public function resolveQuestion()
 {
     $request = Request::capture();
     $token = $request->input('token');
     $answerId = $request->input('answerId');
     if ($answerId == null) {
         return Utility::response_format(Utility::RESPONSE_CODE_Error, '', 'answerId不能为空');
     }
     $userId = AuthController::getUserIdByToken($token);
     if ($userId == null) {
         return Utility::response_format(Utility::RESPONSE_CODE_AUTH_ERROR, '', '认证失败');
     }
     $answer = Answer::where('id', $answerId)->first();
     $question = Question::where('id', $answer->question_id)->first();
     if ($question->user_id != $userId) {
         return Utility::response_format(Utility::RESPONSE_CODE_Error, '', '不是问题所属用户');
     }
     $isResolved = $answer->is_resolved;
     if ($isResolved) {
         return Utility::response_format(Utility::RESPONSE_CODE_Error, '', '问题已解决');
     }
     $answer->is_resolved = 1;
     $answer->save();
     return Utility::response_format(Utility::RESPONSE_CODE_SUCCESS, '', '请求成功');
 }