题 Symfony 2 |修改具有文件(图片)字段的对象时形成异常


我正在使用Symfony2。 我有一个实体 岗位 有标题和图片字段。

 我的问题 : 当我创建一个帖子时,一切都很好,我有我的图片等。但是当我想修改它时,我对“图片”字段有问题,这是一个上传的文件,Symfony想要一个文件类型,它有一个字符串(上传文件的路径):

The form's view data is expected to be an instance of class Symfony\Component\HttpFoundation\File\File, but is a(n) string. You can avoid this error by setting the "data_class" option to null or by adding a view transformer that transforms a(n) string to an instance of Symfony\Component\HttpFoundation\File\File. 

我真的坚持这个问题,真的不知道如何解决它,任何帮助将不胜感激!非常感谢!

这是我的 PostType.php (用于newAction()和modifiyAction())并且可能导致问题(表格/ PostType.php):

<?php
namespace MyBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\HttpFoundation\File\UploadedFile;

use MyBundle\Entity\Post;

class PostType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
        ->add('title')
        ->add('picture', 'file');//there is a problem here when I call the modifyAction() that calls the PostType file.
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'MyBundle\Entity\Post',
        );
    }

    public static function processImage(UploadedFile $uploaded_file, Post $post)
    {
        $path = 'pictures/blog/';
        //getClientOriginalName() => Returns the original file name.
        $uploaded_file_info = pathinfo($uploaded_file->getClientOriginalName());
        $file_name =
            "post_" .
            $post->getTitle() .
            "." .
            $uploaded_file_info['extension']
            ;

        $uploaded_file->move($path, $file_name);

        return $file_name;
    }

    public function getName()
    {
        return 'form_post';
    }
}

这是我的 发布实体 (实体/ post.php中):

<?php

namespace MyBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

use Symfony\Component\Validator\Constraints as Assert;

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

    /**
     * @ORM\Column(type="string", length=255, nullable=true)
     * @Assert\Image(
     *      mimeTypesMessage = "Not valid.",
     *      maxSize = "5M",
     *      maxSizeMessage = "Too big."
     *      )
     */
    private $picture;

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

   //getters and setters
   }

这是我的 newAction() (控制器/ PostController.php每个都可以正常使用此功能

public function newAction()
{
    $em = $this->getDoctrine()->getEntityManager();
    $post = new Post();
    $form = $this->createForm(new PostType, $post);
    $post->setPicture("");
    $form->setData($post);
    if ($this->getRequest()->getMethod() == 'POST') 
    {
        $form->bindRequest($this->getRequest(), $post);
        if ($form->isValid()) 
        {
            $uploaded_file = $form['picture']->getData();
            if ($uploaded_file) 
            {
                $picture = PostType::processImage($uploaded_file, $post);
                $post->setPicture('pictures/blog/' . $picture);
            }
            $em->persist($post);
            $em->flush();
            $this->get('session')->setFlash('succes', 'Post added.');

            return $this->redirect($this->generateUrl('MyBundle_post_show', array('id' => $post->getId())));
        }
    }

    return $this->render('MyBundle:Post:new.html.twig', array('form' => $form->createView()));
}

这是我的 modifyAction() (控制器/ PostController.php):此功能存在问题

public function modifyAction($id)
{
    $em = $this->getDoctrine()->getEntityManager();
    $post = $em->getRepository('MyBundle:Post')->find($id);
    $form = $this->createForm(new PostType, $post);//THIS LINE CAUSES THE EXCEPTION
    if ($this->getRequest()->getMethod() == 'POST') 
    {
        $form->bindRequest($this->getRequest(), $post);
        if ($form->isValid()) 
        {
            $uploaded_file = $form['picture']->getData();
            if ($uploaded_file) 
            {
                $picture = PostType::processImage($uploaded_file, $post);
                $post->setPicture('pictures/blog/' . $picture);
            }
            $em->persist($post);
            $em->flush();
            $this->get('session')->setFlash('succes', 'Modifications saved.');

            return $this->redirect($this->generateUrl('MyBundle_post_show', array('id' => $post->getId())));
        }
    }
    return $this->render('MyBundle:Post:modify.html.twig', array('form' => $form->createView(), 'post' => $post));
}

18
2018-01-20 09:35


起源




答案:


我解决了问题设置 data_class 至 null 如下:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
    ->add('title')
    ->add('picture', 'file', array('data_class' => null)
    );
}

43
2018-03-21 11:07



你有没有弄清楚为什么这最终会解决问题? - nbro


我建议你阅读使用Symfony和Doctrine的文件上传文档 如何使用Doctrine处理文件上载 并强烈建议该部分 生命周期回调

在一个简介中,您通常在表单中使用'file'变量(参见文档),您可以在选项中添加不同的标签,然后在“图片”字段中,您只需存储文件的名称,因为当您需要时src文件你可以调用getWebpath()方法。

->add('file', 'file', array('label' => 'Post Picture' )
);

调用你的树枝模板

<img src="{{ asset(entity.webPath) }}" />

3
2018-02-01 15:55





请在下面更改 PostType.php

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
    ->add('title')
    ->add('picture', 'file', array(
            'data_class' => 'Symfony\Component\HttpFoundation\File\File',
            'property_path' => 'picture'
        )
    );
}

1
2018-01-20 12:03



嗨@Reveclaire请告诉我这是否有帮助。如果它出现一些错误,你可以删除'property_path'atrribute。否则保持它。 - OMG
嗨@OMG!非常感谢您的回答。我按照你的说法修改了PostType.php(有和没有'property_path',不幸的是我仍然有同样的错误)。 - Reveclair
我解决了将data_class设置为null的问题。感谢您让我走上正轨。 - Reveclair