I'm new to RoR, and I'm having trouble sorting a list of categories using acts_as_tree. Specifically, my list produces something like:

History > Modern > 20th Century
History > United States > 20th Century
Juvenile Fiction > Historical > United States > 20th Century
Juvenile Non-Fiction > History > United States > 20th Century
History > Modern > 21st Century
That's because I'm sorting by "name," rather than the full ancestry plus the name. What I would like to do is produce a list like this:


History > Modern > 20th Century
History > Modern > 21st Century
History > United States > 20th Century
Juvenile Fiction > Historical > United States > 20th Century
Juvenile Non-Fiction > History > United States > 20th Century
For the life of me, I can't figure out how to sort on the "long name" (ancestry + name). Everything I try seems to error out.

For background information, my model looks like this:

class Category < ActiveRecord::Base
acts_as_tree

def ancestors_name
if parent
parent.ancestors_name + parent.name + ' > '
else
""
end
end

def long_name
ancestors_name + name
end

end

The pertinent parts of my controller look like this:

class CategoriesController < ApplicationController

def list
@all_categories = Category.find(:all, :order => "name")
end
And the list.rhtml (view) looks like this:

<h1>Listing categories</h1>

<table>
<tr>
<th>Name</th>
</tr>

<% for category in @all_categories %>
<tr>
<td><%=h category.long_name %></td>
<td><%= link_to 'Edit', :action => 'edit', :id => category %></td>
<td><%= link_to 'Destroy', { :action => 'destroy', :id => category }, :confirm => 'Are you sure?', :method => :post %></td>
</tr>
<% end %>
</table>

<br />

<%= link_to 'New category', :action => 'new' %>
Of course, I would like to do a lot more with this than just the list, but if I can figure out how to do the list, I should be able to figure out the rest.

Any help would be most appreciated!