Ruby on Rails e Agilidade em São Carlos.

1. Tuesday, December 15, 2009

2. Ruby on Rails
Tuesday, December 15, 2009

3. AkitaOnRails.com
slideshare.net/akitaonrails
Tuesday, December 15, 2009

4. Tuesday, December 15, 2009

5. > 100 slides
< 1 hora
Tuesday, December 15, 2009

6. www.slideshare.net/akitaonrails
fabio.akita@locaweb.com.br
Tuesday, December 15, 2009

7. Tuesday, December 15, 2009

8. Tuesday, December 15, 2009

9. Tuesday, December 15, 2009

10. Ruby on Rails 2.3
Ruby 1.8
“Novo” Ruby 1.9
Tuesday, December 15, 2009

11. Ruby on Rails 2.3
Ruby 1.8
“Novo” Ruby 1.9
Tuesday, December 15, 2009

12. Ruby on Rails 2.3
Ruby 1.8
“Novo” Ruby 1.9
Tuesday, December 15, 2009

13. “Matz”
1993
Tuesday, December 15, 2009

14. Tuesday, December 15, 2009

15. “Prag Dave”
2001
Tuesday, December 15, 2009

16. Tuesday, December 15, 2009

17. “DHH”
2004
Tuesday, December 15, 2009

18. Tuesday, December 15, 2009

19. 07/2004 0.5
12/2005 1.0
03/2006 1.1
01/2007 1.2
12/2007 2.0
06/2008 2.1
11/2008 2.2
03/2009 2.3
2009? 3.0
Tuesday, December 15, 2009

20. Tuesday, December 15, 2009

21. Charles Nutter
2006
Tuesday, December 15, 2009

22. Tuesday, December 15, 2009

23. Tuesday, December 15, 2009

24. Tuesday, December 15, 2009

25. Tuesday, December 15, 2009

26. “Tornar as coisas
simples fáceis e as
coisas complexas
possíveis”
Filoso a Ruby
Tuesday, December 15, 2009

27. Tuesday, December 15, 2009

28. Tuesday, December 15, 2009

29. Tuesday, December 15, 2009

30. Tuesday, December 15, 2009

31. Orientação a
Objetos?
Tuesday, December 15, 2009

32. Tuesday, December 15, 2009

33. Alan Kay Dan Ingalls
Tuesday, December 15, 2009

34. Alan Kay
Tuesday, December 15, 2009

35. Alan Kay
Tuesday, December 15, 2009

36. Eu inventei o termo
‘orientação a
objetos’, e posso
lhes dizer que não
estava pensando em
C++
Alan Kay
Tuesday, December 15, 2009

37. Meta-
programação
Tuesday, December 15, 2009

38. Meta-
apresentação
Tuesday, December 15, 2009

39. Tuesday, December 15, 2009

40. Ruby on Rails
Tuesday, December 15, 2009

41. Código que gera Código
Convention over Con guration
Don’t Repeat Yourself
Extreme Programming
Tuesday, December 15, 2009

42. Código que gera Código
Convention over Con guration
Don’t Repeat Yourself
Extreme Programming
Tuesday, December 15, 2009

43. Código que gera Código
Convention over Con guration
Don’t Repeat Yourself
Extreme Programming
Tuesday, December 15, 2009

44. Código que gera Código
Convention over Con guration
Don’t Repeat Yourself
Extreme Programming
Tuesday, December 15, 2009

45. Restful Resources
Unicode, Time Zone, i18n
Segurança (XSS, CSRF, Injection)
Rack Support (Middlewares)
Tuesday, December 15, 2009

46. Restful Resources
Unicode, Time Zone, i18n
Segurança (XSS, CSRF, Injection)
Rack Support (Middlewares)
Tuesday, December 15, 2009

47. Restful Resources
Unicode, Time Zone, i18n
Segurança (XSS, CSRF, Injection)
Rack Support (Middlewares)
Tuesday, December 15, 2009

