保存优惠券

src/main/java/com/izouma/nineth/service/OrderService.java

@@ -164,6 +164,7 @@ public class OrderService {
             } else {
                 order.setTotalPrice(BigDecimal.ZERO);
             }
+            userCouponRepo.save(coupon);
         }
 
         if (collection.getSource() == CollectionSource.TRANSFER) {