extract_selected_and_disabled

# File actionpack/lib/action_view/helpers/form_options_helper.rb, line 530
        def extract_selected_and_disabled(selected)
          if selected.is_a?(Proc)
            [ selected, nil ]
          else
            selected = Array.wrap(selected)
            options = selected.extract_options!.symbolize_keys
            [ options.include?(:selected) ? options[:selected] : selected, options[:disabled] ]
          end
        end