pagination page cache sweeper

article_sweeper.rb

class ArticleSweeper < ActionController::Caching::Sweeper
  observe Article # This sweeper is going to keep an eye on the article model
 
  # If our sweeper detects that a article was created call this
  def after_create(article)
    expire_cache_for(article)
  end
 
  # If our sweeper detects that a article was updated call this
  def after_update(article)
    expire_cache_for(article)
    expire_cache_for_single(article)
  end
 
  # If our sweeper detects that a article was deleted call this
  def after_destroy(article)
    expire_cache_for(article)
    expire_cache_for_single(article)
  end
 
  private
  def expire_cache_for_single(article)
    expire_page(:controller => 'articles', :action => 'show')
  end
  
  def expire_cache_for(article)
    # Expire the index page now that we added or modified an article
    expire_page(:controller => 'articles', :action => 'index')
    # expire the index.html which is created by root_path
    expire_page '/index.html'
    
    # manually remove pages(1.html, 2.html, etc)
    if File.exist?("#{Rails.root}/public/articles/page") # check to make sure directory exists
      Dir.foreach("#{Rails.root}/public/articles/page") do |entry|
        unless entry == "." || entry == ".." || entry == ".gitignore" # ignore dot files
          File.delete("#{Rails.root}/public/articles/page/#{entry}")
        end
      end
    end
  end
end