Web Expo Forum

Ruby on Rails

Wednesday, March 18, 2009

AkitaOnRails.com

www.slideshare.net/akitaonrails


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



Codificadores
x
Desenvolvedores


Qual foi o concurso?

Qual foi o prêmio?


Martin Fowler


Agile


AGILIDADE


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


Big Design Up Front

“Waterfall” (Cascata)

Escopo Fechado

“Change Requests”


Ceticismo


Winston W. Royce - 1970

“Eu acredito neste conceito
mas a implementação descrita
acima é arriscada e convida
falhas.”

Winston W. Royce - 1970

“Cargo Cult”


“SOFT”WARE


“Matz”

1993

“Prag Dave”

2001

“DHH”

2004

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


RUBY


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
@product.should_not be_valid spec
rake
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

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

PUT /products/1
map.namespace :admin do |admin|
admin.resources :users
DESTROY /products/1
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

rake db:migrate
end
end

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


“Beautiful Code”


11 mil classes!

46 só de
Collections!


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


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


• Convention over Conﬁguration
• Don’t Repeat Yourself
• You Ain’t Gonna Need It
• Boas Práticas
• Escalabilidade
• Segurança
• Automação


Mitos


Rails não Escala


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
rarely the case.
Blaine Cook

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


“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


Deployment de
Rails é difícil


Apache + FastCGI

LightTPD + FastCGI

Litespeed + SAPI

Apache + Mongrel

Nginx + Mongrel

Nginx + Thin


gem install passenger
passenger-install-apache2-module


Rails é mal
documentado


Geoffrey

Jason e Gregg

Pratik Naik

Satish Talim

Peter Cooper

_why

Ryan Bates

Open Source


Chris Wanstrath

Conferências


One more thing ...


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


Obrigado!
www.akitaonrails.com


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