public IHttpActionResult Update(OrderUM um)
        {
            try
            {
                Order model = AutoMapper.Mapper.Map <OrderUM, Order>(um);
                _orderService.UpdateOrder(model);
                _orderService.SaveOrderChanges();

                foreach (int couponItemId in um.CouponItemIds)
                {
                    CouponItem coupon = _couponItemService.GetCouponItem(couponItemId);
                    coupon.OrderId = model.Id;
                    coupon.IsUsed  = true;
                    _couponItemService.UpdateCouponItem(coupon);
                    _couponItemService.SaveCouponItemChanges();
                }

                OrderVM result = AutoMapper.Mapper.Map <Order, OrderVM>(model);
                return(Ok(result));
            }
            catch (Exception e)
            {
                return(InternalServerError(e));
            }
        }
        public IHttpActionResult Update(OrderUM um)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }
            try
            {
                Order model = AutoMapper.Mapper.Map <OrderUM, Order>(um);
                foreach (var item in um.OrderDetails)
                {
                    item.OrderId = um.Id;
                }
                _orderService.UpdateOrder(model);
                _orderService.SaveOrderChanges();

                OrderVM result = AutoMapper.Mapper.Map <Order, OrderVM>(model);
                return(Ok(result));
            }
            catch (Exception e)
            {
                return(InternalServerError(e));
            }
        }