public IHttpActionResult AddComment(int id, CommentBindingModel model)
        {
            if (!ModelState.IsValid)
            {
                return(this.BadRequest(ModelState));
            }

            var userId           = RequestContext.Principal.Identity.GetUserId();
            var allIssueComments = issuesService.AddComment(id, userId, model);

            return(CreatedAtRoute("GetIssueComments", new { id = id }, allIssueComments));
        }