Ruby on Rails na Unip

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

“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 very fact that Google invented MapReduce, and
Microsoft didn't, says something about why Microsoft is
still playing catch up.”


Codificadores
x
Desenvolvedores

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

“I believe in this concept,
but the implementation
described above is risky
and invites failure.”

Winston W. Royce - 1970

“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

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

RUBY

http://guides.rails.info/

ActiveSupport
Rails

RUBY


ActionController
ActionPack
ActionView

ActiveSupport
Rails

RUBY


ActiveRecord
ActionController
ActionPack
ActionView

ActiveSupport
Rails

RUBY


ActionMailer
ActiveRecord
ActionController
ActionPack
ActionView

ActiveSupport
Rails

RUBY


ActiveResource ActionWebService

ActionMailer
ActiveRecord
ActionController
ActionPack
ActionView

ActiveSupport
Rails

RUBY


RSpec
describe Product do
include ProductSpecHelper

before(:each) do
@product = Product.new
end

it quot;should not be valid when emptyquot; do
@product.should_not be_valid
end

it quot;should be valid when having correct informationquot; 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 quot;should not be valid when emptyquot; do
rake spec
@product.should_not be_valid
end

it quot;should be valid when having correct informationquot; 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=quot;product-listingquot;>
<%= breadcrumbs(@taxon) %>
<br/>
<%= render :partial => quot;shared/products.html.erbquot;,
:locals => {:products => @products, :taxon => @taxon } %>
</div>

<% content_for :sidebar do %>
<td id=quot;shop-by-colquot; valign=quot;topquot;>
<%= render :partial => quot;shared/taxonomiesquot; %>
</td>
<% end %>

<%= render :partial => 'shared/paginate',
:locals => {:collection => @products, :options => {}}
unless @products.empty? %>

Views HAML

#product-listing
=breadcrumbs(@taxon)
%br
=render :partial => quot;shared/products.html.erbquot;,
:locals => {:products => @products, :taxon => @taxon}

-content_for :sidebar do
%td#shop-by-col(:valign => quot;topquot;)
=render :partial => quot;shared/taxonomiesquot;

=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
t.remove :type
end
rename_table :configurations, :app_configurations
end
end

Migrations

class RenameAppConfiguration < ActiveRecord::Migration
def self.up
rename_table :app_configurations, :configurations
t.string :type
end
rake db:migrate
end

def self.down
t.remove :type
end
rename_table :configurations, :app_configurations
end
end

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

Mitos

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

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/

Deployment de
Rails é difícil

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/

Geoffrey
http://www.peepcode.com

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

Ryan Bates
http://railscasts.com

Pratik Naik

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%3Dstripbooksﬁeld-keywords=ruby+railsx=0y=0

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://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

Ruby on Rails na Unip

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