update

pkg/cart/mutation_subscription_added.go

@@ -0,0 +1,18 @@
+package cart
+
+import (
+	"fmt"
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+func SubscriptionAdded(grain *CartGrain, req *messages.SubscriptionAdded) error {
+	for i, item := range grain.Items {
+		if item.Id == req.ItemId {
+			grain.Items[i].SubscriptionDetailsId = req.DetailsId
+			grain.Items[i].OrderReference = req.OrderReference
+			grain.Items[i].IsSubscribed = true
+			return nil
+		}
+	}
+	return fmt.Errorf("item with ID %d not found", req.ItemId)
+}