如何在Rails上查找数据库迁移日志?

I want to rollback my database to a certain version on Rails using the STEP parameter, but I don't know how many steps should i rollback so I want to check the migration log. Can I do that on Rails (v3.2.13)?

我想使用STEP参数将数据库回滚到Rails上的某个版本，但是我不知道应该回滚多少步，因此我想检查迁移日志。我可以在Rails上做吗(v3.2.13)?

2 个解决方案

#1

Try the following:

试试以下:

rake db:migrate:status

It will give you the following output, up meaning migration has been run, down hasn't been run yet:

它会给你下面的输出，也就是说迁移已经运行了，下面还没有运行:

Status   Migration ID    Migration Name
--------------------------------------------------
   up     20120328154345  Devise create users
   up     20120331182021  Create websites

#2

You can try to get migration versions by

您可以尝试获得迁移版本

 >  ActiveRecord::Migrator.current_version
   (38.7ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" 
 => 20130403113845 
1.9.3-p392 :002 > ActiveRecord::Migrator.get_all_versions
   (0.8ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" 
 => [20130327085819, 20130327085820, 20130327085821, 20130327085822, 20130327085823, 20130327085824, 20130327085825, 20130327085826, 20130327085827, 20130327085828, 20130327085829, 20130327085830,........

or you can use the time stamp of the specific migration upto which you want to rollback and use

或者您可以使用要回滚和使用的特定迁移的时间戳

rake db:migrate:down VERSION= timestamp

rake db:迁移:VERSION =时间戳

#1