public function approve()
 {
     if (Request::ajax()) {
         $pending = PendingGroup::find(Input::get('id'));
         Group::find($pending->group_id)->push('students_id', $pending->student_id, true);
         $pending->delete();
         return Response::json(array('code' => "00", 'stats' => MessageController::getStats()));
     }
 }