use Symfony\Component\Form\Form;
use Symfony\Component\Form\CollectionField;
use Symfony\Component\Form\TextField;
use FSC\AccountBundle\Entity\User;
use Symfony\Component\Form\FileField;


class EditProfilForm extends Form
{

    public function configure()
    {
        $this->add(new FileField('avatar', array('secret' => sha1(uniqid()) )));
        parent::configure();
    }

}


$form = EditProfilForm::create($this->get('form.context'), 'user');

    if('POST' == $this->get('request')->getMethod())
        {
          $files = $this->get('request')->files->get($form->getName());

       $form->bind($this->get('request'), $user);
       if($form->isValid())
       {

       if (!empty($files['avatar']))
        {
        $file = $files['avatar']['file'];

        $dir=__DIR__.'/../../../../web/bundles/images';

                $file->move($dir, $file->getName());

            $avatar = $file->getName();
            $user->setAvatar($avatar);

            $user->setupdatedAt(new \DateTime('now'));
            $em->persist($user);
        $em->flush();
         }

       }
  }