Semcomp de São Carlos

Tuesday, December 15, 2009

Ruby on Rails Tuesday, December 15, 2009

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

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

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

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

“Matz” 1993 Tuesday, December 15, 2009

“Prag Dave” 2001 Tuesday, December 15, 2009

“DHH” 2004 Tuesday, December 15, 2009

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

Charles Nutter 2006 Tuesday, December 15, 2009

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

Orientação a Objetos? Tuesday, December 15, 2009

Alan Kay Dan Ingalls Tuesday, December 15, 2009

Alan Kay Tuesday, December 15, 2009

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

Meta- programação Tuesday, December 15, 2009

Meta- apresentação Tuesday, December 15, 2009

Ruby on Rails Tuesday, December 15, 2009

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

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

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

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

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

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

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

“Beautiful Code” Tuesday, December 15, 2009

@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

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

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

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

190 vs 40 Tuesday, December 15, 2009

“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

Ferramentas Ágeis Tuesday, December 15, 2009

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

Comunidade Tuesday, December 15, 2009

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

Pouco usado Tuesday, December 15, 2009

Rails não Escala Tuesday, December 15, 2009

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

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

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

“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

Ruby é Lento Tuesday, December 15, 2009

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

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

Homepage: 331 ms Tuesday, December 15, 2009

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

Performance != Escalabilidade Tuesday, December 15, 2009

Outros Mitos? Tuesday, December 15, 2009

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

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

Agilidade Tuesday, December 15, 2009

Robert C. Martin Tuesday, December 15, 2009

Código Limpo Tuesday, December 15, 2009

Test Driven Development Tuesday, December 15, 2009

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

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

Não é mais demorado? Tuesday, December 15, 2009

Produtividade Cowboy Proﬁssional Tuesday, December 15, 2009

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

237 Equipes 137 Finalizadas Tuesday, December 15, 2009

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

Post hoc ergo propter hoc Tuesday, December 15, 2009

Pro ssionalismo Tuesday, December 15, 2009

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

Semcomp de São Carlos

by Fabio Akita on Dec 15, 2009

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Semcomp de São Carlos — Presentation Transcript