2º encontro de Frevo on Rails

1. FREVO ON RAILS
GRUPO DE USUÁRIOS RUBY/RAILS DE PERNAMBUCO
RUBY ON RAILS 3
O que vem de novo por aí...
GUILHERME CARVALHO E LAILSON BANDEIRA

2. FREVO ON RAILS
“No, no another Rails upgrade!”

3. FREVO ON RAILS
Rails 2 + Merb
Anunciado em dezembro de 2008

4. FREVO ON RAILS
Versão 3.0.0.beta1
Versão 3.0.0.beta2
Versão 3.0.0.beta3
Versão 3.0.0.beta4
Funciona em Ruby 1.8.7 e 1.9.2
Versão 3.0.0.rc1
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5. FREVO ON RAILS
MAJOR UPGRADE

6. FREVO ON RAILS
Mudanças arquiteturais importantes

7. FREVO ON RAILS
RAILS

8. FREVO ON RAILS
ACTIVE
SUPPORT
ACTIVE ACTION
RECORD PACK
RAILTIES
ACTIVE ACTIVE
MODEL RESOURCE
ACTION
MAILER

9. FREVO ON RAILS
COMMAND INTERFACE

10. FREVO ON RAILS
rails nome_da_app

11. FREVO ON RAILS
rails new nome_da_app

12. FREVO ON RAILS
script/server

13. FREVO ON RAILS
rails server

14. FREVO ON RAILS
rails s

15. FREVO ON RAILS
script/generate controller nome_do_controlador

16. FREVO ON RAILS
rails generate controller nome_do_controlador

17. FREVO ON RAILS
rails g controller nome_do_controlador

18. FREVO ON RAILS
console runner
profiler
dbconsole
destroy
plugin benchmarker

19. FREVO ON RAILS
Gerenciamento de gems com o Bundler

20. FREVO ON RAILS
ROUTING

21. FREVO ON RAILS
Não se usa mais o map!

22. FREVO ON RAILS
ActionController::Routing::Routes.draw do |map|
map.resources :posts
end

23. FREVO ON RAILS
ActionController::Routing::Routes.draw do |map|
resources :posts
end

24. FREVO ON RAILS
Resources e singular resources não
mudaram

25. FREVO ON RAILS
Namespaces e scopes

26. FREVO ON RAILS
map.with_options(:namespace => “admin”) do |a|
a.resources :photos
end

27. FREVO ON RAILS
namespace “admin” do
resources :photos
end

28. FREVO ON RAILS
Scopes foram criados para auxiliar na
organização

29. FREVO ON RAILS
map.resources :photos,
:member => {:preview => :get }

30. FREVO ON RAILS
resources :photos do
get :preview, on: :member
end

31. FREVO ON RAILS
Sai o método connect, entra o match

32. FREVO ON RAILS
rake routes

33. FREVO ON RAILS
RESPONDERS

34. FREVO ON RAILS
class PostsController < ApplicationController
def index
@posts = Post.all
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @posts }
end
end
def show
@post = Post.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.xml { render :xml => @post }
end
end
...
end

35. FREVO ON RAILS
class PostsController < ApplicationController
respond_to :html, :xml, :json
def index
@posts = Post.all
respond_with(@posts)
end
def show
@post = Post.find(params[:id])
respond_with(@post)
end
...
end

36. FREVO ON RAILS
É possível também criar
outros responders

37. FREVO ON RAILS
Three reasons to love Responders
http://weblog.rubyonrails.org/2009/8/31/three-reasons-love-responder

38. FREVO ON RAILS
ACTION CONTROLLER

39. FREVO ON RAILS
Gargalo de performance:
roteamento + renderização

40. FREVO ON RAILS
Separação de responsabilidades:
Action Dispatch

41. FREVO ON RAILS
Hierarquia de controladores

42. FREVO ON RAILS
AbstractController::Base
ActionController::Metal
ActionController::Base

43. FREVO ON RAILS
ACTIVE RECORD
QUERY API

44. FREVO ON RAILS
Nova API de consulta
Active Relation

45. FREVO ON RAILS
@posts = Post.find(:all,
! :conditions => ['created_at > ?', date])

46. FREVO ON RAILS
@posts = Post.where(['created_at > ?', date])

47. FREVO ON RAILS
Lazy loading

48. FREVO ON RAILS
@posts = Post.where(['created_at > ?', date])
if only_published?
! @posts = @posts.where(:published => true)
end

