O Rails 3 foi finalmente anunciado e nele uma série de mudanças arquiteturais foram feitas. A princípio, para que programa, as mudanças podem parecer simples, penas novos comandos ou novas API’s. Mas se olharmos nos detalhes internos do framework podemos ver que as mudanças impactam diretamente na forma de usar o framework.

1. Rails 3 Internals
Conhecendo detalhes do framework que fazem a diferença.
Anderson Leite
@anderson_leite
www.andersonleite.com.br
Tuesday, September 14, 2010

2. Rails 3 Internals
Rails 3
Architectural changes
Rails + Merb
Tuesday, September 14, 2010

3. Rails 3 Internals
Rails 3
Modularidade
Tuesday, September 14, 2010

4. Rails 3 Internals
ActiveRelation
ActiveModel
Railtie
Tuesday, September 14, 2010

5. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

6. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

7. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

8. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

9. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

10. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

11. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

12. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

13. Rails 3 Internals
Tuesday, September 14, 2010

14. Rails 3 Internals
Diego Carrion ??
Tuesday, September 14, 2010

15. Rails 3 Internals
Diego Carrion ??
Tuesday, September 14, 2010

16. Rails 3 Internals
Diego Carrion ??
Tuesday, September 14, 2010

17. Rails 3 Internals
Diego Carrion ??
Tuesday, September 14, 2010

18. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
Tuesday, September 14, 2010

19. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
# Rails 3
@models = Model.where(:value => true)
Tuesday, September 14, 2010

20. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
Tuesday, September 14, 2010

21. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Tuesday, September 14, 2010

22. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
Array
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Tuesday, September 14, 2010

23. Rails 3 Internals
ActiveRelation
# Rails 2
@models = Model.find(:all, :conditions => {:value => true} )
Array
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Relation
Tuesday, September 14, 2010

24. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Relation
Tuesday, September 14, 2010

25. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Relation
@models.each do |m|
#...
end
Tuesday, September 14, 2010

26. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true)
@models = @models.order(params[:order])
@models = Model.where(:value => true).order(params[:order])
Relation
@models.each do |m|
#...
end
Lazy
Tuesday, September 14, 2010

27. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true).order(params[:order]).all
Tuesday, September 14, 2010

28. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true).order(params[:order]).all
Nova API (where, limit, having)
Tuesday, September 14, 2010

29. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true).order(params[:order]).all
where
having
select
group
Nova API (where, limit, having) order
limit
offset
joins
includes
lock
readonly
from
Tuesday, September 14, 2010

30. Rails 3 Internals
ActiveRelation
# Rails 3
@models = Model.where(:value => true).order(params[:order]).all
where
having
select
group
Nova API (where, limit, having) order
limit
Relation offset
joins
Encadeamento includes
lock
readonly
from
Tuesday, September 14, 2010

31. Rails 3 Internals
ActiveRelation
1) internamente
2) minha app?
Tuesday, September 14, 2010

32. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

33. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

34. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

35. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

36. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

37. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

38. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

39. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

40. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

41. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

42. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

43. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

44. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

45. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

46. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

47. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

48. Rails 3 Internals
ActiveRelation
Tuesday, September 14, 2010

49. Rails 3 Internals
ActiveRelation
Nova API (where, limit, having)
Relation
Encadeamento
Tuesday, September 14, 2010

50. Rails 3 Internals
ActiveRelation
querys dinâmicas
class Post < ActiveRecord::Base
belongs_to :usuario
end
Tuesday, September 14, 2010

51. Rails 3 Internals
ActiveRelation
querys dinâmicas
class Post < ActiveRecord::Base
belongs_to :usuario
texto end
Tuesday, September 14, 2010

52. Rails 3 Internals
ActiveRelation
querys dinâmicas
class Post < ActiveRecord::Base
belongs_to :usuario
texto end
> 1 ano
Tuesday, September 14, 2010

53. Rails 3 Internals
ActiveRelation
querys dinâmicas
class Post < ActiveRecord::Base
belongs_to :usuario
texto end
> 1 ano
true
Tuesday, September 14, 2010

54. Rails 3 Internals
ActiveRelation
{
:filter => { > rails 2
:conteudo => "texto",
:comentarios => true, conditions
:usuario_id => "1"
}
named scopes
}
Tuesday, September 14, 2010

55. Rails 3 Internals
class PostTest < ActiveSupport::TestCase
setup do
create_posts
end
test "filtro em branco devolve todos os posts" do
assert_equal Post.all, Post.filtered_relation({}).all
end
def create_posts
valid_attributes = {
:body => "Hello.",
:title => "Hi!",
:content => "text",
:user_id => 1,
:published_at => Time.now
}
@base = Post.create(valid_attributes)
@quote = Post.create(valid_attributes.merge(:content => "quote"))
@number2 = Post.create(valid_attributes.merge(:user_id => 2))
@old = Post.create(valid_attribtues.merge(:published_at => 1.year.ago))
end
end
Tuesday, September 14, 2010

