The Rich Get Richer: RAILS 3 PRESENTED BY OBIE FERNANDEZ Sunday, - - PowerPoint PPT Presentation

The Rich Get Richer: RAILS 3

OBIE FERNANDEZ

HASHROCKET

About 20k USD

About 45k USD

About 200k USD

“a few million dollars”

OMG RAILS 3 ROCKS SO MUCH MORE THAN RAILS 2!!!

OBIE FERNANDEZ

HASHROCKET

CAUTION: JUST A METAPHOR

How is Rails 3 Richer?

mainstream adoption maturity performance

• pen-source mindshare

The Rich Get Richer: RAILS 3

Presentation Overview

• History and Context
• What’s new
• ActiveRecord Performance
• Impact on Application Development

Ezra Zygmuntovich

merb [...] clocks in at 17,291 [loc]. Rails clocks in at 47,195. As you can see, it’s a tie.

Yehuda Katz

December 23, 2008

David Heinemeir Hansson

Tom Mornini

Tom Mornini

Q: How do you prevent bloating?

Ryan Sanchez's "Violet Beauregarde" ("Charlie and the Chocolate Factory")

A: Decoupling

A: Modularity

http://superpunch.blogspot.com/2009/10/lego-violet-beauregarde-and- more.html

require 'active_support/concern' require 'active_support/ordered_options' require 'active_support/core_ext/kernel/singleton_class' require 'active_support/core_ext/module/delegation' module ActiveSupport # Configurable provides a <tt>config</tt> method to store and retrieve # configuration options as an <tt>OrderedHash</tt>. module Configurable extend ActiveSupport::Concern class Configuration < ActiveSupport::InheritableOptions def compile_methods! self.class.compile_methods!(keys.reject {|key| respond_to?(key)}) end # compiles reader methods so we don't have to go through method_missing def self.compile_methods!(keys) keys.each do |key| class_eval <<-RUBY, __FILE__, __LINE__ + 1 def #{key}; _get(#{key.inspect}); end RUBY end end end ...

SA

Rails 3.0

August 29, 2010

The Rich Get Richer: RAILS 3

Notable Plugin Changes

• Formtastic 1.1 (made compatible)
• InheritedResources 1.1 (rewritten)
• Devise (significant upgrades)
• RSpec 2 (rewritten)
• EmailSpec 1.0 (rewritten)
• MetaSearch (instead of Searchlogic)

What’s new in Rails 3?

config/routes.rb

# This file is used by Rack-based servers to start the application. require ::File.expand_path('../config/environment', __FILE__) run Example::Application

config.ru

Rack::Cache ActionDispatch::Static Rack::Lock Rack::Runtime Rails::Rack::Logger ActionDispatch::ShowExceptions ActionDispatch::RemoteIp Rack::Sendfile ActionDispatch::Callbacks ActionDispatch::Cookies ActionDispatch::Flash ActionDispatch::ParamsParser Rack::MethodOverride ActionDispatch::Head Rack::ConditionalGet Rack::ETag ActionDispatch::BestStandardsSupport

Rails 3 Middleware “Stack”

gem "rails", "3.0.1" gem 'jquery-rails' gem "mysql" gem "haml", "3.0.18" gem "decent_exposure", "1.0.0.rc1" gem "devise", "1.1.3" gem "chronic", "0.2.3" gem "seed-fu", "1.2.3", :git => "git://github.com/supaspoida/seed-fu.git" gem "block_helpers", "0.3.3" gem "will_paginate", "3.0.pre2" gem "geokit", "1.5.0" group :test do gem "capybara", "0.3.9" gem 'database_cleaner', '0.5.0' gem 'launchy', '0.3.7' gem "rspec-rails", "2.0.1" gem "mocha", "0.9.9" gem "shoulda", "2.11.3" gem "selenium-webdriver" gem "timecop", "0.3.5" gem "watchr" gem "specjour", "0.3.1" gem "email_spec", "1.0.0" end

Gemfile

$ bundle Fetching source index for http://rubygems.org Using rake (0.8.7) Using abstract (1.0.0) Using activesupport (3.0.1) Using builder (2.1.2) Using i18n (0.4.2) Using activemodel (3.0.1) ... Your bundle is complete! It was installed into /Users/obie/.rvm/gems/ruby-1.9.2- p0@example-application

Arel

by Nick Kallen

“closure under composition”

User.find :conditions => { :name => "obie" } # in Rails 3 becomes User.where(:name => "obie")

>> u = User.where(first_name: "Pascale"); u.to_sql => "SELECT `users`.* FROM `users` WHERE (`users`.`first_name` = 'Pascale') >> u.where(age: 21).to_sql => "SELECT `users`.* FROM `users` WHERE (`users`.`first_name` = 'Pascale') AND (`users`.`age` = 21)" >> u.order(:name).limit(20).to_sql => "SELECT `users`.* FROM `users` WHERE (`users`.`first_name` = 'Pascale') ORDER BY name LIMIT 20"

class Invitation < ActiveRecord::Base default_scope order("created_at DESC") scope :accepted, where("accepted_at is NOT NULL") scope :pending, where(accepted_at: nil) ... end

Scopes

All of my open-sourced projects share two attributes. First, the source code is extremely stylized and meant to be /read/ more than /used/. They are literary arguments in code much more than a useful piece of infrastructure. If you read the source-code to Arel you will see a highly afgected "combinator" and "interpreter" style of coding.

Nick Kallen

“Holy shit, Rails 3 is slow!”

