优惠券处理

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

@@ -81,7 +81,7 @@
         <where>
             ucn.used = 0
             and cn.merchant_id in
-            <foreach collection="merchantIds" item="id" open="(" close=")" separator=",">
+            <foreach collection="param.merchantIds" item="id" open="(" close=")" separator=",">
                 #{id}
             </foreach>
             <if test="param.type != null">