从oneToMany关系中删除一个项目 [英] Delete an item from oneToMany relationship

问题描述

我有以下画廊实体

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;

    /* ... */
}

gallery 与 manyToOne 与 PointOfInterest 实体的关系链接。这是声明

This gallery is linked with a manyToOne relationship to a PointOfInterest entity. Here is the declaration

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

我还使用表单更新 PointOfInterest 实体。这是表单声明

I also use a Form to update the PointOfInterest entity. Here is the form declaration

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 PoI 我可以添加照片到画廊没有问题，但我不能删除任何东西。

When I edit the PoI I can add photos to the gallery without problem, but I can't delete anything.

我试图挂钩画廊 PreUpdate ，但从未被调用。我在 removePhotos 方法中打印了 Gallery 实体的输出，照片从图库中删除。然后我怀疑画廊永远不会被保留下来。

I tried to hook on gallery PreUpdate, but it is never called. I printed output in removePhotos method of Gallery entity, and the photos are removed from the gallery. I then suspect the Gallery to never be persisted.

编辑后，我坚持 PoI

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,
        ));
}

推荐答案

有关于处理这种情况的Symfony2菜谱中的内容。由于您有OneToMany关系，您必须在控制器中手动删除相关对象。

There is article in Symfony2 cookbook about handling this type of situation. As you have OneToMany relationship, you have to remove related objects manually in controller.

编辑：
或者您可以使用Doctrine的孤儿删除功能。

Or you can make use of Doctrine's orphan removal feature.

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);
    }
}

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