Enecomp 2009

Ruby on Rails Tuesday, September 8, 2009

AkitaOnRails.com slideshare.net/akitaonrails Tuesday, September 8, 2009

2008 Tuesday, September 8, 2009

13 e 14 Outubro 2009 Tuesday, September 8, 2009

Tuesday, September 8, 2009

> 100 slides < 1 hora Tuesday, September 8, 2009

www.slideshare.net/akitaonrails fabio.akita@locaweb.com.br Tuesday, September 8, 2009

Ruby on Rails 2.3 Ruby 1.8 “Novo” Ruby 1.9 Tuesday, September 8, 2009

“Matz” 1993 Tuesday, September 8, 2009

“Prag Dave” 2001 Tuesday, September 8, 2009

“DHH” 2004 Tuesday, September 8, 2009

Charles Nutter 2006 Tuesday, September 8, 2009

“Tornar as coisas simples fáceis e as coisas complexas possíveis” Filosoﬁa Ruby Tuesday, September 8, 2009

Orientação a Objetos Tuesday, September 8, 2009

“Eu inventei o termo ‘orientação a objetos’, e posso lhes dizer que eu não estava pensando em C++.” Tuesday, September 8, 2009

Meta-programação Tuesday, September 8, 2009

Meta-apresentação Tuesday, September 8, 2009

Ruby on Rails Tuesday, September 8, 2009

Código que gera Código Convention over Configuration Don’t Repeat Yourself Extreme Programming Tuesday, September 8, 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, September 8, 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, September 8, 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, September 8, 2009

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 Tuesday, September 8, 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, September 8, 2009

“Beautiful Code” Tuesday, September 8, 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, September 8, 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, September 8, 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, September 8, 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, September 8, 2009

190 vs 40 Tuesday, September 8, 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, September 8, 2009

Ferramentas Ágeis Tuesday, September 8, 2009

Gitorious Repositórios Github Integração Integrity Contínua Cruise Control Capistrano Deployment Puppet Monitoramento New Relic Tuesday, September 8, 2009

Comunidade Tuesday, September 8, 2009

peepcode.com Geoffrey Tuesday, September 8, 2009

railsenvy.com Jason e Gregg Tuesday, September 8, 2009

railscasts.com Ryan Bates Tuesday, September 8, 2009

rubylearning.org Satish Talim Tuesday, September 8, 2009

rubyinside.com.br Peter Cooper Tuesday, September 8, 2009

O que dizem por aí ... Tuesday, September 8, 2009

Pouco usado Tuesday, September 8, 2009

Rails não Escala Tuesday, September 8, 2009

Blaine Cook http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter Tuesday, September 8, 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, September 8, 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, September 8, 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, September 8, 2009

Ruby é Lento Tuesday, September 8, 2009

x mais lento que C++ Tuesday, September 8, 2009

x mais lento que C++ 0 50 100 Python 2 150 Ruby 1.9 200 Perl JRuby Python 3 PHP Ruby 1.8.6 Tuesday, September 8, 2009

Homepage: 331 ms Tuesday, September 8, 2009

Homepage: 331 ms Total: 5.45 s Tuesday, September 8, 2009

Performance != Escalabilidade Tuesday, September 8, 2009

Outros Mitos? Tuesday, September 8, 2009

Mais Produtivo “Melhor” Anti-legado Tuesday, September 8, 2009

Agilidade Tuesday, September 8, 2009

Robert C. Martin Tuesday, September 8, 2009

“Uncle Bob” Tuesday, September 8, 2009

Código Limpo Tuesday, September 8, 2009

Test Driven Development Tuesday, September 8, 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, September 8, 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, September 8, 2009

Não é mais demorado? Tuesday, September 8, 2009

Cowboy Proﬁssional Tuesday, September 8, 2009

Cowboy Proﬁssional 70.00 52.50 Produtividade 35.00 17.50 0 1 2 3 4 5 6 7 8 9 10 11 12 Tempo Tuesday, September 8, 2009

237 Equipes 137 Finalizadas Tuesday, September 8, 2009

Empreendedorismo Código e “Forma” Ciclo de Vida de Projetos Comunidade Open Source Tuesday, September 8, 2009

Profissionalismo Tuesday, September 8, 2009

Obrigado! akitaonrails.com railssummit.com.br Tuesday, September 8, 2009

Enecomp 2009

by Fabio Akita on Sep 08, 2009

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Enecomp 2009 — Presentation Transcript