pick_layout

# File actionpack/lib/action_controller/layout.rb, line 244
      def pick_layout(options)
        if options.has_key?(:layout)
          case layout = options.delete(:layout)
          when FalseClass
            nil
          when NilClass, TrueClass
            active_layout if action_has_layout? && !@template.__send__(:_exempt_from_layout?, default_template_name)
          else
            active_layout(layout)
          end
        else
          active_layout if action_has_layout? && candidate_for_layout?(options)
        end
      end