Rails - Jun 2009 - How to display categorized pages in the most effective way?

I am looking for the most effective way to display categorized pages.

Page model:
  acts_as_tree
  belongs_to :theme

(has attribute "title")

Theme model:
  has_many :pages

(has attribute "name")

I''d like to display all the children (titles) of the current page but
grouping these pages in themes they belong to.

I imagine that code "extracts" unique themes from @page.children and
then iterates through these themes and displays just pages (titles) that
are children of the current page and belong to proper themes.

This should print the following data:

Theme_X
 - page_b
 - page_f
 - page_m
Theme_Y
 - page_c
 - page_g
 - page_l
Theme_ ...

where page_? is the child of the current page.

How to do it effectively? Any help appreciated.
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Emmek on Rails wrote:
> 
> I imagine that code "extracts" unique themes from @page.children
and
> then iterates through these themes and displays just pages (titles) that
> are children of the current page and belong to proper themes.
> 
You might want to look at named_scopes... this sounds like a candidate 
for a something like page.theme_ordered_children, rather than just 
page.children.

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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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