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當我檢查Symfony文檔時，我發現只能在選擇類型或集合類型上設置爲true。如何設置從ManytoOne關係中選擇所需（爲true）？
EventsType：
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('nameEvent')
->add('nameOrga')
->add('Job')
->add('description')
->add('typeEvents')
->add('genreEvents')
;
}
Events.php：
class Events
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
*
* @ORM\ManyToOne(targetEntity="TypeEvents", inversedBy="events", cascade={"persist"})
*
*/
private $typeEvents;
/**
*
* @ORM\ManyToOne(targetEntity="GenreEvents", inversedBy="events", cascade={"persist"})
*
*/
private $genreEvents;
/**
*
* @ORM\ManyToOne(targetEntity="BISSAP\UserBundle\Entity\User", inversedBy="events", cascade={"persist"})
*
*/
private $user;
/**
* @var string
*
* @ORM\Column(name="NameEvent", type="string", length=255)
*/
private $nameEvent;
/**
* @var string
*
* @ORM\Column(name="NameOrga", type="string", length=255)
*/
private $nameOrga;
那麼，怎樣才能我設置需要真正的typeEvents和genreEvents？