Class Table 中的级联删除继承不删除父行

Cascading Delete in Class Table Inheritance doesn't delete parent row

我有一个名为 Notification 的父项 class,它的子项之一是 CommentNotification(Class table 继承)。

/**
 * This entity represents the notifications that are sent to users when an event happens
 * @ORM\Entity(repositoryClass="AppBundle\Repository\NotificationRepository")
 * @ORM\InheritanceType("JOINED")
 * @ORM\DiscriminatorColumn(name="type", type="string")
 * @ORM\DiscriminatorMap({
 *     "yp" = "YpNotification",
 *     "default" = "Notification",
 *     "comment" = "CommentNotification",
 *     "post" = "PostNotification"})
 * @ORM\Table(name="notification")
 */
class Notification
{
    /**
     * The identifier of this notification
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     * @var int $id
     */
    protected $id;
}

CommentNotification 中,我包含了 onDelete = "CASCADE",这样当评论被删除时,附在评论上的通知也会被删除。

/**
     * @ORM\Entity
     * @ORM\Table(name="comment_notification")
     * @ORM\Entity(repositoryClass="AppBundle\Entity\Notifications\CommentNotificationRepository")
     */  
class CommentNotification extends Notification
        {

            /**
             *
             * @ORM\ManyToOne(targetEntity="AppBundle\Entity\ContentItem\ContentItemComment")
             * @ORM\JoinColumn(name="comment_id", referencedColumnName="id", onDelete="CASCADE", nullable=false)
             */
            private $comment;
    ...
}

根据要求,我也显示了 ContentItemComment。这不包含与 CommentNotification 的双向关系。

/**
     * 
     * @ORM\Table(name="content_item_comment")
     * @ORM\Entity(repositoryClass="AppBundle\Entity\ContentItem\ContentItemCommentRepository")
     */
    class ContentItemComment
    {
        /**
         * @ORM\Column(type="integer")
         * @ORM\Id
         * @ORM\GeneratedValue(strategy="AUTO")
         */
        protected $id;
...
}

但是它成功删除了 comment_notification 中的行,但是 notification 中的行仍然存在,在通知 table 中给我留下了幻影记录,我必须手动删除每个时间。

F.e 这个查询每天都会 return 一些新的结果:

SELECT * FROM `notification` n WHERE n.id not in (select id from comment_notification) and n.type='comment' 

我是否遗漏了 Notification 中的注释?

Doctrine site 上有以下注释:

When you do not use the SchemaTool to generate the required SQL you should know that deleting a class table inheritance makes use of the foreign key property ON DELETE CASCADE in all database implementations. A failure to implement this yourself will lead to dead rows in the database.

可能是这个原因吗?

所以正如评论中提到的那样 - 如果它是双向关系 - 您需要将 orphanRemoval=true 选项添加到相关的 OneToMany 属性.