# File lib/nested_form/builder_mixin.rb, line 90
    def fields_for_nested_model(name, object, options, block)
      classes = 'fields'
      classes << ' marked_for_destruction' if object.respond_to?(:marked_for_destruction?) && object.marked_for_destruction?

      perform_wrap   = options.fetch(:nested_wrapper, true)
      perform_wrap &&= options[:wrapper] != false # wrap even if nil

      if perform_wrap
        @template.content_tag(:div, super, :class => classes)
      else
        super
      end
    end