当表单具有实体类型时，Symfony3 多对多关系

Question

所以我正在为我的网站构建消息系统，我有 Message 实体，它与 Inbox[= 具有多对多关系30=]，它应该存储 message_id 和 receiver_id。这是因为用户应该能够向 许多 用户

发送消息

我已经完成了所有关系，但是，当提交表单时我得到错误：

Expected value of type "Doctrine\Common\Collections\Collection|array" for association field "DEERCMS\MessageBundle\Entity\Message#$receiver", got "PTB\UserBundle\Entity\User" instead.

这是表格，它有 'multiple' => true 因为正如我所说，用户应该能够向许多其他用户发送消息

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
            ->add('receiver', EntityType::class, array(
                'class' => 'PTBUserBundle:User',
                'choice_label' => 'email',
                 'multiple' => true,
                 'expanded' => false,    
            ))
            ->add('title')
            ->add('message', TextareaType::class);
}

还有我的实体 留言

/**
* Message
*
* @ORM\Table()
* @ORM\Entity()
*/

class Message
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\Column(type="string")
     */
    private $sender;

    /**
     * @ORM\ManyToMany(targetEntity="DEERCMS\MessageBundle\Entity\Inbox")
     * @ORM\JoinTable(name="message_receivers",
     *      joinColumns={@ORM\JoinColumn(name="message_id", referencedColumnName="id")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="receiver_id", referencedColumnName="id", unique=true)}
     *      )
     */
    private $receiver;
    /**
     * @ORM\Column type="string")
     */
    private $title;

    /**
     * @ORM\Column(type="string", length=4000)
     */
    private $message;

    /**
     * @ORM\Column(type="date")
     */
    private $date;

    /**
     * @ORM\Column(type="boolean")
     */
    private $displayed;


    public function __construct() 
    {
        $this->date = new \DateTime();
        $this->receiver = new \Doctrine\Common\Collectionsn\ArrayCollection();
    }

    //...     

    /**
     * Set sender
     *
     * @param integer $sender
     *
     * @return Message
     */
    public function setSender($sender)
    {
        $this->sender = $sender;

        return $this;
    }

    /**
     * Get sender
     *
     * @return int
     */
    public function getSender()
    {
        return $this->sender;
    }

    /**
     * Set receiver
     *
     * @param integer $receiver
     *
     * @return Message
     */
    public function setReceiver($receiver)
    {
        $this->receiver = $receiver;

        return $this;
    }

    /**
     * Get receiver
     *
     * @return int
     */
    public function getReceiver()
    {
        return $this->receiver;
    }



    /**
     * Add receiver
     *
     * @param \DEERCMS\MessageBundle\Entity\Inbox $receiver
     *
     * @return Message
     */
    public function addReceiver(\DEERCMS\MessageBundle\Entity\Inbox $receiver)
    {
        $this->receiver[] = $receiver;

        return $this;
    }

    /**
     * Remove receiver
     *
     * @param \DEERCMS\MessageBundle\Entity\Inbox $receiver
     */
    public function removeReceiver(\DEERCMS\MessageBundle\Entity\Inbox $receiver)
    {
        $this->receiver->removeElement($receiver);
    }
}

收件箱

/**
 * Inbox
 *
 * @ORM\Table(name="inbox")
 * @ORM\Entity(repositoryClass="DEERCMS\MessageBundle\Repository\InboxRepository")
 */
class Inbox
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;


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

Answer 1

我自己解决了。所以基本上目标实体是错误的，应该在消息和用户之间定义关系，这是它的样子

 /**
 * @ORM\ManyToMany(targetEntity="PTB\UserBundle\Entity\User")
 * @ORM\JoinTable(name="message_receivers",
 *      joinColumns={@ORM\JoinColumn(name="message_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id", unique=true)}
 *      )
 */
private $user;