lib/generators/acts_as_commentable_upgrade_migration/templates/migration.rb
class ActsAsCommentableUpgradeMigration < ActiveRecord::Migration
def self.up
rename_column :comments, :comment, :body
add_column :comments, :subject, :string
add_column :comments, :parent_id, :integer
add_column :comments, :lft, :integer
add_column :comments, :rgt, :integer
add_column :comments, :updated_at, :datetime
add_index :comments, :commentable_id
end
def self.down
rename_column :comments, :body, :comment
remove_column :comments, :subject
remove_column :comments, :parent_id
remove_column :comments, :lft
remove_column :comments, :rgt
remove_column :comments, :updated_at
remove_index :comments, :commentable_id
end
end