withassociates/slices

<div class="navigation">
  <ul id="breadcrumbs">
    <li>
      <%= link_to 'Sitemap', admin_site_maps_path %>
    </li>

    <% @page.breadcrumbs.reverse_each do |page| %>
      <li class="<%= 'current' if page == @page.source %>">
        <% if page.set_page? %>
          <%= link_to page.name, admin_page_entries_path(page) %>
        <% else %>
          <%= link_to page.name, admin_page_path(page) %>
        <% end %>
      </li>
    <% end %>

    <li>
      <select id="children">
        <option selected disabled>Children of this page…</option>
        <% @page.children.each do |page| %>
          <% if page.set_page? %>
            <option value="<%= admin_page_entries_path page %>"><%= page.name %></option>
          <% else %>
            <option value="<%= admin_page_path page %>"><%= page.name %></option>
          <% end %>
        <% end %>
        <option disabled role="separator">---</option>
        <option value="<%= new_admin_page_path parent_id: @page.bson_id %>">Add Child…</option>
      </select>
    </li>
  </ul>
</div>