本文介绍了运行一个迁移文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
是否有一种简单的方法来运行单个迁移?我不想迁移到某个版本，而只想运行一个特定的版本.
Is there an easy way to run a single migration? I don't want to migrate to a certain version I just want to run a specific one.
推荐答案
您可以直接在ruby文件中运行代码:
You can just run the code directly out of the ruby file:
rails console
>> require "db/migrate/20090408054532_add_foos.rb"
>> AddFoos.up
注意:较新版本的rails可能需要AddFoos.new.up而不是AddFoos.up.
Note: newer versions of rails may require AddFoos.new.up rather than AddFoos.up.
另一种方法(不带IRB)依赖于require需要返回一个类名数组的事实:
An alternative way (without IRB) which relies on the fact that require returns an array of class names:
script/runner 'require("db/migrate/20090408054532_add_foos.rb").first.constantize.up'
请注意，如果执行此操作，它可能不会更新schema_migrations表，但是无论如何，这似乎就是您想要的.
Note that if you do this, it probably won't update the schema_migrations table, but it seems like that's what you want anyway.
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