Mais uma introdução à filosofia das comunidades Ruby e Rails, com ênfase no Ecossistema mais do que na Tecnologia. Vídeo da 37signals: http://www.vimeo.com/6028818 Vídeo do Uncle Bob: http://www.vimeo.com/5196176

1. Ruby on Rails
Friday, August 7, 2009

2. AkitaOnRails.com
slideshare.net/akitaonrails
Friday, August 7, 2009

3. 2008
Friday, August 7, 2009

4. 2008
Friday, August 7, 2009

5. 13 e 14
Outubro
2009
Friday, August 7, 2009

6. Friday, August 7, 2009

7. ~140 slides
~45 min
Friday, August 7, 2009

8. www.slideshare.net/akitaonrails
fabio.akita@locaweb.com.br
Friday, August 7, 2009

9. Friday, August 7, 2009

10. Friday, August 7, 2009

11. Friday, August 7, 2009

12. Ruby on Rails 2.3
Ruby 1.8
Novo Ruby 1.9
Friday, August 7, 2009

13. Ruby on Rails 2.3
Ruby 1.8
Novo Ruby 1.9
Friday, August 7, 2009

14. Ruby on Rails 2.3
Ruby 1.8
Novo Ruby 1.9
Friday, August 7, 2009

15. “Matz”
1993
Friday, August 7, 2009

16. Friday, August 7, 2009

17. “Prag Dave”
2001
Friday, August 7, 2009

18. Friday, August 7, 2009

19. “DHH”
2004
Friday, August 7, 2009

20. Friday, August 7, 2009

21. Friday, August 7, 2009

22. Charles Nutter
2006
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23. Friday, August 7, 2009

24. Friday, August 7, 2009

25. Friday, August 7, 2009

26. Friday, August 7, 2009

27. “Tornar as coisas
simples fáceis e as
coisas complexas
possíveis”
Filosofia Ruby
Friday, August 7, 2009

28. Friday, August 7, 2009

29. Friday, August 7, 2009

30. Friday, August 7, 2009

31. Friday, August 7, 2009

32. O que dizem
por aí ...
Friday, August 7, 2009

33. Pouco usado
Friday, August 7, 2009

34. Rails não Escala
Friday, August 7, 2009

35. Ruby é Lento
Friday, August 7, 2009

36. WTF!?
Friday, August 7, 2009

37. Pouco usado
Friday, August 7, 2009

38. Friday, August 7, 2009

39. Friday, August 7, 2009

40. Friday, August 7, 2009

41. Friday, August 7, 2009

42. Friday, August 7, 2009

43. Friday, August 7, 2009

44. Friday, August 7, 2009

45. Friday, August 7, 2009

46. Friday, August 7, 2009

47. Friday, August 7, 2009

48. Friday, August 7, 2009

49. Rails não Escala
Friday, August 7, 2009

50. Friday, August 7, 2009

51. Blaine Cook
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter
Friday, August 7, 2009

52. Para colocar as coisas em
perspectiva, o Friendster foi
escrito em Java e eles
mudaram para PHP. MySpace
foi escrito em ColdFusion e
eles mudaram para ASP.NET.
Blaine Cook
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter
Friday, August 7, 2009

53. Para colocar as coisas em
perspectiva, o Friendster foi
escrito em Java e eles
mudaram para PHP. MySpace
foi escrito em ColdFusion e
eles mudaram para ASP.NET.
Quando as pessoas caem em
problemas de escalabilidade,
normalmente acham que a
linguagem é o problema, mas
eu acho que isso raramente
é a realidade. Blaine Cook
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter
Friday, August 7, 2009

54. “O The New York Times usou Ruby on Rails para
agregar, analizar e mostrar os resultados das
eleições em quase tempo real em um de seus
sites mais acessados de todos os tempos.”
http://www.computerworld.com.au/article/268003/ruby_rails_rolls_into_enterprise?fp=16&fpid=1
Friday, August 7, 2009

55. “O The New York Times usou Ruby on Rails para
agregar, analizar e mostrar os resultados das
eleições em quase tempo real em um de seus
sites mais acessados de todos os tempos.”
http://www.computerworld.com.au/article/268003/ruby_rails_rolls_into_enterprise?fp=16&fpid=1
Friday, August 7, 2009

