retrieve_variable

# File actionview/lib/action_view/renderer/partial_renderer.rb, line 535
      def retrieve_variable(path, as)
        variable = as || begin
          base = path[-1] == "/" ? "" : File.basename(path)
          raise_invalid_identifier(path) unless base =~ /\A_?(.*?)(?:\.\w+)*\z/
          $1.to_sym
        end
        if @collection
          variable_counter = :"#{variable}_counter"
          variable_iteration = :"#{variable}_iteration"
        end
        [variable, variable_counter, variable_iteration]
      end