Ceara On Rails 2009

1. Tuesday, December 15, 2009

2. Filoso a Ruby on Rails Tuesday, December 15, 2009

3. AkitaOnRails.com Tuesday, December 15, 2009

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

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

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

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

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

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

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

30. Meta-programação Tuesday, December 15, 2009

31. Sim, faz praticamente tudo Tuesday, December 15, 2009

34. Demo Tuesday, December 15, 2009

37. Charles Nutter 2006 Tuesday, December 15, 2009

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

41. Ruby on Rails Tuesday, December 15, 2009

42. Código que gera Código Convention over Con guration Extreme Programming Tuesday, December 15, 2009

45. Restful Resources Unicode, Time Zone, i18n Segurança (XSS, CSRF, Injection) Suporte a vários bancos de dados Envio/Recebimento de e-mails Tuesday, December 15, 2009

50. gem install rails Tuesday, December 15, 2009

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

52. @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

53. 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

54. 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

55. 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

56. 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

59. 190 vs 40 Tuesday, December 15, 2009

60. “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

64. Ferramentas Ágeis Tuesday, December 15, 2009

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

69. Mitos? Tuesday, December 15, 2009

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

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

74. Como é feito um software? Tuesday, December 15, 2009

75. “Engenharia” Tuesday, December 15, 2009

80. Análise Codi cação Tuesday, December 15, 2009

81. Programação “Compilação” Tuesday, December 15, 2009

82. “Codi cador” Tuesday, December 15, 2009

83. “Arquiteto” Tuesday, December 15, 2009

84. Standish Group - CHAOS Report 2009 Tuesday, December 15, 2009

85. Fracasso Total Sucesso 24% 32% Fracasso Médio 44% Standish Group - CHAOS Report 2009 Tuesday, December 15, 2009

86. Quebre Regras! Tuesday, December 15, 2009

88. Prazo Custo Tuesday, December 15, 2009

89. Escopo Prazo Custo Tuesday, December 15, 2009

90. Futuro Previsível? Tuesday, December 15, 2009

92. Winston W. Royce - 1970 Tuesday, December 15, 2009

93. “Eu acredito neste conceito mas a implementação descrita acima é arriscada e convida falhas.” Winston W. Royce - 1970 Tuesday, December 15, 2009

96. crédito: Jeﬀ Patton Tuesday, December 15, 2009

107. “Soft”ware exige técnica e criatividade Tuesday, December 15, 2009

108. Trabalho Previsível? Tuesday, December 15, 2009

110. // create some properties and get the default Session Properties props = new Properties(); props.put("mail.smtp.host", _smtpHost); Session session = Session.getDefaultInstance(props, null); // create a message Address replyToList[] = { new InternetAddress(replyTo) }; Message newMessage = new MimeMessage(session); if (_fromName != null) newMessage.setFrom(new InternetAddress(from, _fromName + " on behalf of " + replyTo)); else newMessage.setFrom(new InternetAddress(from)); newMessage.setReplyTo(replyToList); newMessage.setRecipients(Message.RecipientType.BCC, _toList); newMessage.setSubject(subject); newMessage.setSentDate(sentDate); // send newMessage Transport transport = session.getTransport(SMTP_MAIL); transport.connect(_smtpHost, _user, _password); transport.sendMessage(newMessage, _toList); Tuesday, December 15, 2009

111. new EmailMessage() .from("demo@guilhermechapiewski.com") .to("destination@address.com") .withSubject("Fluent Mail API") .withBody("Demo message") .send(); crédito: Guilherme Chapiewski Tuesday, December 15, 2009

112. Escopo Prazo Custo Tuesday, December 15, 2009

113. Escopo Qualidade Variável Prazo Custo Tuesday, December 15, 2009

114. Qualidade Escopo Variável Prazo Custo Tuesday, December 15, 2009

115. Qualidade Escopo Variável Prazo Custo Tuesday, December 15, 2009

116. Agilidade Tuesday, December 15, 2009

117. Agilidade não é Rapidez Tuesday, December 15, 2009

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

121. Código Limpo Tuesday, December 15, 2009

123. Test Driven Development Tuesday, December 15, 2009

125. 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

130. 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

131. 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

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

135. Produtividade Cowboy Proﬁssional Tuesday, December 15, 2009

136. 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

147. 237 Equipes 137 Finalizadas Tuesday, December 15, 2009

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

153. Pro ssionalismo Tuesday, December 15, 2009

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

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Ceara On Rails 2009