class ActiveAdmin::FormBuilder

def cancel_link(url = {action: "index"}, html_options = {}, li_attrs = {})
  li_attrs[:class] ||= "cancel"
  li_content = template.link_to I18n.t('active_admin.cancel'), url, html_options
  template.content_tag(:li, li_content, li_attrs)
end

def has_many(assoc, options = {}, &block)
  HasManyBuilder.new(self, assoc, options).render(&block)
end