56. Ruby é Lento
Friday, August 7, 2009

57. x mais lento que C++
Friday, August 7, 2009

58. x mais lento que C++
0
50
100
Python 2 150
Ruby 1.9 200
Perl
JRuby
Python 3
PHP
Ruby 1.8.6
Friday, August 7, 2009

59. Homepage: 331 ms
Friday, August 7, 2009

60. Homepage: 331 ms
Total: 5.45 s
Friday, August 7, 2009

61. Friday, August 7, 2009

62. Performance
!=
Escalabilidade
Friday, August 7, 2009

63. Ruby on Rails
Friday, August 7, 2009

64. Friday, August 7, 2009

65. Código que gera Código
Convention over Configuration
Don’t Repeat Yourself
Extreme Programming
Friday, August 7, 2009

66. Código que gera Código
Convention over Configuration
Don’t Repeat Yourself
Extreme Programming
Friday, August 7, 2009

67. Código que gera Código
Convention over Configuration
Don’t Repeat Yourself
Extreme Programming
Friday, August 7, 2009

68. Código que gera Código
Convention over Configuration
Don’t Repeat Yourself
Extreme Programming
Friday, August 7, 2009

69. Friday, August 7, 2009

70. Friday, August 7, 2009

71. Friday, August 7, 2009

72. Friday, August 7, 2009

73. Friday, August 7, 2009

74. Friday, August 7, 2009

75. Friday, August 7, 2009

76. Friday, August 7, 2009

77. Friday, August 7, 2009

78. Friday, August 7, 2009

79. Friday, August 7, 2009

80. Friday, August 7, 2009

81. Friday, August 7, 2009

82. Friday, August 7, 2009

83. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

84. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

85. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

86. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

87. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

88. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

89. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

90. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

91. Model
class Product < ActiveRecord::Base
after_create :set_initial_inventory
has_many :variants, :dependent => :destroy
has_many :images, :as => :viewable, :order => :position,
:dependent => :destroy
has_many :properties, :through => :product_properties
Product.find(1)
belongs_to :tax_category
validates_presence_of :name
validates_presence_of :master_price
validates_presence_of :description
make_permalink :with => :name, :field => :permalink
end
Friday, August 7, 2009

92. Views ERB
<div id="product-listing">
<%= breadcrumbs(@taxon) %>
<br/>
<%= render :partial => "shared/products.html.erb",
:locals => {:products => @products, :taxon => @taxon } %>
</div>
<% content_for :sidebar do %>
<td id="shop-by-col" valign="top">
<%= render :partial => "shared/taxonomies" %>
</td>
<% end %>
<%= render :partial => 'shared/paginate',
:locals => {:collection => @products, :options => {}}
unless @products.empty? %>
Friday, August 7, 2009

93. Views ERB
<div id="product-listing">
<%= breadcrumbs(@taxon) %>
<br/>
<%= render :partial => "shared/products.html.erb",
:locals => {:products => @products, :taxon => @taxon } %>
</div>
<% content_for :sidebar do %>
<td id="shop-by-col" valign="top">
<%= render :partial => "shared/taxonomies" %>
</td>
<% end %>
<%= render :partial => 'shared/paginate',
:locals => {:collection => @products, :options => {}}
unless @products.empty? %>
Friday, August 7, 2009

94. Views ERB
<div id="product-listing">
<%= breadcrumbs(@taxon) %>
<br/>
<%= render :partial => "shared/products.html.erb",
:locals => {:products => @products, :taxon => @taxon } %>
</div>
<% content_for :sidebar do %>
<td id="shop-by-col" valign="top">
<%= render :partial => "shared/taxonomies" %>
</td>
<% end %>
<%= render :partial => 'shared/paginate',
:locals => {:collection => @products, :options => {}}
unless @products.empty? %>
Friday, August 7, 2009

95. Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
map.resources :products
map.resources :addresses
map.resources :orders, :has_many => [:line_items]
map.namespace :admin do |admin|
admin.resources :users
admin.resources :products
end
end
Friday, August 7, 2009

96. Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
map.resources :products
map.resources :addresses
map.resources :orders, :has_many => [:line_items]
map.namespace :admin do |admin|
admin.resources :users
admin.resources :products
end
end
Friday, August 7, 2009

97. Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
map.resources :products
map.resources :addresses
map.resources :orders, :has_many => [:line_items]
map.namespace :admin do |admin|
admin.resources :users
admin.resources :products
end
end
Friday, August 7, 2009

98. Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
map.resources :products
map.resources :addresses
map.resources :orders, :has_many => [:line_items]
map.namespace :admin do |admin|
admin.resources :users
admin.resources :products
end
end
Friday, August 7, 2009

99. Rotas RESTFul
GET /products/new
ActionController::Routing::Routes.draw do |map|
GET /products
POST /products
map.resources :products
map.resources :addresses
map.resourcesGET /products/1 => [:line_items]
:orders, :has_many
map.namespaceGET /products/1/edit
:admin do |admin|
PUT /products/1
admin.resources :users
admin.resources :products
end DESTROY /products/1
end
Friday, August 7, 2009

100. Controller
class UsersController < Spree::BaseController
resource_controller
before_filter :initialize_extension_partials
actions :all, :except => [:index, :destroy]
show.before do
@orders = Order.checkout_completed(true)
.find_all_by_user_id(current_user.id)
end
create.after { self.current_user = @user }
create.response do |wants|
wants.html { redirect_back_or_default(products_path) }
end
end
Friday, August 7, 2009

101. Controller
class UsersController < Spree::BaseController
resource_controller
before_filter :initialize_extension_partials
actions :all, :except => [:index, :destroy]
show.before do
@orders = Order.checkout_completed(true)
.find_all_by_user_id(current_user.id)
end
create.after { self.current_user = @user }
create.response do |wants|
wants.html { redirect_back_or_default(products_path) }
end
end
Friday, August 7, 2009

102. Controller
class UsersController < Spree::BaseController
resource_controller
before_filter :initialize_extension_partials
actions :all, :except => [:index, :destroy]
show.before do
@orders = Order.checkout_completed(true)
.find_all_by_user_id(current_user.id)
end
create.after { self.current_user = @user }
create.response do |wants|
wants.html { redirect_back_or_default(products_path) }
end
end
Friday, August 7, 2009

103. Controller
class UsersController < Spree::BaseController
resource_controller
before_filter :initialize_extension_partials
actions :all, :except => [:index, :destroy]
show.before do
@orders = Order.checkout_completed(true)
.find_all_by_user_id(current_user.id)
end
create.after { self.current_user = @user }
create.response do |wants|
wants.html { redirect_back_or_default(products_path) }
end
end
Friday, August 7, 2009

104. Controller
class UsersController < Spree::BaseController
resource_controller
before_filter :initialize_extension_partials
actions :all, :except => [:index, :destroy]
show.before do
@orders = Order.checkout_completed(true)
/users/1
.find_all_by_user_id(current_user.id)
end
create.after { self.current_user = @user }
create.response do |wants|
wants.html { redirect_back_or_default(products_path) }
end
end
Friday, August 7, 2009

105. Migrations
class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
change_table :configurations do |t|
t.string :type
end
end
def self.down
change_table :configurations do |t|
t.remove :type
end
rename_table :configurations, :app_configurations
end
end
Friday, August 7, 2009

106. Migrations
class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
change_table :configurations do |t|
t.string :type
end
end
def self.down
change_table :configurations do |t|
t.remove :type
end
rename_table :configurations, :app_configurations
end
end
Friday, August 7, 2009

107. Migrations
class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
change_table :configurations do |t|
t.string :type
end
end
def self.down
change_table :configurations do |t|
t.remove :type
end
rename_table :configurations, :app_configurations
end
end
Friday, August 7, 2009

108. Migrations
class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
change_table :configurations do |t|
t.string :type
end
end
def self.down
change_table :configurations do |t|
t.remove :type
end
rename_table :configurations, :app_configurations
end
end
Friday, August 7, 2009

