OK, I was given the complete solution. I have the following pieces of
code:
controller:
@thematized_pages = @page.children.group_by(&:theme)
view:
<% @thematized_pages.each do |theme, pages| -%>
<h3><%= theme ? theme.name : 'Others' %></h3>
<ul>
<% pages.each do |page| %>
<li><%= link_to h(page.title),
h(page.parent.link_name+'/'+page.link_name) %></li>
<% end -%>
</ul>
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