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

I agree that you should use PostgreSQL when possible. However, when you are stuck with MySQL, you can avoid most of these problems by trying your migration on your test database first:

rake db:migrate RAILS_ENV=test

You can revert to the previous state and try again with

rake db:schema:load RAILS_ENV=test