kelby

Instrument Anything in Rails 3

With Rails 3.0 released a few weeks ago I've migrated a few apps and I'm constantly finding useful new improvements. One such improvement is the ability to log anything in the same way that Rails internally logs ActiveRecord and ActionView. By default Rails 3 logs look slightly spiffier than those produced by Rails 2.3: (notice the second line has been cleaned up)

Started GET "/" for 127.0.0.1 at Mon Sep 06 01:07:11 -0400 2010
  Processing by HomeController#index as HTML
  User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1
  CACHE (0.0ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1

Rendered layouts/_nav.html.erb (363.4ms)

	# Recursively diff two hashes, showing only the differing values.
	# By Henrik Nyh <http://henrik.nyh.se> 2009-07-14 under the MIT license.
	#
	# Example:
	#
	# a = {
	# "same" => "same",
	# "diff" => "a",
	# "only a" => "a",
	# "nest" => {

	# Author: Pieter Noordhuis
	# Description: Simple demo to showcase Redis PubSub with EventMachine
	# http://gist.github.com/348262

	# Incomplete evented Redis implementation specifically made for
	# the new PubSub features in Redis.

	# Modifications by Roger Jungemann

	require 'stringio'

	/*!
	* jQuery TextChange Plugin
	* http://www.zurb.com/playground/jquery-text-change-custom-event
	*
	* Copyright 2010, ZURB
	* Released under the MIT License
	*/
	(function ($) {

	$.event.special.textchange = {

	# blog post: http://blog.slashpoundbang.com/post/1455548868/memcachemodel-make-any-ruby-object-that-persists-in

	# No transactions or exceptions (yet).
	module MemcacheModel
	def self.included(base)
	base.class_eval do
	extend ActiveModel::Naming
	extend ActiveModel::Translation
	extend ActiveModel::Callbacks
	extend MemcacheModel::ClassMethods

	$ ab -c 1 -n 1000 http://127.0.0.1:3000/home
	This is ApacheBench, Version 2.3 <$Revision: 655654 $>
	Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
	Licensed to The Apache Software Foundation, http://www.apache.org/

	Benchmarking 127.0.0.1 (be patient)
	Completed 100 requests
	Completed 200 requests
	Completed 300 requests
	Completed 400 requests

	include $(GOROOT)/src/Make.inc

	GOFMT=gofmt -spaces=true -tabindent=false -tabwidth=4

	all:
	$(GC) jsontest.go
	$(LD) -o jsontest.out jsontest.$O

	format:
	$(GOFMT) -w jsontest.go

	after "deploy:symlink", "deploy:restart_workers"

	##
	# Rake helper task.
	# http://pastie.org/255489
	# http://geminstallthat.wordpress.com/2008/01/27/rake-tasks-through-capistrano/
	# http://ananelson.com/said/on/2007/12/30/remote-rake-tasks-with-capistrano/
	def run_remote_rake(rake_cmd)
	rake_args = ENV['RAKE_ARGS'].to_s.split(',')
	cmd = "cd #{fetch(:latest_release)} && #{fetch(:rake, "rake")} RAILS_ENV=#{fetch(:rails_env, "production")} #{rake_cmd}"

	require 'test_helper'
	require 'minitest/autorun'

	module Tenderlove
	class Spec < MiniTest::Spec
	include ActiveSupport::Testing::SetupAndTeardown
	include ActiveRecord::TestFixtures

	alias :method_name :__name__ if defined? :__name__
	self.fixture_path = File.join(Rails.root, 'test', 'fixtures')

	If you switch to kaminari,

	http://railscasts.com/episodes/254-pagination-with-kaminari

	...the lines added to application.js become redundant when you implement the pager like in this demo project:

	https://github.com/amatsuda/kaminari_example/tree/ajax

	in index.html: