是否有一个 rake 任务可以将您的架构版本前进或后退一倍？
当迁移版本号在创建迁移时简单地增加时，这很容易做到：
rake migrate VERSION=097
rake migrate VERSION=098
rake migrate VERSION=099
rake migrate VERSION=100
...但我们现在的迁移号类似于 YYYYMMDDtimeofday。 这并不是一件坏事 - 它可以将迁移版本冲突保持在最低限度 - 但当我有 50 个迁移并且想要一次逐步执行它们时，这是一件麻烦的事情：
rake migrate VERSION=20090129215142
rake migrate VERSION=20090129219783
...等等。 我必须在我面前打开所有迁移的列表，输入版本号以前进一。 有没有更简单的语法，例如：
rake migrate VERSION=NEXT
或
rake migrate VERSION=PREV
？
Back when migration version numbers were simply incremented as you created migrations, it was easy enough to do:
rake migrate VERSION=097
rake migrate VERSION=098
rake migrate VERSION=099
rake migrate VERSION=100
...but we now have migration numbers that are something like YYYYMMDDtimeofday. Not that this is a bad thing - it keeps the migration version collisions to a minimum - but when I have 50 migrations and want to step through them one-at-a-time, it is a hassle:
rake migrate VERSION=20090129215142
rake migrate VERSION=20090129219783
...etc. I have to have a list of all the migrations open in front of me, typing out the version numbers to advance by one. Is there anything that would have an easier syntax, like:
rake migrate VERSION=NEXT
or
rake migrate VERSION=PREV
?
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您也可以回滚到非常旧的版本。
You can also rollback to a very old version too.
您可以使用
rake db:rollback回滚到之前的迁移。 不过，看起来您不能只通过一次迁移就可以继续前进。You rollback to the previous migration with
rake db:rollback. It doesn't look like you can go forward by only one migration though.