better

cmd/cart/mutation_order_created.go

@@ -32,22 +32,17 @@ import (
 //   - Relies on the higher-level guarantee that Apply() calls are serialized
 //     per grain. If out-of-order events are possible, embed versioning or
 //     timestamps in the mutation and compare before applying changes.
-func init() {
-	RegisterMutation[messages.OrderCreated](
-		"OrderCreated",
-		func(g *CartGrain, m *messages.OrderCreated) error {
-			if m == nil {
-				return fmt.Errorf("OrderCreated: nil payload")
-			}
-			if m.OrderId == "" {
-				return fmt.Errorf("OrderCreated: missing orderId")
-			}
 
-			g.OrderReference = m.OrderId
-			g.PaymentStatus = m.Status
-			g.PaymentInProgress = false
-			return nil
-		},
-		// No WithTotals(): order completion does not modify pricing or taxes.
-	)
+func OrderCreated(g *CartGrain, m *messages.OrderCreated) error {
+	if m == nil {
+		return fmt.Errorf("OrderCreated: nil payload")
+	}
+	if m.OrderId == "" {
+		return fmt.Errorf("OrderCreated: missing orderId")
+	}
+
+	g.OrderReference = m.OrderId
+	g.PaymentStatus = m.Status
+	g.PaymentInProgress = false
+	return nil
 }