template/source/partials/_siblings.erb
<div class="references">
<div class="header">
Sibling Articles under '<%= link_to(h(current_resource.directory.name), current_resource.parent) %>'
</div>
<ul>
<% current_resource.siblings.first(10).each do |res| %>
<% next if ! res.is_article? %>
<li><%= link_to(h(res.title), res) %></li>
<% end %>
<% if current_resource.siblings.size > 10 %>
<li><%= link_to("...", current_resource.parent) %></li>
<% end %>
</ul>
</div>