下单时候自动选择优惠金额最大的优惠券

zsw-bxg/src/main/java/co/yixiang/modules/order/service/impl/YxStoreOrderServiceImpl.java

@@ -269,6 +269,11 @@ public class YxStoreOrderServiceImpl extends BaseServiceImpl<StoreOrderMapper, Y
 
         StoreCouponUserVo storeCouponUser = null;
         if (storeCouponUsers != null && !storeCouponUsers.isEmpty()) {
+            //如果有多张优惠券，就进行比较,按优惠金额排序
+            if (storeCouponUsers.size()>1){
+                Collections.sort(storeCouponUsers, (couponUserVo1, couponUserVo2) -> couponUserVo1.getCouponPrice()>couponUserVo2.getCouponPrice()? -1:(couponUserVo1.getCouponPrice()==couponUserVo2.getCouponPrice()? 0:1));
+            }
+            //选出优惠金额最大的券
             storeCouponUser = storeCouponUsers.get(0);
         }