Rails Page Caching

Rails Page Caching ,[object Object],[object Object],[object Object]

Why Cache? ,[object Object],[object Object]

But, How Do We Do It? ,[object Object],[object Object],[object Object],config.action_controller.perform_caching = true caches_page :index, :show, :feed # Move the cached files into their own directory config.action_controller.page_cache_directory = RAILS_ROOT + "/public/cache/"

What About New Content? ,[object Object],[object Object],[object Object],[object Object],config.load_paths += %W( #{RAILS_ROOT}/app/sweepers )

Quick and Dirty Sweeper class SiteSweeper < ActionController::Caching::Sweeper observe Post, Comment def after_save (record) self.class::sweep end def after_destroy (record) self.class::sweep end def self.sweep cache_dir = ActionController :: Base .page_cache_directory unless cache_dir == RAILS_ROOT + "/public" FileUtils .rm_r( Dir .glob(cache_dir + "/*" )) rescue Errno ::ENOENT RAILS_DEFAULT_LOGGER .info( "Cache directory fully swept." ) end end end

We Can Do Better ,[object Object],class PostSweeper < ActionController::Caching::Sweeper observe Post def after_save (post) expire_pages(post) end def after_destroy (post) expire_pages(post) end def expire_pages (post) expire_page(blog_path(:page => nil )) # expire blog index (/blog/list) expire_page(blog_path(post)) # expire detail page (/blog/12) # if we need to remove an entire directory in the cache cache_dir = ActionController :: Base .page_cache_directory FileUtils .rm_r( Dir .glob(cache_dir + "/blog/list/*" )) rescue Errno ::ENOENT # expire list RAILS_DEFAULT_LOGGER .info( "Cache directory for blog successfully swept." ) end end

Calling the Sweeper ,[object Object],[object Object],class Manage::PostsController < ApplicationController cache_sweeper :post_sweeper, :only => [:create, :update, :destroy] # other code... end

Tell the Server to Use Cache ,[object Object],# Rewrite index to check for static index RewriteRule ^/$ /cache/index.html [QSA] # Rewrite to check for cached pages RewriteRule ^([^.]+)$ /cache/$1.html [QSA]

What about pagination? ,[object Object],[object Object],map.blog_list 'blog/list/:page' , :controller => 'blog' , :action => 'index' , :requirements => { :page => / +/ }, :page => nil # This will add the following routes # blog_list_path => site.com/blog/list # blog_list_path(:page => 3) => site.com/blog/list/3

The End! ,[object Object],[object Object]

Rails Page Caching

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