Ruby on Rails

AkitaOnRails.com

http://www.akitaonrails.com

http://www.locaweb.com.br/rails

1

Joel Spolsky

“Without understanding functional programming, you can't
invent MapReduce, the algorithm that makes Google so
massively scalable.”
“The Perils of JavaSchools” - Joel Spolsky - 29/12/2005
http://www.joelonsoftware.com/articles/ThePerilsofJavaSchools.html

“The terms Map and Reduce come from Lisp and
functional programming...”
“The Perils of JavaSchools” - Joel Spolsky - 29/12/2005
http://www.joelonsoftware.com/articles/ThePerilsofJavaSchools.html

“The very fact that Google invented MapReduce, and
Microsoft didn't, says something about why Microsoft is
still playing catch up.”
“The Perils of JavaSchools” - Joel Spolsky - 29/12/2005
http://www.joelonsoftware.com/articles/ThePerilsofJavaSchools.html

Codificadores
x
Desenvolvedores

“SOFT”WARE

AGILIDADE

Estamos “descobrindo” maneiras melhores
de desenvolver software na prática e
ajudando outros a desenvolver.

Big Design Up
Front

Big Design Up
Front

Escopo Fechado

Escopo Fechado

Faseamento em
Cascata

Faseamento em
Cascata

“Change Request”

“Change Request”

Ceticismo

Winston W. Royce - 1970

“I believe in this concept,
but the implementation
described above is risky
and invites failure.”
Winston W. Royce - 1970

“I believe in this concept,
but the implementation
described above is risky
and invites failure.”
Winston W. Royce - 1970

“I believe in this concept,
but the implementation
described above is risky
and invites failure.”
Winston W. Royce - 1970

“Cargo Cult”

2

“Matz”
1993
http://www.ruby-lang.org

“Prag Dave”
2001
http://www.rubycentral.com/book/
http://www.pragprog.com/titles/ruby3/programming-ruby-1-9

“DHH”
2004
http://www.rubyonrails.org
http://www.loudthinking.com

http://rubyonrails.org/screencasts

http://rubyonrails.org/screencasts

“Tornar as coisas simples
fáceis e as coisas
complexas possíveis”
Filosofia Ruby

http://www.levenez.com/lang/

Ruby on Rails

RUBY
http://guides.rails.info/

ActiveSupport
Rails
RUBY
http://guides.rails.info/

ActionController
ActionPack
ActionView
ActiveSupport
Rails
RUBY
http://guides.rails.info/

ActiveRecord
ActionController
ActionPack
ActionView
ActiveSupport
Rails
RUBY
http://guides.rails.info/

ActionMailer
ActiveRecord
ActionController
ActionPack
ActionView
ActiveSupport
Rails
RUBY
http://guides.rails.info/

ActiveResource ActionWebService
ActionMailer
ActiveRecord
ActionController
ActionPack
ActionView
ActiveSupport
Rails
RUBY
http://guides.rails.info/

RSpec
describe Product do
include ProductSpecHelper
before(:each) do
@product = Product.new
end
it \"should not be valid when empty\" do
@product.should_not be_valid
end
it \"should be valid when having correct information\" do
@product.attributes = valid_product_attributes
@product.should be_valid
end
end

RSpec
describe Product do
include ProductSpecHelper
before(:each) do
@product = Product.new
end
it \"should not be valid when empty\" do
rake spec
@product.should_not be_valid
end
it \"should be valid when having correct information\" do
@product.attributes = valid_product_attributes
@product.should be_valid
end
end

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

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

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

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

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? %>

Views HAML
#product-listing
=breadcrumbs(@taxon)
%br
=render :partial => \"shared/products.html.erb\",
:locals => {:products => @products, :taxon => @taxon}
-content_for :sidebar do
%td#shop-by-col(:valign => \"top\")
=render :partial => \"shared/taxonomies\"
=render :partial => 'shared/paginate',
:locals => {:collection => @products, :options => {}}
unless @products.empty?

Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
map.connect ':controller/service.wsdl', :action => 'wsdl'
map.resources :products,
:member => {:change_image => :post}
map.resources :addresses
map.resources :orders,
:has_many => [:line_items]
map.namespace :admin do |admin|
admin.resources :users
admin.resources :products
end
end

Rotas RESTFul
ActionController::Routing::Routes.draw do |map|
GET /products/new
map.connect ':controller/service.wsdl', :action => 'wsdl'
GET /products
map.resources :products,
POST /products
:member => {:change_image => :post}
map.resources :addresses
GET /products/1
map.resources :orders,
GET /products/1/edit
:has_many => [:line_items]
map.namespace PUT /products/1
:admin do |admin|
DESTROY /products/1
admin.resources :users
admin.resources :products
end
end

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

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

“Beautiful Code”

http://weblog.jamisbuck.org/2008/11/9/legos-play-doh-and-programming
http://weblog.jamisbuck.org/2008/11/29/recovering-from-enterprise-video-available

11 mil classes!
46 só de
Collections!
http://weblog.jamisbuck.org/2008/11/9/legos-play-doh-and-programming
http://weblog.jamisbuck.org/2008/11/29/recovering-from-enterprise-video-available

• Classes:
• Modules: • Array
• Enumerable • Hash
• Comparable • Set
• Sorted Set

1.400Classes:
•
classes
• Modules: • Array
• Enumerable • Hash
• Comparable 6 deSet
só •
Collections! Set
• Sorted

• Convention over Configuration
• Don’t Repeat Yourself
• You Ain’t Gonna Need It
• Automação
• Boas Práticas
• Código Bonito
• Ferramentas Simples

http://macromates.com
http://www.apple.com/macbook

3

Mitos
http://www.loudthinking.com/posts/29-the-rails-myths

Rails não Escala

FUD: http://www.techcrunch.com/2008/05/22/twitter-at-scale-will-it-work/

To put things into
perspective, though,
Friendster was written in Java
to start, and switched to
PHP. Myspace was written in
ColdFusion and transitioned
to ASP.NET.
When people run into
problems scaling sites they
often think that the language
is the problem, but I think it’s
Blaine Cook
rarely the case.
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter
http://www.akitaonrails.com/2008/6/17/chatting-with-blaine-cook-twitter

“The New York Times used Ruby on Rails to pull
together, analyze and display election results in
near real time on one of its busiest Web
traffic days ever. ”
http://www.computerworld.com.au/article/268003/ruby_rails_rolls_into_enterprise?fp=16&fpid=1
http://www.computerworld.com/action/article.do?
command=viewArticleBasic&articleId=9120778

“They serve up 23 million visitors a month. The conversion resulted in 20,000 lines
of Ruby code instead of 125,000 lines of Java code, and most importantly eased
the difficulty they had in maintaining it. Once complete, and optimized their site
is now faster than before. They also completed the rewrite in three months with
four developers.”
http://www.railsonwave.com/railsonwave/2008/6/4/yellowpages-com-migrates-to-rails
http://www.akitaonrails.com/2008/11/21/rails-podcast-brasil-qcon-special-john-straw-
yellowpages-com-and-matt-aimonetti-merb
http://www.rubyonrailsexamples.com/sites-on-rails/yellowpagescom-goes-ror/

http://www.techcrunch.com/2008/01/24/hulu-discusses-private-beta-suggests-public-
launch-time-frame/

http://www.blogblogs.com.br

Mitos

Deployment de
Rails é difícil

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

Apache + FastCGI
LightTPD + FastCGI
Litespeed + SAPI
Apache + Mongrel
Nginx + Mongrel
Nginx + Thin

http://phusion.nl
http://www.modrails.com/

gem install passenger
passenger-install-apache2-module
http://phusion.nl
http://www.modrails.com/

Mitos

Rails é mal
documentado

Geoffrey
http://www.peepcode.com

Jason e Gregg
http://railsenvy.com
http://envycasts.com

Ryan Bates
http://railscasts.com

Pratik Naik
http://guides.rails.info/

Satish Talim
http://rubylearning.org

Peter Cooper
http://rubyinside.com
http://railsinside.com
http://rubyflow.com
http://jrubyinside.com

_why
http://whytheluckysti.net/

http://www.amazon.com/s/ref=nb_ss_gw?url=search-alias%3Dstripbooks&field-keywords=ruby+rails&x=0&y=0

4

Open Source

Chris Wanstrath
http://github.com

http://rubyforge.org
http://gitorious.org

http://jruby.codehaus.org
http://www.macruby.org
http://www.ironruby.net
http://ruby.gemstone.com/

http://gettingreal.37signals.com/GR_por.php
http://aprendaaprogramar.rubyonrails.pro.br/
http://why.nomedojogo.com/
http://rubyonrails.pro.br

http://gettingreal.37signals.com/GR_por.php
http://aprendaaprogramar.rubyonrails.pro.br/
http://why.nomedojogo.com/
http://rubyonrails.pro.br

Conferências

http://www.confreaks.com/
http://www.akitaonrails.com/railsconf2008

http://www.locaweb.com.br/railssummit
http://www.akitaonrails.com/railssummit2008

Especialista de
uma coisa só é um
amador em todo o
resto.

Obrigado!
www.akitaonrails.com