#5098

joins = [{:dim_locations=>[:dim_zip, {:dim_city=> {:dim_state=>:dim_country}}]}, :dim_ages, :dim_car_makes, :dim_educations, :dim_employments, :dim_foods, :dim_genders, :dim_get_aways, :dim_home_ownerships, :dim_incomes, :dim_marital_statuses, :dim_teams] conditions = ["(dim_zips.zip_code = ? OR dim_zips.zip_code IS NULL) AND (dim_cities.city = ? OR dim_cities.city IS NULL) AND (dim_states.state_code = ? OR dim_states.state_code IS NULL) AND (dim_states.state = ? OR dim_states.state IS NULL) AND (dim_countries.country_code = ? OR dim_countries.country_code IS NULL) AND (dim_countries.country = ? OR dim_countries.country IS NULL) AND (dim_ages.age = ? OR dim_ages.age IS NULL) AND (dim_car_makes.car_make IN (?) OR dim_car_makes.car_make IS NULL) AND (dim_educations.education = ? OR dim_educations.education IS NULL) AND (dim_employments.employment = ? OR dim_employments.employment IS NULL) AND (dim_foods.food IN (?) OR dim_foods.food IS NULL) AND (dim_genders.gender = ? OR dim_genders.gender IS NULL) AND (dim_get_aways.get_away IN (?) OR dim_get_aways.get_away IS NULL) AND (dim_home_ownerships.home_ownership = ? OR dim_home_ownerships.home_ownership IS NULL) AND (dim_incomes.income = ? OR dim_incomes.income IS NULL) AND (dim_marital_statuses.marital_status = ? OR dim_marital_statuses.marital_status IS NULL) AND (dim_teams.team IN (?) OR dim_teams.team IS NULL)", "98104", "Seattle", "WA", "Washington", "US", "United States of America", "18-34", ["Ashton Martin"], "Bachelors", "Full Time", ["Brazilian"], "Male", ["France"], "Rent", "Less than 30k", "Married", ["Arizona Cardinals", "Boston Bruins"]]

Benchmark.measure do Koupon.includes(joins).where(conditions).each end => 127.930000 0.390000 128.320000 (129.897278)

O(n^2) vs O(n)

routing

ActionController::Routing::Routes.draw do |map| map.resources :schedules do |schedules| schedules.resource :timeslots end map.resources :sponsors, :member => {:enable => :post, :disable => :post} map.resources :talks map.root :controller => 'home', :action => 'index' end

BizConf::Application::Routes.draw do resources :schedules do resource :timeslots end resources :sponsors do post :enable, :disable end resources :talks root :to => 'home#index' end

config/routes.rb Rails 2.x

match "/api/v1/post/:id", :to => redirect("/api/article/%{id}")

ActionController

AbstractController::Base ActionController::Metal ActionController::Base ApplicationController

ActionController::Metal

require 'mongo' class GridfsController < ActionController::Metal def serve gridfs_path = env["PATH_INFO"].gsub("/images/", "") begin fs = Mongo::GridFileSystem.new(Mongoid.database) gridfs_file = fs.open(gridfs_path, 'r') self.response_body = gridfs_file.read self.content_type = gridfs_file.content_type rescue self.status = :file_not_found self.content_type = 'text/plain' self.response_body = '' end end end

ActionMailer

$ rails Usage: rails COMMAND [ARGS] The most common rails commands are: generate Generate new code (short-cut alias: "g") console Start the Rails console (short-cut alias: "c") server Start the Rails server (short-cut alias: "s") dbconsole Start a console for database in config/database.yml (short-cut alias: "db") new Create a new Rails application. "rails new my_app" creates a new application called MyApp in "./my_app" In addition to those, there are: application Generate the Rails application code destroy Undo code generated with "generate" benchmarker See how fast a piece of code runs profiler Get profile information from a piece of code plugin Install a plugin runner Run a piece of code in the application environment

The Rich Get Richer: RAILS 3

Upgrade Path?

• Upgrade to 2.3.8 and Bundler
• Try http://github.com/rails/rails_upgrade
• Upgrade to 3.0.x
• rails console working
• rails console production working
• (unit) tests or specs green
• Cucumber (integration specs) green

Ryan Bigg

Rails 3 Documentation Project

MAKE YOUR DONATION AT

http://pledgie.com/ campaigns/14034

Q/A

THE RAILS

THE RAILS

Forewords by David Heinemeier Hansson, creator of Ruby on Rails and Yehuda Katz, Rails Core

OBIE FERNANDEZ

with DURRAN JORDAN, JON LARKOWSKI, XAVIER NORIA, and TIM POPE

• Learn what’s new in Rails 3
• Increase your productivity as a web application developer
• Realize the overall joy in programming with Rails
• Leverage Rails’ powerful capabilities for building REST-compliant APIs
• Drive implementation and protect long-term maintainability using RSpec
• Design and manipulate your domain layer using Active Record
• Understand and program complex program flows using Action Controller
• Master sophisticated URL routing concepts
• Use Ajax techniques via Rails 3 support for unobtrusive JavaScript
• Learn to extend Rails with popular gems and plugins, and how to

• Extend Rails with the best third-party plug-ins and write your own
• Integrate email services into your applications with Action Mailer
• Improve application responsiveness with background processing
• Create your own non-Active Record domain classes using Active Model
• Master Rails’ utility classes and extensions in Active Support

• biefernandez.com

HASHROCKET

Thank you

• bie@hashrocket.com

Obie Fernandez