我目前拥有的标准(非ajax)文件上传(并且适用于同步调用)看起来像这样

控制器节选

...

    $entity  = new Image();
    $request = $this->getRequest();
    $form    = $this->createForm(new ImageType($createAction),$entity);
    $form->bind($request); // <-- Find a way to make this connection manually?!

    //check that a file was chosen
    $fileExists = isset($entity->file);

    if ( ($form->isValid()) && ($fileExists) ) {

        $em = $this->getDoctrine()->getManager();

        $em->persist($entity);
        $em->flush();

    }

    ...

表单类型：表单只接受文件和名称：

class ImageType extends AbstractType
{

    ...

    public function buildForm(FormBuilderInterface $builder,array $options)
    {

        $createAction = $this->createAction;

        if ($createAction) {        
            $builder
                ->add('file')
            ;
        }

        $builder
            ->add('name','text',array('label' => 'Namn'))
        ;
    }

    ...

}

正如我所理解的(或者说显然不明白)使用symfony2和doctrine的文件上传系统,在这个调用的引擎盖下有相当多的魔力

$form->bind($request);

例如,如果我跳过这个bind(),而是尝试像这样手动创建Image实体……

$request = $this->getRequest();
    $parent = $request->request->get('parent');
    $file = $request->request->get('file1');
    $name = $request->request->get('name');

    $entity->setName( $name );
    $entity->setFile( $file );
    $entity->setFolder( null );

…我发现它甚至没有setFile(),因此以其他方式处理.这是Image实体：

namespace BizTV\MediaManagementBundle\Entity;

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

/**
 * BizTV\MediaManagementBundle\Entity\Image
 *
 * @ORM\Table(name="image")
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class Image
{
    /**
     * @var integer $id
     *
     * @ORM\Column(name="id",type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string $name
     *
     * @ORM\Column(name="name",type="string",length=255)
     * @Assert\NotBlank(message = "Bilden måste ha ett namn")
     */
    private $name;

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

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

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


//The deleteRequested variable is to flag that an image has been deleted by user.
//Due to slideshow issues we can however not delete the image right away,we can't risk to remove it from the
//cache manifest before the slideshow round is up.

    /**
     * @var time $deleteRequested
     * 
     * @ORM\Column(name="delete_requested",type="datetime",nullable=true)
     */
    private $deleteRequested;


    /**
    * @var object BizTV\BackendBundle\Entity\company
    *  
    * @ORM\ManyToOne(targetEntity="BizTV\BackendBundle\Entity\company")
    * @ORM\JoinColumn(name="company",referencedColumnName="id",nullable=false)
    */
    protected $company;     

    /**
    * @var object BizTV\MediaManagementBundle\Entity\Folder
    *  
    * @ORM\ManyToOne(targetEntity="BizTV\MediaManagementBundle\Entity\Folder")
    * @ORM\JoinColumn(name="folder",nullable=true)
    */
    protected $folder;


    /**
     * @Assert\File(maxSize="12000000")
     */
     public $file;

    /**
     * @ORM\OneToOne(targetEntity="BizTV\MediaManagementBundle\Entity\QrImage",mappedBy="image")
     */
    protected $qr;

    /**
     * @ORM\PrePersist()
     * @ORM\PreUpdate()
     */
    public function preUpload()
    {
        if (null !== $this->file) {
            // do whatever you want to generate a unique name
            $this->path = sha1(uniqid(mt_rand(),true)).'.'.$this->file->guessExtension();
        }
    }

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

        // if there is an error when moving the file,an exception will
        // be automatically thrown by move(). This will properly prevent
        // the entity from being persisted to the database on error
        $this->file->move($this->getUploadRootDir(),$this->path);

        unset($this->file);
    }

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

    }

    protected function getUploadDir()
    {
        // get rid of the __DIR__ so it doesn't screw when displaying uploaded doc/image in the view.
        return 'uploads/images/'.$this->getCompany()->getId();
    }


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

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

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

    /**
     * Set width
     *
     * @param integer $width
     */
    public function setWidth($width)
    {
        $this->width = $width;
    }

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

    /**
     * Set height
     *
     * @param integer $height
     */
    public function setHeight($height)
    {
        $this->height = $height;
    }

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

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

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

    /**
     * Set company
     *
     * @param BizTV\BackendBundle\Entity\company $company
     */
    public function setCompany(\BizTV\BackendBundle\Entity\company $company)
    {
        $this->company = $company;
    }

    /**
     * Get company
     *
     * @return BizTV\BackendBundle\Entity\company 
     */
    public function getCompany()
    {
        return $this->company;
    }

    /**
     * Set folder
     *
     * @param BizTV\MediaManagementBundle\Entity\Folder $folder
     */
    public function setFolder(\BizTV\MediaManagementBundle\Entity\Folder $folder = NULL)
    {
        $this->folder = $folder;
    }

    /**
     * Get folder
     *
     * @return BizTV\MediaManagementBundle\Entity\Folder 
     */
    public function getFolder()
    {
        return $this->folder;
    }


    /**
     * Set qr
     *
     * @param BizTV\MediaManagementBundle\Entity\QrImage $qr
     */
    public function setQr(\BizTV\MediaManagementBundle\Entity\QrImage $qr = null)
    {
        $this->qr = $qr;
    }

    /**
     * Get qr
     *
     * @return BizTV\MediaManagementBundle\Entity\QrImage 
     */
    public function getQr()
    {
        return $this->qr;
    }


    /**
     * Set deleteRequested
     *
     * @param date $deleteRequested
     */
    public function setDeleteRequested($deleteRequested = null)
    {
        $this->deleteRequested = $deleteRequested;
    }

    /**
     * Get deleteRequested
     *
     * @return date 
     */
    public function getDeleteRequested()
    {
        return $this->deleteRequested;
    }
}