default_layout

# File actionpack/lib/action_controller/layout.rb, line 180
      def default_layout(format) #:nodoc:
        layout = read_inheritable_attribute("layout")
        return layout unless read_inheritable_attribute("auto_layout")
        @default_layout ||= {}
        @default_layout[format] ||= default_layout_with_format(format, layout)
        @default_layout[format]
      end