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add_column_sql 的应用场景是啥
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新手问题
add_column_sql 的应用场景是啥
hastings
·
January 30, 2015
· 1453 hits
在查看 rails 的 api 时看到了 add_column_sql,它跟 add_column 的区别在哪里,哪种情况下它比 add_column 好使?
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@hastings
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