Question

我尝试使用学说cascade={"remove"}，但它不起作用。

情况：我宣布包含许多图片（一张图片只能参考一张图片）。我希望当我删除数据库中的通知时，它也会删除图片。

这是我的代码：

实体宣布：

/**
 * Announce
 *
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="AppBundle\Entity\Announce\AnnounceRepository")
 */
class Announce
{
    /**
     * @ORM\OneToOne(targetEntity="AppBundle\Entity\Announce\PictureAnnounce", inversedBy="coverAnnounce")
     * @ORM\JoinColumn(name="cover_picture_id", referencedColumnName="id", nullable=true)
     */
    private $coverPicture; 

    /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Announce\PictureAnnounce", mappedBy="announce", cascade={"remove"})
     */
    private $pictureAnnounces; 
}

实体图片宣布：

/**
 * AppBundle\Entity\Announce\PictureAnnounce
 *
 * @ORM\Table(name="picture_announce")
 * @ORM\Entity(repositoryClass="AppBundle\Entity\Announce\PictureAnnounceRepository")
 * @ORM\HasLifecycleCallbacks
 */
class PictureAnnounce
{
    /**
     * @ORM\OneToOne(targetEntity="AppBundle\Entity\Announce\Announce", mappedBy="coverPicture", cascade={"persist"})
     */
    private $coverAnnounce;

    /**
     * @var Announce $announce
     *
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Announce\Announce", inversedBy="pictureAnnounces")
     * @ORM\JoinColumn(name="announce_id", referencedColumnName="id", nullable=false)
    */
    private $announce;

删除代码（我将coverPicture设置为null，以便删除时不会出现外键错误）

$announce->setCoverPicture(null);
$em->flush();
$em->remove($announce);
$em->flush();

但我在外键上有错误

SQLSTATE [23000]：完整性约束违规：1451无法删除或更新父行：外键约束失败

PS：我无法找到如何正确呈现我的代码：s

PS：这种解决方法有效，但不是级联工作的方式吗？

if(count($announce->getPictureAnnounces()) > 0) { 
   $pictureAnnounces = $announce->getPictureAnnounces();
   foreach ($pictureAnnounces as $pictureAnnounce) { 
     $em->remove($pictureAnnounce);
   }
   $em->flush(); 
} // Then remove the announce

Symfony 2.7，Doctrine级联删除

0 个答案: