使用文件上传编辑表单后文件“”不存在

Question

我正在尝试为我的任务实体上传文件。我使用两个来源： http://symfony.com/doc/3.4/controller/upload_file.html and Symfony2 file upload step by step 但我不知道如何在编辑过程中保留上传的文件。

我不确定我是否正确实施了该部分：

当我尝试编辑任何任务时，我的表单一直在抱怨：

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.

所以我修改了 getter getBrochure() 在我要扩展的 PDF 文件的任务实体中。请看下面我的 getBrochure 方法这是我实体的代码：

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\HttpFoundation\File\File;

/**
 * Task
 *
 * @ORM\Table(name="task")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\TaskRepository")
 */
class Task
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

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

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="datetime", type="datetime")
     */
    private $datetime;

    /**
     * @ORM\ManyToMany(targetEntity="Category", inversedBy="tasks")
     * @ORM\JoinTable(name="categories_tasks")
     */
    private $categories;

    /**
     * @ORM\Column(type="text")
     */
    private $description;

    /**
     * @ORM\Column(type="string")
     *
     * @Assert\File(mimeTypes={ "application/pdf" })
     */
     private $brochure;


    public function __construct() {
        $this->categories = new \Doctrine\Common\Collections\ArrayCollection();
    }

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

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Task
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

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

    /**
     * Set datetime
     *
     * @param \DateTime $datetime
     *
     * @return Task
     */
    public function setDatetime($datetime)
    {
        $this->datetime = $datetime;

        return $this;
    }

    /**
     * Get datetime
     *
     * @return \DateTime
     */
    public function getDatetime()
    {
        return $this->datetime;
    }

    public function getCategories()
    {
        return $this->categories;
    }

    public function setCategories(Category $categories)
    {
        $this->categories = $categories;
    }

    public function getDescription()
    {
        return $this->description;
    }

    public function setDescription($description)
    {
        $this->description = $description;
    }

    public function getBrochure()
    {
        //return $this->brochure;
        return new File($this->brochure);
    }

    public function setBrochure($brochure)
    {
        $this->brochure = $brochure;

        return $this;
    }

    public function __toString() {
        return $this->name;
    }
}

?>

结果是我可以加载编辑页面，但是文件上传字段是空的，没有我上传任何文件的信息。我不确定是否应该有任何信息，但我在数据库中看到文件名在那里，并且在 web 文件夹中也有上传的文件。当我更改任务中的任何内容并清除文件保存时，当我尝试启动编辑页面时，我看到：

The file "" does not exis

我清楚了什么，因为此任务的文件列已清除。那么，当我不想上传新文件时，如何在编辑过程中保留文件？

这是我的任务类型

<?php

namespace AppBundle\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\FileType;

class TaskType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name')->add('datetime')->add('categories')
            ->add('description', 'Ivory\CKEditorBundle\Form\Type\CKEditorType', array())
            ->add('brochure', FileType::class, array('label' => 'Broszurka (PDF)', 'required' => false));
    }

    /**
     * {@inheritdoc}
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\Task'
        ));
    }

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


}

这是我的 TaskController（仅编辑操作）

/**
 * Displays a form to edit an existing task entity.
 *
 * @Route("/{id}/edit", name="task_edit")
 * @Method({"GET", "POST"})
 */
public function editAction(Request $request, Task $task)
{
    $deleteForm = $this->createDeleteForm($task);
    $editForm = $this->createForm('AppBundle\Form\TaskType', $task);
    $editForm->handleRequest($request);

    if ($editForm->isSubmitted() && $editForm->isValid()) {
        $this->getDoctrine()->getManager()->flush();

        return $this->redirectToRoute('task_edit', array('id' => $task->getId()));
    }

    return $this->render('task/edit.html.twig', array(
        'task' => $task,
        'edit_form' => $editForm->createView(),
        'delete_form' => $deleteForm->createView(),
    ));
}

任务实体：

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\HttpFoundation\File\File;

/**
 * Task
 *
 * @ORM\Table(name="task")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\TaskRepository")
 */
class Task
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

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

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="datetime", type="datetime")
     */
    private $datetime;

    /**
     * @ORM\ManyToMany(targetEntity="Category", inversedBy="tasks")
     * @ORM\JoinTable(name="categories_tasks")
     */
    private $categories;

    /**
     * @ORM\Column(type="text")
     */
    private $description;

    /**
     * @ORM\Column(type="string")
     *
     * @Assert\File(mimeTypes={ "application/pdf" })
     */
     private $brochure;


    public function __construct() {
        $this->categories = new \Doctrine\Common\Collections\ArrayCollection();
    }

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

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Task
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

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

    /**
     * Set datetime
     *
     * @param \DateTime $datetime
     *
     * @return Task
     */
    public function setDatetime($datetime)
    {
        $this->datetime = $datetime;

        return $this;
    }

    /**
     * Get datetime
     *
     * @return \DateTime
     */
    public function getDatetime()
    {
        return $this->datetime;
    }

    public function getCategories()
    {
        return $this->categories;
    }

    public function setCategories(Category $categories)
    {
        $this->categories = $categories;
    }

    public function getDescription()
    {
        return $this->description;
    }

    public function setDescription($description)
    {
        $this->description = $description;
    }

    public function getBrochure()
    {
        //return $this->brochure;
        return new File($this->brochure);
    }

    public function setBrochure($brochure)
    {
        $this->brochure = $brochure;

        return $this;
    }

    public function __toString() {
        return $this->name;
    }
}

?>

Answer 1

你应该检查文件然后，如果用户没有select文件，Select来自数据库的文件名

 if ($editForm->isSubmitted() && $editForm->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $form->handleRequest($request);
            $TaskRepo=$em->getRepository('AppBundle:Task');
            $Taskdata = $TaskRepo->find($id);///id task
            $Taskdata->setName($form->get('name')->getData());
            $Taskdata->setDescription($form->get('description(')->getData());
            $Taskdata->setDatetime(new \DateTime('now'));
    if($form->get('brochure')->getData() != ""){////Check the file selection status

             $file2 = $form->get('brochure')->getData();
             $fileName2 = md5(uniqid()).'.'.$file2->guessExtension();
             $file2->move(
             $this->getParameter('brochures_directory'), $fileName2);
             $Taskdata->setBrochure($fileName2);
        }
         $em->flush();
     }

Answer 2

好的我在写评论并添加任务实体代码几秒钟后发现了问题。在 getBrochure 方法中，我尝试为每个 Task 实例创建 File 对象，即使它没有任何小册子，所以解决方案是使用：

public function getBrochure()
{
    return $this->brochure;
    //return new File($this->brochure);
}

使用文件上传编辑表单后文件“”不存在

The file "" does not exist after editing the form with file upload

php

file-upload

symfony

symfony-3.3