讨论数量: 15
![](https://cdn.learnku.com/uploads/avatars/12861_1600839581.jpg!/both/100x100)
对于优惠卷代码输入错误的修改建议
![](https://cdn.learnku.com/uploads/images/201801/03/1/8uNnIba2M2.jpg)
选择优惠券下单,出现系统错误?
![](https://cdn.learnku.com/uploads/avatars/27584_1531953641.jpg!/both/100x100)
校验优惠码 checkAvailable (User $user, $orderAmount = null) 方法内是否存在小 bug?
![](https://cdn.learnku.com/uploads/avatars/26138_1528762299.jpeg!/both/100x100)
这个文件怎么在教程没有看见创建的?
![](https://cdn.learnku.com/uploads/avatars/28686_1576123036.jpg!/both/100x100)
模型中 $this->where ('id', $this->id) 这个过滤条件是否有点多余
![](https://cdn.learnku.com/uploads/avatars/28562_1533971919.png!/both/100x100)
老师,这里不会出现浮点数精度问题吗
![](https://cdn.learnku.com/uploads/avatars/27464_1531796396.jpeg!/both/100x100)
使用优惠券下单报错?
![](https://cdn.learnku.com/uploads/avatars/36926_1587430575.png!/both/100x100)
关于数据库中优惠券使用数量和库存加减的问题
![](https://cdn.learnku.com/uploads/avatars/5402_1471212560.jpeg!/both/100x100)
if ($coupon->changeUsed () <= 0) 这个判断有必要吗?
![](https://cdn.learnku.com/uploads/avatars/20047_1519798224.jpg!/both/100x100)
increment 和 update 某个字段并 +1 这种操作有何区别
![](https://cdn.learnku.com/uploads/avatars/26469_1529485878.jpg!/both/100x100)
$totalAmount = $coupon->getAdjustedPrice ($totalAmount); 调用?
![](https://cdn.learnku.com/uploads/images/201801/03/1/AsLlHzUmyq.jpg)
checkAvailable () 为何放在 model 而不是 service 里面?
![](https://cdn.learnku.com/uploads/avatars/28562_1533971919.png!/both/100x100)
老师,这里判断是不是重复了
![](https://cdn.learnku.com/uploads/avatars/28274_1539836887.jpg!/both/100x100)
优惠卷下单都正常,但是输入一个不存在的优惠码或者开始时间还没到的优惠码点击检查的话就报系统错误!!!
![](https://cdn.learnku.com/uploads/avatars/26138_1528762299.jpeg!/both/100x100)
$request->input ('coupon_code') 从哪里接收到来的?