/**
  * Store a newly created resource in storage.
  *
  * @param Request $request
  * @param User    $user
  *
  * @return Response
  * @throws \HttpException
  */
 public function store(Request $request, User $user)
 {
     $this->requireUser($user);
     $toDoManager = new ToDoManager();
     if ($request->has('taskId')) {
         $this->validate($request, ['taskId' => 'integer']);
         $taskId = $request->input('taskId');
         /** @var Task $task */
         $task = Task::findOrFail($taskId);
         $toDoManager->addTaskToDo($task, $user);
     } elseif ($request->has('stickerId')) {
         $this->validate($request, ['stickerId' => 'integer']);
         $stickerId = $request->input('stickerId');
         /** @var Sticker $sticker */
         $sticker = Sticker::findOrFail($stickerId);
         $toDoManager->addStickerToDo($sticker, $user);
     } else {
         throw new HttpException(400, "taskId or stickerId is required");
     }
     return $this->response(['success' => true]);
 }