Activeadmin DSL change issue

form do |f|
  f.inputs do
    f.has_many :items, :sortable => :position do |item|
      item.inputs :class => "item_wrapper" do
        item.inputs do
          "<p>some static html</p>".html_safe
        end
        item.input :title, :input_html => {:class => 'item_title'}
        item.input :blurb, :input_html => { :rows => 3, :class => 'item_blurb'}
        item.inputs do
          "<p>More static html</p>".html_safe
        end
      end
    end
  end
  f.actions
end