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I just want to roll one version back, But I don't know the current VERSION, Is there a command to check it?

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  • sorry dude, I was too excited to try each solution out, and forget came back to accept answer Commented Dec 10, 2010 at 15:35
  • no problem ^^ I was just wondering if I had to add anything to my answer Commented Dec 10, 2010 at 17:15
  • how to add @yozloy in the front of your comment, it's a quote function or what? Commented Dec 11, 2010 at 4:45

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First, it's worth taking the time to read the Rails Guide regarding migrations. Then regarding your specific question:

... to roll back one version:

rake db:rollback STEP=1

... to see the current version:

rake db:version
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VERSION essentially is the name of a specific migration and not a point in time. You need to roll back multiple such “versions” to get back in time. These versions have the same names as the file names in db/migrate (without extension). This can be used to roll back a specific migration without undoing migrations done later.

Use the STEP parameter to go back in time a specified amount of migration steps.

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Migrations are timestamped. It is safe to assume that the latest timestamp is the current migration in most instances.

http://guides.rubyonrails.org/migrations.html#rolling-back

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Great link - always needed rake db:migrate:redo STEP=3

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