如何在其他实体中使用FOS用户ID

我尝试将userid值保存到我的新实体RDV中,当我尝试这样做时:

$user = $this->getUser()->getId();
$rdv->setUserid($user);

这是我的RDV实体:

    /**
     * @ORM\ManyToOne(targetEntity="UserBundle\Entity\User", cascade=
       {"persist"})
     */
private $userid;

我收到以下错误:

Catchable Fatal Error: Argument 1 passed to CMRBundle\Entity\RDV::setUserid() must be an instance of UserBundle\Entity\User, integer given, called in C:\wamp64\www\No\src\CMRBundle\Controller\AdvertController.php

谢谢你帮我