public function update($id, Request $request)
 {
     $question = Question::findOrFail($id);
     foreach ($request->choices as $choice) {
         $choiceModels[] = new Choice(['choice_text' => $choice]);
     }
     $data = $request->all();
     $data["user_id"] = \Auth::user()->id;
     Choice::where("question_id", $id)->delete();
     $question->update($data);
     $question->choices()->saveMany($choiceModels);
     session()->flash('flash_msg', 'You have successfully added a poll.');
     return redirect('/');
 }