action_has_layout?

# File actionpack/lib/action_controller/layout.rb, line 291
      def action_has_layout?
        if conditions = self.class.layout_conditions
          case
            when only = conditions[:only]
              only.include?(action_name)
            when except = conditions[:except]
              !except.include?(action_name)
            else
              true
          end
        else
          true
        end
      end