public IActionResult AddAnswer(AnswerBindingModel bindingModel)
        {
            if (ModelState.IsValid)
            {
                var user   = userMgr.FindByNameAsync(User.Identity.Name).Result;
                var answer = discussService.AddAnswer(bindingModel.Content, user, bindingModel.QuestionId);
                if (answer == null)
                {
                    return(RedirectToAction(Actions.SomethingWentWrong, Paths.Error));
                }
            }
            var returnUrl = $"/{Paths.Discussions}/{Actions.QuestionDetails}/?{Query.Id}={bindingModel.QuestionId}";

            return(Redirect(returnUrl));
        }