Using sanitize within a Rails controller

Question

I'm trying to call sanitize within a controller. Here's what I tried:

class FooController < ApplicationController
  include ActionView::Helpers::SanitizeHelper
  # ...
end

However, I'm getting this error:

undefined method `white_list_sanitizer' for FooController:Class

I searched around and people recommended switching the include line to include ActionView::Helpers, but that results in this error:

undefined method `url_for' for nil:NilClass

What's the correct way to call sanitize? I'm using Rails 2.3.5.