109. Migrations
class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
change_table :configurations do |t|
t.string :type
end
end rake db:migrate
def self.down
change_table :configurations do |t|
t.remove :type
end
rename_table :configurations, :app_configurations
end
end
Friday, August 7, 2009

110. Open Source
Friday, August 7, 2009

111. Friday, August 7, 2009

112. describe BankAccount do
before :each do
@bank_account = BankAccount.new :balance => 250
end
it "should not be valid" do
@bank_account.should be_valid
end
it "should transfer funds successfully" do
@bank_account.should_receive(:transfer)
.with_args(:amount => 100)
.and_return(true)
@bank_account.execute_transaction(:amount => 100)
@bank_account.balance.should == 150
end
end
Friday, August 7, 2009

113. describe BankAccount do
before :each do
@bank_account = BankAccount.new :balance => 250
end
it "should not be valid" do
@bank_account.should be_valid
end
it "should transfer funds successfully" do
@bank_account.should_receive(:transfer)
.with_args(:amount => 100)
.and_return(true)
@bank_account.execute_transaction(:amount => 100)
@bank_account.balance.should == 150
end
end
Friday, August 7, 2009

114. describe BankAccount do
before :each do
@bank_account = BankAccount.new :balance => 250
end
it "should not be valid" do
@bank_account.should be_valid
end
it "should transfer funds successfully" do
@bank_account.should_receive(:transfer)
.with_args(:amount => 100)
.and_return(true)
@bank_account.execute_transaction(:amount => 100)
@bank_account.balance.should == 150
end
end
Friday, August 7, 2009

115. describe BankAccount do
before :each do
@bank_account = BankAccount.new :balance => 250
end
it "should not be valid" do
@bank_account.should be_valid
end
it "should transfer funds successfully" do
@bank_account.should_receive(:transfer)
.with_args(:amount => 100)
.and_return(true)
@bank_account.execute_transaction(:amount => 100)
@bank_account.balance.should == 150
end
end
Friday, August 7, 2009

116. Friday, August 7, 2009

117. Funcionalidade: Adição
Para evitar erros bobos
Como um péssimo matemático
Eu quero saber como somar dois números
Cenário: Adicionar dois números
Dado que eu digitei 50 na calculadora
E que eu digitei 70 na calculadora
Quando eu aperto o botão de soma
Então o resultado na calculadora deve ser 120
Friday, August 7, 2009

118. Funcionalidade: Adição
Para evitar erros bobos
Como um péssimo matemático
Eu quero saber como somar dois números
Cenário: Adicionar dois números
Dado que eu digitei 50 na calculadora
E que eu digitei 70 na calculadora
Quando eu aperto o botão de soma
Então o resultado na calculadora deve ser 120
Friday, August 7, 2009

119. Before do
@calc = Calculadora.new
end
Dado /que eu digitei (d+) na calculadora/ do |n|
@calc.push n.to_i
end
Quando 'eu aperto o botão de soma' do
@result = @calc.soma
end
Então /o resultado na calculadora deve ser (d*)/ do |result|
@result.should == result.to_i
end
Friday, August 7, 2009

120. Before do
@calc = Calculadora.new
end
Dado /que eu digitei (d+) na calculadora/ do |n|
@calc.push n.to_i
end
Quando 'eu aperto o botão de soma' do
@result = @calc.soma
end
Então /o resultado na calculadora deve ser (d*)/ do |result|
@result.should == result.to_i
end
Friday, August 7, 2009

121. Before do
@calc = Calculadora.new
end
Dado /que eu digitei (d+) na calculadora/ do |n|
@calc.push n.to_i
end
Quando 'eu aperto o botão de soma' do
@result = @calc.soma
end
Então /o resultado na calculadora deve ser (d*)/ do |result|
@result.should == result.to_i
end
Friday, August 7, 2009

122. Before do
@calc = Calculadora.new
end
Dado /que eu digitei (d+) na calculadora/ do |n|
@calc.push n.to_i
end
Quando 'eu aperto o botão de soma' do
@result = @calc.soma
end
Então /o resultado na calculadora deve ser (d*)/ do |result|
@result.should == result.to_i
end
Friday, August 7, 2009

