class AddPermalinkToPosts < ActiveRecord::Migration def self.up remove_column :posts, :slug remove_column :post_versions, :slug add_column :posts, :permalink, :string add_column :post_versions, :permalink, :string end def self.down remove_column :posts, :permalink remove_column :post_versions, :permalink add_column :posts, :slug, :string add_column :post_versions, :slug, :string end end