/**
* save file to db
* @param string $file_name
* @param string $action
* @param bool $is_cached
* @return integer file id
*/
protected function saveFile($file_name, $action)
{
$f = new Image();
$f->setUidType(User::typeToInt($this->auth->getType()));
$f->setUri($this->pic_dir . $file_name);
$f->setUid($this->auth->getUserObject()->getId());
$f->setType(static::actionToType($action));
$this->em->persist($f);
$this->em->flush();
$id = $f->getId();
$this->em->clear();
unset($f);
return $id;
}