Rolling back a failed Rails migration

Question

How do you roll back a failed rails migration? I would expect that rake db:rollback would undo the failed migration, but no, it rolls back the previous migratio

Answer 1

To go to a specified version just use:

rake db:migrate VERSION=(the version you want to go to)

But if a migration fails part way, you'll have to clean it up first. One way would be:

• edit the down method of the migration to just undo the part of the up that worked
• migrate back to the prior state (where you started)
• fix the migration (including undoing your changes to the down)
• try again