promotion add products

go/gopath/src/fohow.com/apps/helpers/promotion_helper.go

@@ -87,7 +87,7 @@ func SetOrderPromotion(orderId string, wxUid int64) {
 
 		if item.Prod4 > 0 {
 			nums5 = int64(0)
-			detail4 := order_model.GetDetailsByOrderIdAndPid(orderId, item.Prod3)
+			detail4 := order_model.GetDetailsByOrderIdAndPid(orderId, item.Prod4)
 			if detail4 != nil && item.Prod4 > 0 && item.Nums4 > 0 {
 				nums5 = int64(detail4.Count / item.Nums4)
 			}