Rails on Redis - is all about high performance

redis_usage.rb

# app/controllers/posts_controller.rb
class PostsController < ApplicationController
  def index
    @posts.all_cached # Retrive only at once by every 5 minutes
    expires_in 5.minutes, :private => false, :public => true
  end
end

# app/models/post.rb
Class Post
  def self.all_cached
    Rails.cache.fetch(:posts) do
      self.all
    end
  end
end

# config/initializer/session_store.rb
ActionController::Base.session_store = Rack::Session::Redis

# config/environment.rb
require 'rack/cache'
require "redis-store"
Rails::Initializer.run do |config|
...
 config.middleware.use Rack::Cache,
    :verbose => true,
    :metastore   => "redis://localhost:6379/0",
    :entitystore => "redis://localhost:6379/1"

  
  if $0 == 'script/server'
    # Check for redis-store
    begin
      # check if redis-store is running; if it is, use that instead of the default memory cache
      Timeout.timeout(0.5) { TCPSocket.open("localhost", 6379) { } }
      config.cache_store = :redis_store
      $stderr.puts "\033[0;32mUsing redis-store on localhost:6379\033[0;34m"
    rescue StandardError
      $stderr.puts "\033[0;34mredis-store not running, you should run of \033[0;31m$ redis-server\033[0;29m"
      raise
    end

    # Check for sphinx
    begin
      # check if memcached is running; if it is, use that instead of the default memory cache
      Timeout.timeout(0.5) { TCPSocket.open("localhost", 9312) { } }
      $stderr.puts "\033[0;32mUsing sphinx on localhost:9312\033[0;29m"
    rescue StandardError
      $stderr.puts "\033[0;34msphinx not running, you should run of \033[0;31m$ rake ts:start\033[0;29m"
      raise
    end
  end