public bool UpdateComment(EditAComment model)
        {
            using (var ctx = new ApplicationDbContext())
            {
                var commentToUpdate =
                    ctx
                    .Comments
                    .Single(e => e.CommentId == model.CommentId && e.UserId == _userId);
                commentToUpdate.CommentText = model.CommentText;

                return(ctx.SaveChanges() == 1);
            }
        }
        public IHttpActionResult Put(EditAComment commentToEdit)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var service = CreateCommentService();

            if (!service.UpdateComment(commentToEdit))
            {
                return(InternalServerError());
            }

            return(Ok());
        }