public async Task <IHttpActionResult> Post(User user)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            db.Users.Add(user);
            await db.SaveChangesAsync();

            return(Ok(UsersViewModel.MapFrom(user)));
        }
        public async Task <IHttpActionResult> Delete(long id)
        {
            User user = await db.Users.FindAsync(id);

            if (user == null)
            {
                return(NotFound());
            }
            else
            {
                db.Users.Remove(user);
                await db.SaveChangesAsync();

                return(Ok(UsersViewModel.MapFrom(user)));
            }
        }