56. Rails 3 Internals
class PostTest < ActiveSupport::TestCase
setup do
create_posts
end
test "filtro em branco devolve todos os posts" do
assert_equal Post.all, Post.filtered_relation({}).all
end
def create_posts
valid_attributes = {
:body => "Hello.",
:title => "Hi!",
:content => "text",
:user_id => 1,
:published_at => Time.now
}
@base = Post.create(valid_attributes)
@quote = Post.create(valid_attributes.merge(:content => "quote"))
@number2 = Post.create(valid_attributes.merge(:user_id => 2))
@old = Post.create(valid_attribtues.merge(:published_at => 1.year.ago))
end
end
Tuesday, September 14, 2010

57. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
end
Tuesday, September 14, 2010

58. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
end
end
Tuesday, September 14, 2010

59. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

60. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

61. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base def self.filter_by_content(value, relation)
belongs_to :user relation.where(:content => value)
end
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

62. Rails 3 Internals
ActiveRelation
test "apenas posts com conteudo especifico" do
assert_equal @quote, Post.filtered_relation(:content => "quote").first
end
class Post < ActiveRecord::Base def self.filter_by_content(value, relation)
belongs_to :user relation.where(:content => value)
end
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

63. Rails 3 Internals
ActiveRelation
test "apenas posts com conteudo especifico" do
assert_equal @quote, Post.filtered_relation(:content => "quote").first
end
class Post < ActiveRecord::Base def self.filter_by_content(value, relation)
belongs_to :user relation.where(:content => value)
end
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

64. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

65. Rails 3 Internals
ActiveRelation
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

66. Rails 3 Internals
ActiveRelation
def self.filter_by_published_at(value, relation)
value ? relation.where("published_at < ?", 1.month.ago) : relation
end
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

67. Rails 3 Internals
ActiveRelation
test "given a date filter, only gives us the filtered records" do
assert_equal @old, Post.filtered_relation(:published_at => true).first
end
def self.filter_by_published_at(value, relation)
value ? relation.where("published_at < ?", 1.month.ago) : relation
end
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

68. Rails 3 Internals
ActiveRelation
test "given a date filter, only gives us the filtered records" do
assert_equal @old, Post.filtered_relation(:published_at => true).first
end
def self.filter_by_published_at(value, relation)
value ? relation.where("published_at < ?", 1.month.ago) : relation
end
class Post < ActiveRecord::Base
belongs_to :user
def self.filtered_relation(params)
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

69. Rails 3 Internals
ActiveRelation
test "given a comments count filter, only gives us the filtered records" do
assert_equal @base, Post.filtered_relation(:comments => true).first
end
def self.filter_by_comments(value, relation)
if value
relation.preload(:comments).
select("posts.*, COUNT(comments.id) AS
comment_count").
class Post < ActiveRecord::Base from("posts,
comments").having("comment_count > 0")
belongs_to :user else
relation
def self.filtered_relation(params) end
end
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

70. Rails 3 Internals
ActiveRelation
test "given a comments count filter, only gives us the filtered records" do
assert_equal @base, Post.filtered_relation(:comments => true).first
end
def self.filter_by_comments(value, relation)
if value
relation.preload(:comments).
select("posts.*, COUNT(comments.id) AS
comment_count").
class Post < ActiveRecord::Base from("posts,
comments").having("comment_count > 0")
belongs_to :user else
relation
def self.filtered_relation(params) end
end
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

71. Rails 3 Internals
ActiveRelation
test "given a comments count filter, only gives us the filtered records" do
assert_equal @base, Post.filtered_relation(:comments => true).first
end
def self.filter_by_comments(value, relation)
if value
relation.preload(:comments).
select("posts.*, COUNT(comments.id) AS
comment_count").
class Post < ActiveRecord::Base from("posts,
comments").having("comment_count > 0")
belongs_to :user else
relation
def self.filtered_relation(params) end
end
relation = scoped
params.each do |facet, value|
relation = send("filter_by_#{facet}", value, relation)
end
relation
end
end
Tuesday, September 14, 2010

72. Rails 3 Internals
ActiveRelation
test "given a content and comment filter, gives us filtered records" do
@base.update_attribute(:content, "picture")
assert_equal @base, Post.filtered_relation(:content => "picture", :comments => true).first
end
Tuesday, September 14, 2010

