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我正在使用Symfony2。 我有一個實體郵政有一個標題和一個圖片字段。Symfony 2 |修改具有文件（圖片）字段的對象時出現異常
我的問題：當我創建一個帖子，我有我的照片等等時，一切都很好。但是當我想修改它時，我有一個上傳文件的「圖片」字段的問題，Symfony想要文件類型，它有一個字符串（上傳文件的路徑）：
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.
我真的堅持了這個問題，真不知道如何解決它，任何幫助將不勝感激！非常感謝！
這是我的PostType.php（其在newAction（）和modifiyAction（）使用）和這可能導致問題（窗體/ 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';
}
}
這裏是我後實體（實體/ 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
}
這裏是我的newAction（）（控制器/ PostController.php）每個正常工作與此功能：
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' => $form->createView()));
}
這裏是我的modifyAction（）（控制器/ PostController.php）：有此功能存在問題
public function modifyAction($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));
}
你知道爲什麼這最終解決了問題嗎？ – nbro