123. class SignupTest < ActionController::IntegrationTest
def test_trial_account_sign_up
visit home_path
click_link "Sign up"
fill_in "Email", :with => "good@example.com"
select "Free account"
click_button "Register"
end
end
Friday, August 7, 2009

124. Friday, August 7, 2009

125. rspec rspec.info
cucumber cukes.info
shoulda thoughtbot.com/projects/shoulda
webrat github.com/brynary/webrat
integrity integrityapp.com
ZenTest zenspider.com
Friday, August 7, 2009

126. • plugins de Active Record
• plugins de Views
• plugins de Localização
• CMS
• Parsers
• Autenticadores/Autorizadores
Friday, August 7, 2009

127. “Beautiful Code”
Friday, August 7, 2009

128. @Transient
public BigDecimal getTotal()
//$Id: Booking.java 5579 2007-06-27 00:06:49Z gavin $ {
package org.jboss.seam.example.booking; return hotel.getPrice().multiply( new BigDecimal( getNights() ) );
}
import java.io.Serializable;
import java.math.BigDecimal; @Transient
import java.text.DateFormat; public int getNights()
import java.util.Date; {
return (int) ( checkoutDate.getTime() - checkinDate.getTime() ) /
import javax.persistence.Basic; 1000 / 60 / 60 / 24;
import javax.persistence.Entity; }
import javax.persistence.GeneratedValue;
import javax.persistence.Id; @Id @GeneratedValue
import javax.persistence.ManyToOne; public Long getId()
import javax.persistence.Temporal; {
import javax.persistence.TemporalType; return id;
import javax.persistence.Transient; }
public void setId(Long id)
import org.hibernate.validator.Length; {
import org.hibernate.validator.NotNull; this.id = id;
import org.hibernate.validator.Pattern; }
import org.jboss.seam.annotations.Name;
@NotNull
@Entity @Basic @Temporal(TemporalType.DATE)
@Name("booking") public Date getCheckinDate()
public class Booking implements Serializable {
{ return checkinDate;
private Long id; }
private User user; public void setCheckinDate(Date datetime)
private Hotel hotel; {
private Date checkinDate; this.checkinDate = datetime;
private Date checkoutDate; }
private String creditCard;
private String creditCardName; @ManyToOne @NotNull
private int creditCardExpiryMonth; public Hotel getHotel()
private int creditCardExpiryYear; {
private boolean smoking; return hotel;
private int beds; }
public void setHotel(Hotel hotel)
public Booking() {} {
this.hotel = hotel;
public Booking(Hotel hotel, User user) }
{
this.hotel = hotel; @ManyToOne @NotNull
this.user = user; public User getUser()
} {
return user;
}
Friday, August 7, 2009

129. public int getBeds()
public void setUser(User user)
{
{
return beds;
this.user = user;
}
}
public void setBeds(int beds)
@Basic @Temporal(TemporalType.DATE)
{
@NotNull
this.beds = beds;
public Date getCheckoutDate()
}
{
@NotNull(message="Credit card name is required")
return checkoutDate;
@Length(min=3, max=70, message="Credit card name is required")
}
public String getCreditCardName()
public void setCheckoutDate(Date checkoutDate)
{
{
return creditCardName;
this.checkoutDate = checkoutDate;
}
}
public void setCreditCardName(String creditCardName)
@NotNull(message="Credit card number is required")
{
@Length(min=16, max=16, message="Credit card number must 16 digits long")
this.creditCardName = creditCardName;
@Pattern(regex="^d*$", message="Credit card number must be numeric")
}
public String getCreditCard()
{
public int getCreditCardExpiryMonth()
return creditCard;
{
}
return creditCardExpiryMonth;
}
public void setCreditCard(String creditCard)
{
public void setCreditCardExpiryMonth(int creditCardExpiryMonth)
this.creditCard = creditCard;
{
}
this.creditCardExpiryMonth = creditCardExpiryMonth;
}
@Transient
public String getDescription()
public int getCreditCardExpiryYear()
{
{
DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM);
return creditCardExpiryYear;
return hotel==null ? null : hotel.getName() +
}
", " + df.format( getCheckinDate() ) +
" to " + df.format( getCheckoutDate() );
public void setCreditCardExpiryYear(int creditCardExpiryYear)
}
{
this.creditCardExpiryYear = creditCardExpiryYear;
public boolean isSmoking()
}
{
return smoking;
@Override
}
public String toString()
{
public void setSmoking(boolean smoking)
return "Booking(" + user + ","+ hotel + ")";
{
}
this.smoking = smoking;
}
}
Friday, August 7, 2009