73. Rails 3 Internals
ActiveRelation
test "given a content and comment filter, gives us filtered records" do
@base.update_attribute(:content, "picture")
assert_equal @base, Post.filtered_relation(:content => "picture", :comments => true).first
end
test "given a date and comment filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
assert_equal @base, Post.filtered_relation(:published_at => true, :comments => true).first
end
Tuesday, September 14, 2010

74. Rails 3 Internals
ActiveRelation
test "given a content and comment filter, gives us filtered records" do
@base.update_attribute(:content, "picture")
assert_equal @base, Post.filtered_relation(:content => "picture", :comments => true).first
end
test "given a date and comment filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
assert_equal @base, Post.filtered_relation(:published_at => true, :comments => true).first
end
Tuesday, September 14, 2010

75. Rails 3 Internals
ActiveRelation
test "given a content and comment filter, gives us filtered records" do
@base.update_attribute(:content, "picture")
assert_equal @base, Post.filtered_relation(:content => "picture", :comments => true).first
end
test "given a date and comment filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
assert_equal @base, Post.filtered_relation(:published_at => true, :comments => true).first
end
test "given a date and content filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
@base.update_attribute(:content, "picture")
record = Post.filtered_relation(:published_at => true, :content => "picture").first
assert_equal @base, record
end
Tuesday, September 14, 2010

76. Rails 3 Internals
ActiveRelation
test "given a content and comment filter, gives us filtered records" do
@base.update_attribute(:content, "picture")
assert_equal @base, Post.filtered_relation(:content => "picture", :comments => true).first
end
test "given a date and comment filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
assert_equal @base, Post.filtered_relation(:published_at => true, :comments => true).first
end
test "given a date and content filter, gives us filtered records" do
@base.update_attribute(:published_at, 2.years.ago)
@base.update_attribute(:content, "picture")
record = Post.filtered_relation(:published_at => true, :content => "picture").first
assert_equal @base, record
end
Tuesday, September 14, 2010

77. Rails 3 Internals
ActiveRelation
posts = Post.filtered_relation(:comments => true)
.where(:user_id => 4).limit(3).order("id ASC")
posts.each do |post|
# Do something here...
end
Tuesday, September 14, 2010

78. Rails 3 Internals
Reflexão
Tuesday, September 14, 2010

79. Rails 3 Internals
Reflexão
Tuesday, September 14, 2010

80. Rails 3 Internals
ActiveModel
class Message
extend ActiveModel::Callbacks
define_model_callbacks :deliver
def deliver
_run_deliver_callbacks do
puts "DELIVER!"
end
end
end
Tuesday, September 14, 2010

81. Rails 3 Internals
ActiveModel
class Message
include ActiveModel::Validations
validates_presence_of :body, :user_id
attr_accessor :body, :user_id, :posted_at
end
m = Message.new(nil, 13)
m.valid? # => false
m.body = "Hello there!"
m.valid? # => true
Tuesday, September 14, 2010

82. Rails 3 Internals
ActiveModel
class Message
include ActiveModel::Validations
Attributes
validates_presence_of :body, :user_id
attr_accessor :body, :user_id, :posted_at Callbacks
Errors
end
Observing
m = Message.new(nil, 13) Serialization
m.valid? # => false Translation
m.body = "Hello there!"
m.valid? # => true Validations
Tuesday, September 14, 2010

83. Rails 3 Internals
ActiveModel
class ProperCategoryValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
unless record.user.category_ids.include?(value)
record.errors.add attribute, 'has bad category.'
end
end
end
Tuesday, September 14, 2010

84. Rails 3 Internals
ActiveModel
class ProperCategoryValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
unless record.user.category_ids.include?(value)
record.errors.add attribute, 'has bad category.'
end
end
end
validate :category_id, :proper_category => true
Tuesday, September 14, 2010

85. Rails 3 Internals
ActiveModel
class ProperCategoryValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
unless record.user.category_ids.include?(value)
record.errors.add attribute, 'has bad category.'
end
end
end
validate :category_id, :proper_category => true
Tuesday, September 14, 2010

86. Rails 3 Internals
ActiveModel
class ProperCategoryValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
unless record.user.category_ids.include?(value)
record.errors.add attribute, 'has bad category.'
end
end
end
validate :category_id, :proper_category => true
Tuesday, September 14, 2010

87. Rails 3 Internals
ActiveModel
class ReallyComplexValidator < ActiveModel::Validator
def validate(record)
record.errors[:base] << "Validacao A" unless valid_a (record)
record.errors[:base] << "Validacao B" unless valid_b (record)
record.errors[:base] << "Validacao C" unless valid_c (record)
end
private
def valid_a (record)
# ...
end
def valid_b (record)
# ...
end
def valid_c (record)
# ...
end
end
Tuesday, September 14, 2010

