Fix quantities

src/Cashier/NCafe.Cashier.Domain/Commands/PlaceOrder.cs

@@ -28,6 +28,9 @@ public async Task Handle(PlaceOrder command, CancellationToken cancellationToken
         await _repository.Save(order);
 
         await _publisher.Publish(
-            new OrderPlacedMessage(order.Id, order.Items.Select(x => (Messages.OrderItem)x).ToArray(), order.Customer));
+            new OrderPlacedMessage(
+                order.Id,
+                order.Items.GroupBy(i => i.ProductId).Select(i => new Messages.OrderItem(i.First().ProductId, i.First().Name, i.Sum(x => x.Quantity), i.First().Price)).ToArray(),
+                order.Customer));
     }
 }

src/UI/NCafe.Web/Pages/Cashier/Index.razor

@@ -112,7 +112,7 @@
         {
             var response = await Http.PostAsJsonAsync(
                 $"{_baseAddress}/orders/add-item",
-                new { OrderId = _order.Id, item.ProductId, item.Quantity });
+                new { OrderId = _order.Id, item.ProductId, Quantity = 1 });
             response.EnsureSuccessStatusCode();
         }
         catch (Exception ex)