Rails - May 2006 - expiring cache fragments using script/runner

I''ve just set up caching on my site and want to expire some of
fragments on
an hourly basis.

I was going to use cron and script/runner to do this.

For other fragments that I am expiring, I am using expire_fragment inside a
sweeper class, something like:

class QuestionSweeper < ActionController::Caching::Sweeper
  observe Question

  def after_validation_on_update(question)
    expire_page :controller => ''xml'', :action =>
''question'', :id =>
question.id
    expire_all_recently_added
  end
........
  def expire_all_recently_added
    expire_fragment :controller => ''landing'', :action =>
''last_added'', :part
=> ''list''
  end
.
What I am stumped on is that I want to use script/runner which works on
models, and expire_fragment which works in controllers.

Can someone provide an example of how they would expire the fragment and how
it would be called by script/runner?

Thanks,

Steve
http://www.smarkets.net
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