voucher change

pkg/cart/cart-mutation-helper.go

@@ -45,6 +45,9 @@ func NewCartMultationRegistry() actor.MutationRegistry {
 		actor.NewMutation(UpsertSubscriptionDetails, func() *messages.UpsertSubscriptionDetails {
 			return &messages.UpsertSubscriptionDetails{}
 		}),
+		actor.NewMutation(PreConditionFailed, func() *messages.PreConditionFailed {
+			return &messages.PreConditionFailed{}
+		}),
 	)
 	return reg
 

pkg/cart/mutation_precondition.go

@@ -0,0 +1,7 @@
+package cart
+
+import messages "git.tornberg.me/go-cart-actor/pkg/messages"
+
+func PreConditionFailed(g *CartGrain, m *messages.PreConditionFailed) error {
+	return nil
+}