48. Restful Resources
Unicode, Time Zone, i18n
Segurança (XSS, CSRF, Injection)
Rack Support (Middlewares)
Tuesday, December 15, 2009

49. Tuesday, December 15, 2009

50. Tuesday, December 15, 2009

51. Tuesday, December 15, 2009

52. Tuesday, December 15, 2009

53. Tuesday, December 15, 2009

54. Tuesday, December 15, 2009

55. Tuesday, December 15, 2009

56. Tuesday, December 15, 2009

57. Tuesday, December 15, 2009

58. Tuesday, December 15, 2009

59. Tuesday, December 15, 2009

60. Tuesday, December 15, 2009

61. Tuesday, December 15, 2009

62. Tuesday, December 15, 2009

63. 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
Tuesday, December 15, 2009

64. 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
Tuesday, December 15, 2009

65. 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
Tuesday, December 15, 2009

66. 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
Tuesday, December 15, 2009

67. 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
Tuesday, December 15, 2009

68. 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
Tuesday, December 15, 2009

69. 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
Tuesday, December 15, 2009

70. 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? %>
Tuesday, December 15, 2009

71. 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? %>
Tuesday, December 15, 2009

72. 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? %>
Tuesday, December 15, 2009

73. 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
Tuesday, December 15, 2009

74. 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
Tuesday, December 15, 2009

75. 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
Tuesday, December 15, 2009

76. 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
Tuesday, December 15, 2009

77. Rotas RESTFul
GET /products/new
ActionController::Routing::Routes.draw do |map|
GET /products
map.resourcesPOST /products
:products
map.resources :addresses
map.resourcesGET /products/1 => [:line_items]
:orders, :has_many
map.namespaceGET /products/1/edit
:admin do |admin|
admin.resources :users
PUT /products/1
admin.resources :products
end DESTROY /products/1
end
Tuesday, December 15, 2009

78. 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
Tuesday, December 15, 2009

79. 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
Tuesday, December 15, 2009

80. 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
Tuesday, December 15, 2009

81. “Beautiful Code”
Tuesday, December 15, 2009

82. @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;
}
Tuesday, December 15, 2009

83. 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;
}
}
Tuesday, December 15, 2009

84. 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
Tuesday, December 15, 2009

85. 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
Tuesday, December 15, 2009

86. 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
Tuesday, December 15, 2009

87. 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
Tuesday, December 15, 2009

88. 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
Tuesday, December 15, 2009

89. 190
vs
40
Tuesday, December 15, 2009

90. “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
Tuesday, December 15, 2009

91. “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
Tuesday, December 15, 2009

92. “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
Tuesday, December 15, 2009

93. “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
Tuesday, December 15, 2009

94. Ferramentas
Ágeis
Tuesday, December 15, 2009

95. Gitorious
Repositórios
Github
Integração Integrity
Contínua Cruise Control
Capistrano
Deployment
Puppet
Monitoramento New Relic
Tuesday, December 15, 2009

96. Gitorious
Repositórios
Github
Integração Integrity
Contínua Cruise Control
Capistrano
Deployment
Puppet
Monitoramento New Relic
Tuesday, December 15, 2009

97. Gitorious
Repositórios
Github
Integração Integrity
Contínua Cruise Control
Capistrano
Deployment
Puppet
Monitoramento New Relic
Tuesday, December 15, 2009

98. Gitorious
Repositórios
Github
Integração Integrity
Contínua Cruise Control
Capistrano
Deployment
Puppet
Monitoramento New Relic
Tuesday, December 15, 2009

99. Tuesday, December 15, 2009

100. Tuesday, December 15, 2009

101. Comunidade
Tuesday, December 15, 2009

102. Tuesday, December 15, 2009

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119. Tuesday, December 15, 2009

