public function reposition()
 {
     if (\Request::has('item')) {
         $i = 0;
         foreach (\Request::get('item') as $id) {
             $i++;
             $item = GallerySerie::find($id);
             $item->position = $i;
             $item->save();
         }
         return \Response::json(array('success' => true));
     } else {
         return \Response::json(array('success' => false));
     }
 }