title: Does the latest version of Rails require my db migration files to have "down" (undo) commands for the db?
body: <p>Because it sure doesn't seem like it. When I generate a model and check out it's db migration file (I'm a bit of noob so forgive me for any ignorance), there is no "down" code which has been automatically generated. Is this because the newest rails versions have figured out how to handle this for me automatically?</p>