我无法在Symfony 3中

Question

我找不到几天的解决方案来解决我的问题。我想在创建帖子时上传多张图片。 My Post实体与Image Entity具有OneToMany关系。我在PostType中使用嵌入的表单。它是ImageType :: class的CollectionType。为了管理我的上传功能，我写了一个名为ImageUploadListener的事件监听器，它注入了我的名为FileUploader的自定义服务。

当处理preUpdate和prePersist事件时，此侦听器调用uploadFile函数。此函数从我的FileUploader调用我的上传函数，将图像/文件...移动到目标目录并返回文件名。

之后，我尝试实例化一个Image Entity并设置适当的数据。但它不起作用，只有一个文件似乎存储正确但在我的数据库中有一个不需要的额外条目。 （在我的图像表中，对于上传的一个图像，我有一个id为1的条目，例如post_id设置为NULL，文件字段设置为/ tmp / random number）。

拜托，你能帮助我吗？

发布实体

namespace UserBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * Post
 *
 * @ORM\Table(name="post")
 * @ORM\Entity(repositoryClass="UserBundle\Repository\PostRepository")
 */
class Post
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="Title", type="string", length=255)
     */
    private $title;

    /**
     * @var string
     *
     * @ORM\Column(name="Content", type="text")
     */
    private $content;


    /**
     * @ORM\ManyToOne(targetEntity="User", inversedBy="posts")
     * @ORM\JoinColumn(name="user_id", referencedColumnName="id")
    */
    private $user;

    /**
     * @ORM\OneToMany(targetEntity="Image", mappedBy="post", cascade={"persist", "remove"})
     */
    private $images;

    /**
     * Get id
     *
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set title
     *
     * @param string $title
     *
     * @return Post
     */
    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    /**
     * Get title
     *
     * @return string
     */
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * Set content
     *
     * @param string $content
     *
     * @return Post
     */
    public function setContent($content)
    {
        $this->content = $content;

        return $this;
    }

    /**
     * Get content
     *
     * @return string
     */
    public function getContent()
    {
        return $this->content;
    }

    /**
     * Set post
     *
     * @param \
     *
     * @return Post
     */
    public function setUser($user)
    {
        $this->user = $user;

        return $this;
    }

    /**
     * Get post
     *
     * @return \?
     */
    public function getUser()
    {
        return $this->user;
    }
    /**
     * Constructor
     */
    public function __construct()
    {
        $this->images = new ArrayCollection();
    }

    /**
     * Add image
     *
     * @param \UserBundle\Entity\Image $image
     *
     * @return Post
     */
    public function addImage(\UserBundle\Entity\Image $image)
    {
        $this->images[] = $image;

        return $this;
    }

    /**
     * Remove image
     *
     * @param \UserBundle\Entity\Image $image
     */
    public function removeImage(\UserBundle\Entity\Image $image)
    {
        $this->images->removeElement($image);
    }

    /**
     * Get images
     *
     * @return \Doctrine\Common\Collections\Collection
     */
    public function getImages()
    {
        return $this->images;
    }
}

图片实体

namespace UserBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * @ORM\Entity(repositoryClass="UserBundle\Entity\ImageRepository")
 */
class Image
{
  /**
   * @ORM\Column(name="id", type="integer")
   * @ORM\Id
   * @ORM\GeneratedValue(strategy="AUTO")
   */
  private $id;


  /**
   * @ORM\Column(type="string", nullable=true)
   */
  private $file;

  public function setFile($file)
  {
      $this->file = $file;
      return $this;
  }

  public function getFile()
  {
      return $this->file;
  }


  /**
   * @ORM\ManyToOne(targetEntity="Post", inversedBy="images")
   * @ORM\JoinColumn(name="post_id", referencedColumnName="id")
  */
  private $post;


  /**
   * Get id
   *
   * @return integer
   */
  public function getId()
  {
      return $this->id;
  }


  /**
   * Set post
   *
   * @param \UserBundle\Entity\Post $post
   *
   * @return Image
   */
  public function setPost(\UserBundle\Entity\Post $post = null)
  {
      $this->post = $post;

      return $this;
  }

  /**
   * Get post
   *
   * @return \UserBundle\Entity\Post
   */
  public function getPost()
  {
      return $this->post;
  }
}

PostType

namespace UserBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
//use Ivory\CKEditorBundle\Form\Type\CKEditorType;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use UserBundle\Entity\Post;


class PostType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('title')
            ->add('content')
            ->add('images', CollectionType::class, array (
                'entry_type' => ImageType::class,
                'entry_options' => array('label' => false),
                'allow_add' => true,
                'allow_delete' => true
            ))
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            //'data_class' => 'UserBundle\Entity\Post',
            'data_class' => Post::class,
            //'csrf_protection' => false
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'userbundle_post';
    }


}

将ImageType     命名空间UserBundle \ Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use UserBundle\Entity\Image;

class ImageType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('file', FileType::class, [
                'required' => false,
                'data_class' => null,
            ])
        ;
    }

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => Image::class,
            //'csrf_protection' => false
        ));
    }

    /**
     * {@inheritdoc}
     */
    public function getBlockPrefix()
    {
        return 'userbundle_image';
    }
}

编辑：ImageUploadListener

//src/UserBundle/EventListener/ImageUploadListener.php
namespace UserBundle\EventListener;

use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\HttpFoundation\File\File;

use Doctrine\ORM\Event\LifecycleEventArgs;
use Doctrine\ORM\Event\PreUpdateEventArgs;

use UserBundle\Entity\User;
use UserBundle\Entity\Post;
use UserBundle\Entity\Image;

use UserBundle\Service\FileUploader;


class ImageUploadListener
{
    private $uploader;


    public function __construct(FileUploader $uploader)
    {
        $this->uploader = $uploader;
    }

    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $this->uploadFile($entity);
    }

    public function preUpdate(PreUpdateEventArgs $args)
    {
        $entity = $args->getEntity();
        $this->uploadFile($entity);
    }

    private function uploadFile($entity)
    {
        if ($entity instanceof Post) {

            $post = $entity;
            $images = $post->getImages();
            foreach ($images as $image) {
                if ($image->getFile() instanceof UploadedFile) {
                    $imageName = $this->uploader->upload($image->getFile());

                    // to avoid persisting FileObject in DB
                    $post->removeImage($image);

                    $postImage = new Image();
                    $postImage->setFile($imageName);
                    $postImage->setPost($post);
                    $post->addImage($postImage);
                }
            }
        }
        return;
    }
}

FileUploader

namespace UserBundle\Service;

use Symfony\Component\HttpFoundation\File\UploadedFile;

class FileUploader
{
    private $targetDir;
    public function __construct($targetDir)
    {
        $this->targetDir = $targetDir;
    }

    public function upload(UploadedFile $file)
    {

        $fileName = md5(uniqid()).'.'.$file->guessExtension();
        $file->move($this->getTargetDir(), $fileName);
        return $fileName;
    }

    public function getTargetDir()
    {
        return $this->targetDir;
    }
}