extract_namespace

# File actionpack/lib/action_controller/polymorphic_routes.rb, line 187
      def extract_namespace(record_or_hash_or_array)
        return "" unless record_or_hash_or_array.is_a?(Array)

        namespace_keys = []
        while (key = record_or_hash_or_array.first) && key.is_a?(String) || key.is_a?(Symbol)
          namespace_keys << record_or_hash_or_array.shift
        end

        namespace_keys.map {|k| "#{k}_"}.join
      end