/**
  * @param $group_id
  * @throws GroupNotFoundException
  */
 public function findGroupById($group_id)
 {
     try {
         return Groups::find($group_id);
     } catch (\Illuminate\Database\Eloquent\ModelNotFoundException $e) {
         throw new GroupNotFoundException(trans('user-management::messages.group_not_found'), array(trans('user-management::messages.group_not_found')));
     }
 }