def arrange options = {}
      if (order = options.delete(:order))
        arrange_nodes self.ancestry_base_class.order(order).where(options)
      else
        arrange_nodes self.ancestry_base_class.where(options)
      end
    end
def arrange options = {}
      if (order = options.delete(:order))
        arrange_nodes self.ancestry_base_class.order(order).where(options)
      else
        arrange_nodes self.ancestry_base_class.where(options)
      end
    end
Get all nodes and sorting them into an empty hash