Rails - Oct 2007 - Sweeper for few models

For example - i  have a sweeper for one model(in this case About).
class AboutSweeper < ActionController::Caching::Sweeper
  observe About
  def after_create(data)
    expire_about(data)
  end
  def after_save(data)
    expire_about(data)
  end
  def after_destroy(data)
    expire_about(data)
  end
  def expire_about(data)
    FileUtils.rm_rf File.expand_path("public/about/#{data.id}",
RAILS_ROOT)
    FileUtils.rm_rf File.expand_path("public/index.html", RAILS_ROOT)
  end
end

But I want to use one sweeper for several models. Can I write
something like
observer About, Book, Shop, City......
And expire this pages when i need? Or I need to create personal
sweeper for model?

Thanks


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