Rails database migrations cheat-sheet
Get status of migrations
rake db:migrate:status
Revert all migrations to a specific version
rake db:migrate VERSION=20100905201547
Revert specific migration
rake db:migrate:down VERSION=20100905201547
or in multi database setup:
rake db:migrate:down:primary VERSION=20100905201547
Revert latest n migrations
rake db:rollback STEP={n}
Run a specific migration
rake db:migrate:up VERSION=20100905201547
or in multi database setup:
rake db:migrate:up:primary VERSION=20100905201547