Chris@909: class AddProjectsLftAndRgt < ActiveRecord::Migration Chris@909: def self.up Chris@909: add_column :projects, :lft, :integer Chris@909: add_column :projects, :rgt, :integer Chris@909: end Chris@909: Chris@909: def self.down Chris@909: remove_column :projects, :lft Chris@909: remove_column :projects, :rgt Chris@909: end Chris@909: end