public JsonResult GetAll()
        {
            var users = _userService.GetAllUsers().ToList();

            if (!users.Any())
            {
                return(ErrorResponse());
            }

            return(MultipleResults(UserViewModelHelpers.ConverToViewModels(users)));
        }
        public JsonResult GetById(int id)
        {
            var user = _userService.FindById(id);

            if (user == null)
            {
                return(ErrorResponse("Not found"));
            }

            return(SingleResult(UserViewModelHelpers.ConvertToViewModel(user)));
        }