rails revert migration
rake db:rollback
rails rollback multiple migrations
rake db:rollback STEP=n
# n = how many migrations you want to rollback
rails redo last migration
rake db:migrate:redo STEP=n
how to destroy a migration in rails
$ rails d migration SameMigrationNameAsUsedToGenerate
rails db:rollback
rake db:rollback VERSION=n
# n = the version you want to rollback to
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