public function show($id)
 {
     return Feedback::findOrFail($id);
 }
 public function postFeedbacksSave(Request $request)
 {
     $this->validate($request, ['fid' => 'required|exists:feedbacks,id', 'editor' => 'required'], ['editor.required' => 'Укажите ответ на отзыв']);
     $feedback = \App\Feedback::findOrFail($request->input('fid'));
     $answer = $feedback->answer;
     if (!$answer) {
         $answer = new \App\Answer();
         $answer->feedback_id = $feedback->id;
     }
     $answer->read_at = null;
     $answer->text = $request->input('editor');
     $answer->save();
     return redirect('admin/feedbacks');
 }