Rails: devise destory

$ rails destroy devise:install
      remove  config/initializers/devise.rb
      remove  config/locales/devise.en.yml

$ rails destroy devise User
      invoke  active_record
      remove    db/migrate/20150207125104_devise_create_users.rb
      remove    app/models/user.rb
      invoke    rspec
      remove      spec/models/user_spec.rb
       route  devise_for :users

$ rake db:migrate