Redmine

            find(:all, :conditions => ["#{quoted_parent_column_name} = ? #{scope.call(node)}", node], :order => "#{quoted_left_column_name}, #{quoted_right_column_name}, #{acts_as_nested_set_options[:order]}").each{|n| set_left_and_rights.call(n) }

            # set right

            node[right_column_name] = indices[scope.call(node)] += 1    

          end

          # Find root node(s)