# File lib/ancestry/class_methods.rb, line 171 def build_ancestry_from_parent_ids! parent_id = nil, ancestry = nil unscoped_where do |scope| scope.where(:parent_id => parent_id).find_each do |node| node.without_ancestry_callbacks do node.update_attribute ancestry_column, ancestry end build_ancestry_from_parent_ids! node.id, if ancestry.nil? then "#{node.id}" else "#{ancestry}/#{node.id}" end end end end