sweeper.rb

class PersonSweeper < ActionController::Caching::Sweeper
  observe Person

  def after_create(person)
    expire_cache_for person
  end

  def after_update(person)
    expire_cache_for person
  end

  def after_destroy(person)
    expire_cache_for person
  end

  private
    def expire_cache_for(person)
      expire_page :action => :index
    end
end