# File lib/ancestry/class_methods.rb, line 62
    def sort_by_ancestry(nodes)
      arranged = nodes.is_a?(Hash) ? nodes : arrange_nodes(nodes.sort_by{|n| n.ancestry || '0'})
      arranged.inject([]) do |sorted_nodes, pair|
        node, children = pair
        sorted_nodes << node
        sorted_nodes += sort_by_ancestry(children) unless children.blank?
        sorted_nodes
      end
    end