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guoyoujin/关于rails rollback migration的使用

Last active April 17, 2018 03:21
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关于rails rollback migration的使用
切记在rails 使用 migration，rollback的时候需要注意的点
1.删除表之后，执行rollback是无法回滚的
2.删除字段之后，执行rollback是无法回滚的
3.修改字段部分属性之后，执行rollback是无法回滚的
总之删除动作和修改动作回滚比较复杂，乱用，为此付出血的代价
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