88. Rails 3 Internals
ActiveModel
class ReallyComplexValidator < ActiveModel::Validator
def validate(record)
record.errors[:base] << "Validacao A" unless valid_a (record)
record.errors[:base] << "Validacao B" unless valid_b (record)
record.errors[:base] << "Validacao C" unless valid_c (record)
end
private
def valid_a (record)
# ...
end
def valid_b (record)
# ...
end
def valid_c (record)
# ...
end
end
Tuesday, September 14, 2010

89. Rails 3 Internals
ActiveModel
class ReallyComplexValidator < ActiveModel::Validator
def validate(record)
record.errors[:base] << "Validacao A" unless valid_a (record)
record.errors[:base] << "Validacao B" unless valid_b (record)
record.errors[:base] << "Validacao C" unless valid_c (record)
end
private
def valid_a (record)
class NewsPost < ActiveRecord::Base
# ...
end validates_with ReallyComplexValidator
end
def valid_b (record)
# ...
end
def valid_c (record)
# ...
end
end
Tuesday, September 14, 2010

90. Rails 3 Internals
ActiveModel
template rendering, controller logic, e database query results
<% cache do %>
<% @posts.each do |post| %>
<%= render :partial => 'post', :object => post %>
<% end %>
<% end %>
Tuesday, September 14, 2010

91. Rails 3 Internals
ActiveRecord::Relation
vs
ARel
Tuesday, September 14, 2010

92. Rails 3 Internals
Rails 3 > Modularidade
Desacoplamento
Tuesday, September 14, 2010

93. Rails 3 Internals
Rails 3 > Modularidade
Opnionated ?
Meta-framework ?
Tuesday, September 14, 2010

94. Rails 3 Internals
Rails 3
config.ru
# This file is used by Rack-based servers to start the application.
require ::File.expand_path('../config/environment', __FILE__)
run MinhaApp::Application
Tuesday, September 14, 2010

95. Rails 3 Internals
Railtie > Engine > Application
Inicializar Rails App
Coordenar processos de boot
Carregar plugins
Carregar ActiveSupport
Outros: database, logging, sessions
Tuesday, September 14, 2010

96. Rails 3 Internals
Tuesday, September 14, 2010

97. Rails 3 Internals
Railtie - autoload
Tuesday, September 14, 2010

98. Rails 3 Internals
Railtie - autoload
Tuesday, September 14, 2010

99. Rails 3 Internals
Railtie - autoload
Tuesday, September 14, 2010

100. Rails 3 Internals
Railtie
Tuesday, September 14, 2010

101. Rails 3 Internals
Railtie
Tuesday, September 14, 2010

102. Rails 3 Internals
Railtie
Tuesday, September 14, 2010

103. Rails 3 Internals
Railtie
Tuesday, September 14, 2010

104. Rails 3 Internals
Railtie
Tuesday, September 14, 2010

105. Rails 3 Internals
Railtie
Frameworks Rails > Rails Plugins
Tuesday, September 14, 2010

106. Rails 3 Internals
Railtie ... Plugins....ARel....
Tuesday, September 14, 2010

107. Rails 3 Internals
Railtie ... Plugins....ARel....
require 'filtered_relation'
require 'rails'
module FilteredRelation
class Railtie < Rails::Railtie
railtie_name :filtered_relation
end
end
Tuesday, September 14, 2010

108. Rails 3 Internals
Railtie ... Plugins....ARel....
require 'filtered_relation'
require 'rails'
module FilteredRelation
class Railtie < Rails::Railtie
railtie_name :filtered_relation
código
end
end
Tuesday, September 14, 2010

109. Rails 3 Internals
Links
http://www.engineyard.com/blog/2010/rails-and-merb-merge-orm-agnosticism-part-5-of-6/
http://vimeo.com/14550567
http://github.com/rails/rails/blob/master/activerecord/lib/active_record/relation.rb
http://piotrsarnacki.com/2010/06/18/rails-internals-railties/
http://rubyonrails.org/screencasts/rails3/action-controller
http://www.igvita.com/2010/08/04/rails-3-internals-railtie-creating-plugins/
http://piotrsarnacki.com/2010/06/18/rails-internals-railties/
http://metautonomo.us/2010/05/11/activerecord-relation-vs-arel/
Tuesday, September 14, 2010

110. Obrigado!
Rails 3 Internals
Conhecendo detalhes do framework que fazem a diferença.
Anderson Leite
@anderson_leite
www.andersonleite.com.br
Tuesday, September 14, 2010