权限ID等常量应该在mvc架构的哪里合适？
在mvc经典架构之上，我的c层是逻辑控制，service层负责具体业务实现，model层只有service层有权利调用，service层只有c层有权，db handle，orm等与数据库交互的，只有model层有权使用。
现在原来的系统有许多permission id，都是用数字硬编码的。我想着用一个常量类或者配置来解决，但配置的开销太大，用枚举常量的话，这部分应该处于一个什么样的未知呢？真怕被过度设计了。
怎么样避免过度设计，同时让我的常量(likes)处于更恰当的未知。比较通用一点的？ 大家都怎么做的？
目前的想法是：
model层，内置一个permission provider class
吐槽一下segmentfault的标签bug。
回复内容：
在mvc经典架构之上，我的c层是逻辑控制，service层负责具体业务实现，model层只有service层有权利调用，service层只有c层有权，db handle，orm等与数据库交互的，只有model层有权使用。
现在原来的系统有许多permission id，都是用数字硬编码的。我想着用一个常量类或者配置来解决，但配置的开销太大，用枚举常量的话，这部分应该处于一个什么样的未知呢？真怕被过度设计了。
怎么样避免过度设计，同时让我的常量(likes)处于更恰当的未知。比较通用一点的？ 大家都怎么做的？
目前的想法是：
model层，内置一个permission provider class
吐槽一下segmentfault的标签bug。
既然层次划分那么清楚，哪层用到就放哪层呗。
另外放配置文件也可以的，为什么说配置文件开销大？
一般常量不都是放在config中的吗？用的时候就直接调用，这样的开销会很大吗
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