#89 Page Caching (revised)

Feb 02, 2012 | 9 minutes | Performance, Caching

Page caching is an efficient way to cache full content to be served by the front-end web server. Learn how to deal with pagination, expiration with sweepers, and user-specific content in this episode.

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          config/environments/development.rb
        
config.action_controller.perform_caching = true

          config/routes.rb
        
get 'products/page/:page', to: 'products#index'

          products_controller.rb
        
caches_page :index, :show
before_filter(only: [:index, :show]) { @page_caching = true }
cache_sweeper :product_sweeper

          app/sweepers/product_sweeper.rb
        
class ProductSweeper < ActionController::Caching::Sweeper
  observe Product
  
  def sweep(product)
    expire_page products_path
    expire_page product_path(product)
    expire_page "/"
    FileUtils.rm_rf "#{page_cache_directory}/products/page"
  end
  alias_method :after_create, :sweep
  alias_method :after_update, :sweep
  alias_method :after_destroy, :sweep
end

          layouts/application.html.erb
        
<%= csrf_meta_tag unless @page_caching %>
...
<% unless @page_caching %>
  <% flash.each do |name, msg| %>
    <%= content_tag :div, msg, id: "flash_#{name}" %>
  <% end %>
<% end %>