Symfony2 Datei-upload: so speichern Sie die Datei Pfad in der Lehre?

Ich habe ein problem mit dem speichern der Pfad in der Lehre aus einer Datei hochladen. Verwendet habe ich das Beispiel von hier: Zu behandeln, wie Datei-Uploads mit Lehre

Der upload funktioniert, aber ich bekomme nicht den Pfad der Datei in der Datenbank gespeichert, und ich denke, dass die Rückrufe nicht arbeiten. Zumindest meine uploads nicht über eine Datei-Erweiterung.

Hier kommt mein controller:

   public function uploadAction()
{
$document = new Document();
//$form   = $this->createForm(new DocumentType(), $entity);


$form = $this->createFormBuilder($document)
    ->add('name')
    ->add('file')
    ->getForm()
;
if ($this->getRequest()->getMethod() === 'POST') {
    $form->bindRequest($this->getRequest());
    if ($form->isValid()) {

        $em = $this->getDoctrine()->getEntityManager();
        $em->persist($document);
        $em->flush();

        $this->redirect($this->generateUrl('document'));
    }
}

return  $this->render("ISClearanceBundle:Document:upload.html.twig",array('form' =>   $form->createView()));
}

Hier ist die Stelle:

 <?php

   namespace IS\ClearanceBundle\Entity;

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

  /**
   * IS\ClearanceBundle\Entity\Document
   * @ORM\Entity
   * @ORM\HasLifecycleCallbacks
   */
  class Document
 {
 /**
  * @var string $name
  */
private $name;

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

/**
 * @var integer $projectId
 */
private $projectId;

/**
 * @var integer $id
 */
private $id;

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

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

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

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

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

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

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

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

 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/documents';
}

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

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

Ich weiß wirklich nicht, wie Sie speichern den Pfad zu der Datenbank und wie man Debuggen.

Vielen Dank für jede Hilfe!!!