/**
  * Label notification as unread
  *
  * @param \Illuminate\Http\Request $request
  * @param int $id
  *
  * @return Response
  */
 public function labelUnread(Request $request, $id)
 {
     $notification = Notification::findOrFail($id);
     $notification->labelUnread()->save();
     if ($request->ajax()) {
         return ['notification' => $notification, 'success' => true];
     } else {
         return redirect()->back();
     }
 }