尝试在symfony中上传图片时出现问题

Question

所以我已经尝试了超过24小时并没有从ERROR的哪个地方赶来，试图一步一步地按照Symfony DOC How to Handle File Uploads with Doctrine然后当它点击上传按钮时我的页面表单我得到了这个错误：

StoreGeneratedPattern

我的实体页面：

none

生成表单的PageType：

Catchable Fatal Error: Argument 1 passed to Custom\CMSBundle\Entity\Page::setFile() must be an instance of Custom\CMSBundle\Entity\UploadedFile, instance of Symfony\Component\HttpFoundation\File\UploadedFile given, called in C:\Users\THINK\Desktop\PHP-Symfony2---Build_a_CMS-master\vendor\symfony\symfony\src\Symfony\Component\PropertyAccess\PropertyAccessor.php on line 442 and defined

PageController：

    <?php

namespace Custom\CMSBundle\Entity;

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

/**
 * Page
 *
 * @ORM\Table()
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class Page
{
    /**
     * @var integer
     *
     * @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="Category", inversedBy="pages")
     * @ORM\JoinColumn(name="category_id", referencedColumnName="id")
     */
    private $category;


    /**
     * @ORM\Column(type="string", length=255, nullable=true)
     */
    public $path;

    /**
     * Set path
     *
     * @param string $path
     * @return Page
     */
    public function setPath($path)
    {
        $this->path = $path;

        return $this;
    }

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

    /**
     * @Assert\File(maxSize="6000000")
     */
    private $file;

    private $temp;

    /**
     * Sets file.
     *
     * @param UploadedFile $file
     */
    public function setFile(UploadedFile $file = null)
    {
         $this->file = $file;
        // check if we have an old image path
        if (is_file($this->getAbsolutePath())) {
            // store the old name to delete after the update
            $this->temp = $this->getAbsolutePath();
            $this->path = null;
        } else {
            $this->path = 'initial';
        }
    }

    /**
     * @ORM\PrePersist()
     * @ORM\PreUpdate()
     */
    public function preUpload()
    {
        if (null !== $this->getFile()) {
            $this->path = $this->getFile()->guessExtension();
        }
    }

    /**
     * Get file.
     *
     * @return UploadedFile
     */
    public function getFile()
    {
        return $this->file;
    }



    public function getAbsolutePath()
    {
        return null === $this->path
            ? null
            : $this->getUploadRootDir().'/'.$this->path;
    }

    public function getWebPath()
    {
        return null === $this->path
            ? null
            : $this->getUploadDir().'/'.$this->path;
    }

    protected function getUploadRootDir()
    {
        // the absolute directory path where uploaded
        // documents should be saved
        return __DIR__.'/../../../../web/image'.$this->getUploadDir();
    }

    protected function getUploadDir()
    {
        // get rid of the __DIR__ so it doesn't screw up
        // when displaying uploaded doc/image in the view.
        return 'uploads/documents';
    }


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

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

        return $this;
    }

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

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

        return $this;
    }

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


    /**
     * Set category
     *
     * @param \Custom\CMSBundle\Entity\Category $category
     * @return Page
     */
    public function setCategory(\Custom\CMSBundle\Entity\Category $category = null)
    {
        $this->category = $category;

        return $this;
    }

    /**
     * Get category
     *
     * @return \Custom\CMSBundle\Entity\Category 
     */
    public function getCategory()
    {
        return $this->category;
    }


    /**
     * @ORM\PostPersist()
     * @ORM\PostUpdate()
     */
    public function upload()
    {
        if (null === $this->getFile()) {
            return;
        }

        // check if we have an old image
        if (isset($this->temp)) {
            // delete the old image
            unlink($this->temp);
            // clear the temp image path
            $this->temp = null;
        }

        // you must throw an exception here if the file cannot be moved
        // so that the entity is not persisted to the database
        // which the UploadedFile move() method does
        $this->getFile()->move(
            $this->getUploadRootDir(),
            $this->id.'.'.$this->getFile()->guessExtension()
        );

        $this->setFile(null);
    }

    /**
     * @ORM\PreRemove()
     */
    public function storeFilenameForRemove()
    {
        $this->temp = $this->getAbsolutePath();
    }

    /**
     * @ORM\PostRemove()
     */
    public function removeUpload()
    {
        $file = $this->getAbsolutePath();
        if ($file) {
            unlink($file);
        }
    }


}

Answer 1

所有内容都写在错误消息中。如果你没有写＆＃34;使用一些课程＆＃34;和＆＃34;使用＆＃34;它在代码中（例如在函数签名中） - 它在相同的（或全局的，只是不记得）命名空间中被搜索。阅读：namespaces
页面实体： 添加

use Symfony\Component\HttpFoundation\File\UploadedFile;