partial_to_virtual_path

# File actionview/lib/action_view/render_parser.rb, line 176
        def partial_to_virtual_path(render_type, partial_path)
          if render_type == :partial || render_type == :layout
            partial_path.gsub(%{(/|^)([^/]*)\z}, '\1_\2')
          else
            partial_path
          end
        end