Is there a quick rake db:rollback command for all of the migrations?
To rollback all migrations the best solution is the one @Claudio Floreani proposed:
rake db:migrate VERSION=0
This will rollback every migration. You can read why this is the best approach in his answer. Then, run all migrations again with
rake db:migrate
rake db:migrate:reset #runs db:drop db:create db:migrate
This method drops the database and runs the migrations again.
rake db:reset
This method will drop the database and load the data from the last schema.
You can see more information in this post: Difference between rake db:migrate db:reset and db:schema:load
Thanks to @Claudio Floreani and all the users who commented to improve the answer.