public async Task <IActionResult> BackAsync(int id, [FromBody] Share.SingleContent model)
        {
            Domain.Questions.Question question = Domain.Questions.Hub.GetQuestion(id);
            Domain.Resp resp = await question.BackAsync(model.Content);

            return(Pack(resp));
        }
        public async Task <IActionResult> ModifyAnswerAsync(int id, [FromBody] Share.SingleContent model)
        {
            Domain.Answers.Answer answer = Domain.Answers.Hub.GetAnswer(id);
            var r = await answer.ModifyAsync(model.Content);

            return(Pack(r));
        }