120. Tuesday, December 15, 2009

121. Tuesday, December 15, 2009

122. O que dizem
por aí ...
Tuesday, December 15, 2009

123. Pouco usado
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124. Tuesday, December 15, 2009

125. Tuesday, December 15, 2009

126. Tuesday, December 15, 2009

127. Tuesday, December 15, 2009

128. Tuesday, December 15, 2009

129. Tuesday, December 15, 2009

130. Rails não Escala
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131. Tuesday, December 15, 2009

132. Tuesday, December 15, 2009

133. Blaine Cook
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter
Tuesday, December 15, 2009

134. 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
Tuesday, December 15, 2009

135. 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
Tuesday, December 15, 2009

136. “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
Tuesday, December 15, 2009

137. “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
Tuesday, December 15, 2009

138. Ruby é Lento
Tuesday, December 15, 2009

139. x mais lento que C++
Tuesday, December 15, 2009

140. x mais lento que C++
0 50 100 150 200
Python 2
Ruby 1.9
Perl
JRuby
Python 3
PHP
Ruby 1.8.6
Tuesday, December 15, 2009

141. Homepage: 331 ms
Tuesday, December 15, 2009

142. Homepage: 331 ms
Total: 5.45 s
Tuesday, December 15, 2009

143. Tuesday, December 15, 2009

144. Performance
!=
Escalabilidade
Tuesday, December 15, 2009

145. Outros Mitos?
Tuesday, December 15, 2009

146. Tuesday, December 15, 2009

147. Mais Produtivo
“Melhor”
Anti-legado
Tuesday, December 15, 2009

148. Sempre se Lembre
Poderíamos contratar um Macaco Treinado
para fazer seu Trabalho!
Tuesday, December 15, 2009

149. Agilidade
Tuesday, December 15, 2009

150. Tuesday, December 15, 2009

151. Robert C. Martin
Tuesday, December 15, 2009

152. Tuesday, December 15, 2009

153. Código Limpo
Tuesday, December 15, 2009

154. Tuesday, December 15, 2009

155. Test Driven
Development
Tuesday, December 15, 2009

156. Tuesday, December 15, 2009

157. 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
Tuesday, December 15, 2009

158. 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
Tuesday, December 15, 2009

159. 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
Tuesday, December 15, 2009

160. 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
Tuesday, December 15, 2009

161. Tuesday, December 15, 2009

162. 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
Tuesday, December 15, 2009

163. 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
Tuesday, December 15, 2009

164. Tuesday, December 15, 2009

165. Tuesday, December 15, 2009

166. Não é mais
demorado?
Tuesday, December 15, 2009

167. Produtividade
Cowboy Profissional
Tuesday, December 15, 2009

168. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

169. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

170. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

171. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

172. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

173. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

174. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

175. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

176. Produtividade
Cowboy Profissional
70.00
52.50
Produtividade
35.00
17.50
0
1 2 3 4 5 6 7 8
Tempo
Tuesday, December 15, 2009

177. Tuesday, December 15, 2009

178. Tuesday, December 15, 2009

179. 237 Equipes
137 Finalizadas
Tuesday, December 15, 2009

180. Tuesday, December 15, 2009

181. Empreendedorismo
Código e “Forma”
Ciclo de Vida de Projetos
Comunidade Open Source
Tuesday, December 15, 2009

182. Empreendedorismo
Código e “Forma”
Ciclo de Vida de Projetos
Comunidade Open Source
Tuesday, December 15, 2009

183. Empreendedorismo
Código e “Forma”
Ciclo de Vida de Projetos
Comunidade Open Source
Tuesday, December 15, 2009

184. Empreendedorismo
Código e “Forma”
Ciclo de Vida de Projetos
Comunidade Open Source
Tuesday, December 15, 2009

185. Post hoc ergo
propter hoc
Tuesday, December 15, 2009

186. Pro ssionalismo
Tuesday, December 15, 2009

187. Tuesday, December 15, 2009

188. Obrigado!
akitaonrails.com
railssummit.com.br
Tuesday, December 15, 2009