# File lib/aws/simple_db/item_collection.rb, line 426
      def order(attribute, order = nil)
        sort = coerce_attribute(attribute)
        sort += " DESC" if order.to_s =~ /^desc(ending)?$/
        sort += " ASC" if order.to_s =~ /^asc(ending)?$/
        collection_with(:sort_instructions => sort,
                        :not_null_attribute => attribute.to_s)
      end