我正在使用Symfony2。 我有一个实体Post,它有一个标题和一个图片字段。
我的问题:当我创建一个帖子时,一切都很好,我有我的图片等等。但是当我想要修改它时,我遇到了一个问题,"图片"字段是一个已上传的文件,Symfony希望是一个文件类型,但它是一个字符串(已上传文件的路径):
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.
我遇到了这个问题,真的不知道该如何解决,非常感谢任何帮助!非常感谢!
以下是我用于 newAction() 和 modifyAction() 的 PostType.php(位于 Form/PostType.php),可能是导致问题的原因:
<?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';
}
}
这里是我的 帖子实体 (Entity/Post.php):
<?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() (Controller/PostController.php) 这个函数运行正常:
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' => $form->createView()));
}
这是我的modifyAction()函数(控制器/PostController.php):这个函数存在问题
public function modifyAction($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));
}