49. FREVO ON RAILS
# @posts.all
@posts.each do |p|
! ...
end

50. FREVO ON RAILS
group
from joins
order where
having
includes
limit select
offset

51. FREVO ON RAILS
minimum
maximum
first
all
sum
last
count
average
calculate

52. FREVO ON RAILS
Active Record Query Interface 3
http://m.onkey.org/2010/1/22/active-record-query-interface

53. FREVO ON RAILS
Escopos também foram simplificados

54. FREVO ON RAILS
class Post < ActiveRecord::Base
named_scope :published, :conditions => {:published => true}
named_scope :unpublished, :conditions => {:published => false}
end

55. FREVO ON RAILS
class Post < ActiveRecord::Base
scope :published, where(:published => true)
scope :unpublished, where(:published => false)
end

56. FREVO ON RAILS
VALIDAÇÕES SEM
MODELOS

57. FREVO ON RAILS
Consequência da modularização
Active Model

58. FREVO ON RAILS
class Person
include ActiveModel::Validations
validates_presence_of :first_name, :last_name
attr_accessor :first_name, :last_name
end

59. FREVO ON RAILS
person = Person.new
person.valid? # false
person.errors # {:first_name=>["can't be bl...
p.first_name = 'John'
p.last_name = 'Travolta'
p.valid? # true

60. FREVO ON RAILS
Make Any Ruby Object Feel Like AR
http://yehudakatz.com/2010/01/10/activemodel-make-any-
ruby-object-feel-like-activerecord/

61. FREVO ON RAILS
VALIDADORES
CUSTOMIZADOS

62. FREVO ON RAILS
Agora é possível criar validadores
que podem ser reusados

63. FREVO ON RAILS
Mais um resultado do desacoplamento

64. FREVO ON RAILS
module ActiveModel
module Validations
class CepValidator < EachValidator
FORMATO_CEP = /d{5}-d{3}/
def initialize(options)
super(options)
end
def validate_each(record, attribute, value)
unless valid?(value)
record.errors[attribute] = 'não é válido'
end
end
def valid?(value)
FORMATO_CEP =~ value
end
end
end
end

65. FREVO ON RAILS
require "#{Rails.root}/lib/validadores/cep_validator"
class Person < ActiveRecord::Base
validates :cep, cep: true
end

66. FREVO ON RAILS
ACTION MAILER

67. FREVO ON RAILS
Sai TMail, entra Mail

68. FREVO ON RAILS
Uma nova casa para os mailers
./app/mailers/nome_do_mailer

69. FREVO ON RAILS
Criação de defaults para diminuir duplicação
de código

70. FREVO ON RAILS
class UserMailer < ActionMailer::Base
! def welcome(user)
! ! recipients user.email
! ! from “email@example.com”
! ! subject “Welcome to my site”
! ! body { :user => user }
! end
end

71. FREVO ON RAILS
class UserMailer < ActionMailer::Base
! default from: “email@example.com”
! def welcome(user)
! ! @user = user
! ! mail(to: user.email,
! ! ! subject: “Welcome to my site”)
! end
end

72. FREVO ON RAILS
Anexos muito mais fáceis

73. FREVO ON RAILS
class UserMailer < ActionMailer::Base
! default from: “email@example.com”
! def welcome(user)
! ! @user = user
! ! attachments[“hello.gif”] = File.read(‘...’)
! ! mail(to: user.email,
! ! ! subject: “Welcome to my site”)
! end
end

74. FREVO ON RAILS
class UserMailer < ActionMailer::Base
! default from: “email@example.com”
! def welcome(user)
! ! @user = user
! ! attachments.inline[“logo.png”] =
! ! ! File.read(...)
! ! mail(to: user.email,
! ! ! subject: “Welcome to my site”)
! end
end

75. FREVO ON RAILS

76. FREVO ON RAILS
DEMO TIME

77. FREVO ON RAILS
RECURSOS

78. FREVO ON RAILS
Rails Dispatch
http://railsdispatch.com/

79. FREVO ON RAILS
Rails Guides Edge
http://guides.rails.info/

80. FREVO ON RAILS
Engine Yard Blog
http://www.engineyard.com/blog

81. FREVO ON RAILS
Dive into Rails 3 Screencasts
http://rubyonrails.org/screencasts/rails3

82. FREVO ON RAILS
Railscasts
http://railscasts.com/

83. FREVO ON RAILS
Agile Web Development with Rails (4th ed.)
http://pragprog.com/titles/rails4/agile-web-development-with-rails

84. FREVO ON RAILS
The Rails 3 Way
http://my.safaribooksonline.com/9780132480345

85. FREVO ON RAILS
FREVO ON RAILS
GRUPO DE USUÁRIOS RUBY DE PERNAMBUCO