个where参数

Question

我有2个具有ManyToMany

关系的实体

class User{
    /**
     * Owning Side
     *
     * @ORM\ManyToMany(targetEntity="Aire\AppBundle\Entity\Project", inversedBy="projectFollowed")
     * @ORM\JoinTable(name="project_followed",
     *      joinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="project_id", referencedColumnName="id")}
     * )
     **/
    private $projectFollowed;
}

class Project{
    /**
     * Inverse Side
     *
     * @ORM\ManyToMany(targetEntity="Application\Sonata\UserBundle\Entity\User", mappedBy="projectFollowed")
     **/
    private $projectFollowed;
}

如果已经有用户分配到此项目，我需要检查我的project_followed表。

$dql = '
        SELECT user
        FROM Application\Sonata\UserBundle\Entity\User user
        INNER JOIN user.projectFollowed project_followed
        WHERE project_followed.project_id = :project_id
        AND project_followed.user_id = :user_id
    ';

    $em = $this->getDoctrine()->getManager();

    $query = $em
        ->createQuery( $dql )
        ->setParameter( 'project_id', $project_id )
        ->setParameter( 'user_id', $user_id )
        ;

看来我的DQL不正确：

  

类AppBundle \ Entity \ Project没有名为project_id的字段或关联

所以，如果我改变

WHERE project_followed.project_id = :project_id

到

WHERE project_followed.id = :project_id

它正在工作，但我如何与用户ID建立关系？

这是因为我需要检查是否没有重复的条目。