130. class Booking < ActiveRecord::Base
belongs_to :hotel
belongs_to :user
validates_presence_of :hotel
validates_presence_of :user
validates_presence_of :credit_card
validates_presence_of :credit_card_name
validates_length_of :credit_card, :within => 16..16
validates_format_of :credit_card, :with => /^d*$/
validates_length_of :credit_card_name, :within => 3..70
def total
hotel.price * nights
end
def nights
((checkout_date - checkin_date) / 1.day).round
end
def to_s
"Booking(#{user},#{hotel})"
end
end
Friday, August 7, 2009

131. class Booking < ActiveRecord::Base
belongs_to :hotel
belongs_to :user
validates_presence_of :hotel
validates_presence_of :user
validates_presence_of :credit_card
validates_presence_of :credit_card_name
validates_length_of :credit_card, :within => 16..16
validates_format_of :credit_card, :with => /^d*$/
validates_length_of :credit_card_name, :within => 3..70
def total
hotel.price * nights
end
def nights
((checkout_date - checkin_date) / 1.day).round
end
def to_s
"Booking(#{user},#{hotel})"
end
end
Friday, August 7, 2009

132. class CreateBookings < ActiveRecord::Migration
def self.up
create_table :bookings do |t|
t.references :user
t.references :hotel
t.datetime :checkin
t.datetime :checkout
t.string :credit_card
t.string :credit_card_name
t.integer :credit_card_expiry_month
t.integer :credit_card_expiry_year
t.boolean :smoking
t.integer :beds
t.timestamps
end
end
def self.down
drop_table :bookings
end
end
Friday, August 7, 2009

133. class CreateBookings < ActiveRecord::Migration
def self.up
create_table :bookings do |t|
t.references :user
t.references :hotel
t.datetime :checkin
t.datetime :checkout
t.string :credit_card
t.string :credit_card_name
t.integer :credit_card_expiry_month
t.integer :credit_card_expiry_year
t.boolean :smoking
t.integer :beds
t.timestamps
end
end
def self.down
drop_table :bookings
end
end
Friday, August 7, 2009

134. class CreateBookings < ActiveRecord::Migration
def self.up
create_table :bookings do |t|
t.references :user
t.references :hotel
t.datetime :checkin
t.datetime :checkout
t.string :credit_card
t.string :credit_card_name
t.integer :credit_card_expiry_month
t.integer :credit_card_expiry_year
t.boolean :smoking
t.integer :beds
t.timestamps
end
end
def self.down
drop_table :bookings
end
end
Friday, August 7, 2009

135. 190
vs
40
Friday, August 7, 2009

136. “Eles servem mais de 23 milhões de visitantes/mês. A conversão resultou em
20 mil linhas de Ruby em vez de 125 mil linhas de Java e, mais importante,
facilitou a dificuldade que tinham em manutenção. Eles também
finalizaram a reescrita do sistema em apenas 3 meses com 4 desenvolvedores.
Uma vez completo e otimizado, o site deles agora é mais rápido que antes.”
http://www.railsonwave.com/railsonwave/2008/6/4/yellowpages-com-migrates-to-rails
Friday, August 7, 2009

137. “Eles servem mais de 23 milhões de visitantes/mês. A conversão resultou em
20 mil linhas de Ruby em vez de 125 mil linhas de Java e, mais importante,
facilitou a dificuldade que tinham em manutenção. Eles também
finalizaram a reescrita do sistema em apenas 3 meses com 4 desenvolvedores.
Uma vez completo e otimizado, o site deles agora é mais rápido que antes.”
http://www.railsonwave.com/railsonwave/2008/6/4/yellowpages-com-migrates-to-rails
Friday, August 7, 2009

