如何在Rails 3中删除迁移文件 [英] How to delete migration files in Rails 3

问题描述

我想删除/删除迁移文件。我将如何去做呢？我知道这里有类似的问题，但作为更新，有没有更好的方法比做脚本/销毁？

另外，我应该做一个 db：reset 或 db：drop 如果我删除/删除迁移？执行一个 rake db：migrate VERSION = XXX 在所有环境中，到我要删除的版本之前。


手动删除迁移文件。

如果有未决的迁移（即，我删除的迁移不是最后一个），我只是再次执行新的 rake db：migrate 。 $ b

如果您的应用程序已经在生产或分期阶段，那么只需编写另一个销毁您的表或列的迁移就可以了。

迁移的另一个重要参考是： http://guides.rubyonrails.org/migrations。 HTML

I would like to remove/delete a migration file. How would I go about doing that? I know there are similar questions on here but as an update, is there a better way than doing script/destroy?

Also, should I do a db:reset or db:drop if I remove/delete a migration?

解决方案

I usually:

1. Perform a rake db:migrate VERSION=XXX on all environments, to the version before the one I want to delete.
2. Delete the migration file manually.
3. If there are pending migrations (i.e., the migration I removed was not the last one), I just perform a new rake db:migrate again.

If your application is already on production or staging, it's safer to just write another migration that destroys your table or columns.

Another great reference for migrations is: http://guides.rubyonrails.org/migrations.html

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