优惠券处理

vehicle-server/src/main/resources/mapper/UserCouponMapper.xml

@@ -80,7 +80,7 @@
         from `user_coupon` ucn
         <where>
             ucn.used = 0
-            and cn.merchant_id in
+            and ucn.merchant_id in
             <foreach collection="param.merchantIds" item="id" open="(" close=")" separator=",">
                 #{id}
             </foreach>