Rails - Sep 2007 - how to override association proxy push()

i''m trying to override the push method on a habtm association, so i
can run code each time an element is added to the collection.  the
module.included method is never being called when habtm includes the
module... how can i do this?  or is there a better way to make a
''before_save'' listener for just the association?


class User < ActiveRecord::Base
  has_and_belongs_to_many :blacklisted_users,
    :class_name => ''User'',
    :join_table => :blacklisted_users,
    :foreign_key => :user_id,
    :association_foreign_key => :blacklisted_user_id,
    :insert_sql => ''insert into blacklisted_users (user_id,
blacklisted_user_id) values (#{id}, #{record.id})'',
    :extend => BlacklistedUserModule
end

module BlacklistedUserModule
  def self.included(base)
    puts "included"
    proxy_target.instance_eval do
      alias_method :old_push, :<<
      remove_method :<<
    end
  end

  def <<(*args)
    puts "new push"
    old_push(*args)
  end
end


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