138. “Eles servem mais de 23 milhões de visitantes/mês. A conversão resultou em
20 mil linhas de Ruby em vez de 125 mil linhas de Java e, mais importante,
facilitou a dificuldade que tinham em manutenção. Eles também
finalizaram a reescrita do sistema em apenas 3 meses com 4 desenvolvedores.
Uma vez completo e otimizado, o site deles agora é mais rápido que antes.”
http://www.railsonwave.com/railsonwave/2008/6/4/yellowpages-com-migrates-to-rails
Friday, August 7, 2009

139. “Eles servem mais de 23 milhões de visitantes/mês. A conversão resultou em
20 mil linhas de Ruby em vez de 125 mil linhas de Java e, mais importante,
facilitou a dificuldade que tinham em manutenção. Eles também
finalizaram a reescrita do sistema em apenas 3 meses com 4 desenvolvedores.
Uma vez completo e otimizado, o site deles agora é mais rápido que antes.”
http://www.railsonwave.com/railsonwave/2008/6/4/yellowpages-com-migrates-to-rails
Friday, August 7, 2009

140. Friday, August 7, 2009

141. 11 mil
classes!
46 só de
coleções!
Friday, August 7, 2009

142. • Classes:
• Modules: • Array
• Enumerable • Hash
• Comparable • Set
• Sorted Set
Friday, August 7, 2009

143. 1.400 Classes:
•
classesArray
• Modules: •
• Enumerable • Hash
• Comparable 6 de Set
só •
• Sorted
coleções! Set
Friday, August 7, 2009

144. Mitos?
Friday, August 7, 2009

145. Friday, August 7, 2009

146. Mais Produtivo
“Melhor”
Anti-legado
Friday, August 7, 2009

147. Mais Produtivo
“Melhor”
Anti-legado
Friday, August 7, 2009

148. Mais Produtivo
“Melhor”
Anti-legado
Friday, August 7, 2009

149. Agilidade
Friday, August 7, 2009

150. Friday, August 7, 2009

151. Robert C. Martin
Friday, August 7, 2009

152. “Uncle Bob”
Friday, August 7, 2009

153. Código Limpo
Friday, August 7, 2009

154. Friday, August 7, 2009

155. Test Driven
Development
Friday, August 7, 2009

156. Friday, August 7, 2009

157. Ferramentas
Ágeis
Friday, August 7, 2009

158. Gerenciamento
Friday, August 7, 2009

159. Friday, August 7, 2009

160. Friday, August 7, 2009

161. Friday, August 7, 2009

162. Repositórios
Friday, August 7, 2009

163. Friday, August 7, 2009

164. Friday, August 7, 2009

165. Integração
Contínua
Friday, August 7, 2009

166. Friday, August 7, 2009

167. Friday, August 7, 2009

168. Friday, August 7, 2009

169. Deployment
Friday, August 7, 2009

170. Friday, August 7, 2009

171. Friday, August 7, 2009

172. Friday, August 7, 2009

173. Monitoramento
Friday, August 7, 2009

174. Friday, August 7, 2009

175. Friday, August 7, 2009

176. Friday, August 7, 2009

177. Comunidade
Friday, August 7, 2009

178. peepcode.com
Geoffrey
Friday, August 7, 2009

179. railsenvy.com
Jason e Gregg
Friday, August 7, 2009

180. railscasts.com
Ryan Bates
Friday, August 7, 2009

181. guias.rubyonrails.pro.br
Pratik Naik
Friday, August 7, 2009

182. rubylearning.org
Satish Talim
Friday, August 7, 2009

183. rubyinside.com.br
Peter Cooper
Friday, August 7, 2009

184. why.nomedojogo.com
_why
Friday, August 7, 2009

185. Friday, August 7, 2009

186. Friday, August 7, 2009

187. Friday, August 7, 2009

188. Friday, August 7, 2009

189. Friday, August 7, 2009

190. Friday, August 7, 2009

191. Friday, August 7, 2009

192. Obrigado!
akitaonrails.com
Friday, August 7, 2009