Roll back all rails migrations or drop tables and modify migrations (start from scratch)

ruby-on-rails ruby ruby-on-rails-3 migration models

First, rollback your migrations to version 0.

rake db:migrate VERSION=0

Then you manually delete your migrations and models, leaving the controllers and views intact.

ruby-on-rails ruby ruby-on-rails-3 migration models

Just delete all files in app/models and db/migrate then run:

rake db:reset

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