edit.haml

        - @item.article_pages.each do |article_page|
          = f.fields_for :article_pages, article_page do |ap|
            = render :partial => @item.article_pages, :locals => { :ap => ap, :template => false, :count => @item.article_pages.size }
        = f.fields_for :article_pages, @article_page do |ap|
          /= render :partial => '/article_pages/article_page', :object => @article_page, :locals => { :ap => ap, :template => true, :count => @item.article_pages }