Treequel adding to many extensions

gistfile1.rb

class OrganizationalUnitsController < ApplicationController

  def show
    @organizational_unit = @directory.search( params[:id], :base )
  end

end

require 'treequel/model'
require 'treequel/model/objectclass'

module OrganizationalUnit
  extend Treequel::Model::ObjectClass
  extend Global::Class

  model_class Treequel::Model
  model_bases "o=company,c=cl"
  model_objectclasses :organizationalUnit

  
  # id is the dn off the entry we are looking
  def self.find(id)
      # (assuming id="uid=foobar,o=company,c=cl")
      attrs, base = id.split(/,/, 2)
      # => ['uid=foobar', 'o=company,c=cl']

      # 'uid=foobar' is equivalent to { :uid => 'foobar' }
      # and the #from method can reset the base for one search (without resetting it 
      # for the whole model):
      filter(attrs).from(base).first
  end

end

show.html.erb

<div style="float: left;">
		<p>
			<%= @organizational_unit.description_text %><br/>
			<%= @organizational_unit.extensions.size %>
		</p>
</div>