从多对多关系的反面节省问题

Question

我有两个实体:AudioPlaylist和AudioTrack.

AudioPlaylist.php:

/**
 * @ORM\ManyToMany(targetEntity = "AudioTrack", inversedBy = "audioPlaylists")
 * @ORM\JoinTable(name = "audioplaylist_audiotrack")
 *
 * @var ArrayCollection
 */
protected $audioTracks;

AudioTrack.php:

/**
 * @ORM\ManyToMany(targetEntity = "AudioPlaylist", mappedBy = "audioTracks")
 * 
 * @var ArrayCollection
 */
 protected $audioPlaylists;

我的问题是,当我打电话时$audioTrack->addAudioPlaylist($audioPlaylist),audioplaylist_audiotrack表格没有更新.我期待在表中添加一个新行,表示两个实体之间的关系.虽然$audioPlaylist->addAudioTrack($audioTrack)添加了一个新行,但一切正常.

我确保坚持$audioTrack并刷新实体管理器,但没有运气,所以我认为我的注释一定有问题(我正在使用Doctrine文档中的这个例子).有任何想法吗？

Answer 1

这可能是因为您没有cascade为反面设置属性.您必须为Doctrine2显式定义级联以保留任何相关实体.

/**
 * @ORM\ManyToMany(targetEntity = "AudioPlaylist",
 *                     mappedBy = "audioTracks",
 *                      cascade = {"persist", "remove"})
 * 
 * @var ArrayCollection
 */
protected $audioPlaylists;

请确保您还您添加AudioTrack到AudioPlaylist为好,打电话时AudioTrack::addAudioPlaylist():

public function addAudioPlaylist(AudioPlaylist $playlist)
{
    $this->getAudioPlaylists()->add($playlist);
    $playlist->getAudioTracks()->add($this);
}