/**
  *
  * @param Request $request
  * @param Timer $timer
  * @return Response
  */
 public function update(Request $request, Timer $timer)
 {
     // Create an array with the new fields merged
     $data = array_compare($timer->toArray(), $request->only(['start', 'finish']));
     $timer->update($data);
     if ($request->has('activity_id')) {
         $timer->activity()->associate(Activity::findOrFail($request->get('activity_id')));
         $timer->save();
     }
     //        dd($timer);
     $finishDate = $this->calculateFinishDate($timer);
     $timer = $this->transform($this->createItem($timer, new TimerTransformer(['date' => $finishDate])))['data'];
     return response($timer, Response::HTTP_OK);
 }