各位， 作为第一批 rabel 的付费用户，感谢@daqing的开源，其他人也能用这个 forum，也让我慢慢熟悉不懂的 rails。 现在碰到一个问题，rabel 的 layout 是使用 slim 的，我试了几个下拉菜单的方法，都不见有效果，比如这个，我直接在某个 view 里面使用，也不能显示下拉菜单。

.topbar-wrapper{:style => "z-index: 5;"}
  .topbar{"data-dropdown" => "dropdown"}
    .topbar-inner
      .container
        %h3
          = link_to 'Project', root_path
        %ul.nav
          %li
            = link_to 'Home', '#', {:class => 'active'}
          %li
            = link_to 'Link', '#'
          %li
            = link_to 'Link', '#'
          %li
            = link_to 'Link', '#'
          %li
            = link_to 'Apps', applications_path
          %ul{:class => "nav secondary-nav"}
            %li.dropdown
              = link_to 'Dropdown', '#', {:class => 'dropdown-toggle'}
              %ul.dropdown-menu
                %li
                  = link_to 'Secondary Link', '#'
                %li
                  = link_to 'Something else here', '#'
                %li.divider
                %li
                  = link_to 'Another link', '#'
        %form.pull-left{:action => ""}
          %input{:placeholder => "Search"}
        %ul{:class => "nav secondary-nav"}
          %li.dropdown
            = link_to 'Dropdown', '#', {:class => 'dropdown-toggle'}
            %ul.dropdown-menu
              %li
                = link_to 'Secondary link', '#'
              %li
                = link_to 'Something else here', '#'
              %li.divider
              %li
                = link_to 'Another link', '#'

以下是我的 layout 里面的菜单，我想把 ul.dropdown 以下的内容写成下拉菜单，不太明白产生问题的原因，请指教。

body#rabel
    .navbar.navbar-inverse.navbar-static-top
      .navbar-inner
        .container
          a.btn.btn-navbar.collapsed(
           data-toggle='collapse'
           data-target='.nav-collapse')
           span.icon-bar
           span.icon-bar
           span.icon-bar
          = link_to Siteconf.site_name, root_path, class: :brand
          .nav-collapse.collapse
            form.navbar-search.pull-right
              input#q.search-query type='text' name='q' maxlength=40 data-domain=Settings.canonical_host placeholder=t(:search)
            ul.nav.pull-left
              = nav_item(t('site.a'), a_path)
              = nav_item(t('site.b'), b_path)
              = nav_item(t('site.c'), c_path)
              ul.dropdown-menu
              - if user_signed_in?
                li= nav_item current_user.nickname, member_path(url_encode(current_user.nickname))
                li= nav_item t('site.d'), d_path
                - if current_user.e?
                  li= nav_item t('site.e'),e_path
                li= link_to t('site.f'), f_path, :method => :delete
              - else
                = nav_item(t('site.g'), g_path)
                = nav_item(t('site.h'), h_path)

PS：在改的网站是 http://roboticsfaq.com