Rails - Sep 2005 - Caching Sweepers and overloading

I use alot of inheritance on my models and such I have quite a number
of different pages that could get cached.

Because most everything is inheritted I don''t see the need to make:

class FooSweeper < ActionController::Caching::Sweeper
  expire_page(:section = foo.section, :id => foo.id)
  expire_page(:controller => "foo")
end

and

class BarSweeper < ActionController::Caching::Sweeper
  expire_page(:section = bar.section, :id => bar.id)
  expire_page(:controller => "bar")
end

When Bar < Foo and Foo < Base

Any ideas, is there a way I could do
BarSweeper < FooSweeper and somehow have it use Bar instead of Foo
where necessary?

Thanks,
Paul