public Task<HttpResponseMessage> Post([FromBody]dynamic body)
        {
            var command = new CreateOrderCommand(
                orderItems: body.orderItems.ToObject<List<CreateOrderItemCommand>>()
            );

            var order = _service.Create(command, User.Identity.Name);
            return CreateResponse(HttpStatusCode.Created, order);
        }
        public Order Create(CreateOrderCommand command, string email)
        {
            var user = _userRepository.GetByEmail(email);
            var orderItems = new List<OrderItem>();
            foreach (var item in command.OrderItems)
            {
                var orderItem = new OrderItem();
                var product = _productRepository.Get(item.Product);
                orderItem.AddProduct(product, item.Quantity, item.Price);
                orderItems.Add(orderItem);
            }

            var order = new Order(orderItems, user.Id);
            order.Place();
            _orderRepository.Create(order);

            if (Commit())
                return order;

            return null;
        }