从oneToMany关系中删除项目

Question

我有以下图库实体

class Gallery
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var ArrayCollection
     * @ORM\OneToMany(targetEntity="Tessa\GalleryBundle\Entity\Photo", mappedBy="gallery", cascade={"persist", "remove"})
     */
    private $photos;

    /* ... */
}

这gallery与实体的manyToOne关系有关PointOfInterest.这是宣言

class PointOfInterest
{
 /* ... */
 /**
 * @ORM\ManyToOne(targetEntity="Tessa\GalleryBundle\Entity\Gallery", cascade={"persist", "remove"})
 * @ORM\JoinColumn(nullable=false)
 */
private $gallery;
 /* ... */

我还使用表单来更新PointOfInterest实体.这是表格声明

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
            ->add('name',           'text')
            ->add('gallery',        new GalleryType())
       ;
}

和GalleryType声明.

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('photos', 'collection', array('type'          => new PhotoType(),
                                            'required'      => false,
                                            'allow_add'     => true,
                                            'allow_delete'  => true,
                                            'by_reference'  => false
                                            ))
    ;
}

当我编辑时,PoI我可以毫无问题地将照片添加到图库,但我无法删除任何内容.

我试图挂钩画廊PreUpdate,但它永远不会被调用.我用实体removePhotos方法打印输出,Gallery照片从图库中删除.然后我怀疑画廊永远不会坚持下去.

这是我坚持PoI编辑后的代码.

private function handleForm($elem, $is_new)
{
    $form = $this->createForm(new CircuitType, $elem);

    $request = $this->get('request');
    if ($request->getMethod() == 'POST') {
        $form->bind($request);

        if ($form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($elem);
            $em->flush();

            return $this->redirect($this->generateUrl('tessa_circuit_index'));
        }
    }

    return $this->render('TessaUserBundle:Circuits:add.'.'html'.'.twig',
        array(
            'form' => $form->createView(),
            'is_new' => $is_new,
        ));
}

Answer 1

关于处理这种状况的Symfony2食谱有文章.由于您具有OneToMany关系,因此必须在控制器中手动删除相关对象.

编辑:或者您可以使用Doctrine的孤儿删除功能.

class Gallery
{
    //...    

    /**
     * @ORM\OneToMany(targetEntity="Photo", mappedBy="gallery", cascade={"persist", "remove"}, orphanRemoval=true)
     */
    private $photos;

    //...

    public function removePhotos($photo)
    {
        $this->photos->remove($photo);
        $photo->setGallery(null);
    }
}