Repensando o Desenvolvimento Web com Rails

Repensando o Desenvolvimento Web com
Ruby on Rails
segunda-feira, 21 de setembro de 2009

Rails


Comunidade


Filosoﬁa


DanteRegis.com
@danteregis

Admin de Redes - TJ/SE


DanteRegis.com
@danteregis

Admin de Redes - TJ/SE

http://slideshare.net/danteregis


Você não vai aprender
Ruby on Rails aqui


framework


David Heinemeier Hansson
2004


37signals


1400+ desenvolvedores


http://rubyonrails.com


jul/2004 0.5
dez/2005 1.0
mar/2006 1.1
jan/2007 1.2
dez/2007 2.0
jun/2008 2.1
nov/2008 2.2
mar/2009 2.3
algum dia (em 2009?) 3.0


Empregos
(fonte: indeed.com)


MVC


opiniated


eXtreme Programming


TDD


REST


modularização


DRY


Convention
over
Conﬁguration


KISS


script/console


Model


Model
id: integer

name: string

price: ﬂoat

category_id: integer

stock: integer

created_at: datetime

updated_at: datetime


Model
id: integer

name: string
x = Product.new
price: ﬂoat


stock: integer




Model
id: integer

name: string
x = Product.new
price: ﬂoat x.name = "Pão Jacó"

stock: integer




Model
id: integer

name: string
x = Product.new
category_id: integer x.stock = "100
stock: integer




Model
id: integer

name: string
x = Product.new
stock: integer x.price = 0.15



Model
id: integer

name: string
x = Product.new
stock: integer x.price = 0.15
created_at: datetime x.save


Model

INSERT INTO `products` COLUMNS (`name`, `price`,
`stock`) VALUES ("Pão Jaco", 0.15, 100);


Model

Product.first


Model

Product.first

Product.find_all_by_category_id(10)


Model

Product.first


Product.find_or_create_by_name("Margarina")


Model

Product.first



Product.count


Model

Product.first



Product.count

Product.average('price')


validations


associations


instance methods


Model

class Product < ActiveRecord::Base

end


Model

end

Model
belongs_to :category

end

Model
validates_presence_of :name

end

Model
validates_numericality_of :stock

end

Model
validates_numericality_of :stock

def consume!
stock -= 1
save
end

end

p = Product.new(:stock => "xxxxx")


p.save


p.save
#=> false


p = Product.first
p.category
p.category.name = "Mudei o nome"
p.category.save


has_many


class Category < ActiveRecord::Base
has_many :products
end


cat.products
cat.products.new
cat.products.first


named scope


named_scope :low_stock, :conditions => ['stock <= 10']
end


Product.low_stock
#=> [.....]


Product.low_stock
#=> [.....]

category.products.low_stock
#=> [...]


SQL?


migrations


controle de versão


do banco de dados!


sem SQL!


class AddQuantityToCartProduct < ActiveRecord::Migration


def self.up
add_column :cart_products, :quantity, :integer
end


def self.up
add_column :cart_products, :quantity, :integer
end

def self.down
drop_column :cart_products, :quantity
end
end


com SQL!


> 90%
experiência pessoal


ActionController


session


render


ﬁlters


class ApplicationController < ActionController::Base
before_filter :check_login

def check_login
render :text => "acesso negado!"
end
end


ﬂash


flash[:notice] = "Você logou no sistema"


cookies


respond_to


ActionView


erb


haml


form_tag
form_for


<div>
<span><%= flash[:notice] %></span>
</div>
<div>
<% form_tag do %>
<p>
Usuário: <%= text_field_tag 'username' %>
</p>
<p>
Senha: <%= password_field_tag 'password' %>
</p>
<p>
<%= submit_tag 'Entrar' %>
</p>
<% end %>
</div>


Tempo para falar mal
de certas “soluções”


Fim do tempo para
falar mal de certas
“soluções”


RailsConf
http://railsconf.com


Rails Summit Latin
America
http://railssummit.com.br


13 e 14 de outubro
São Paulo/SP


Aldo França

Great Blogs ‘n People


Akita on Rails
http://akitaonrails.com


Carlos Brando
http://nomedojogo.com


Ozéias Sant’ana
http://railsbox.org


Bruno Miranda
http://brunomiranda.com


Ruby Onda
http://rubyonda.com


Nando Vieira
http://simplesideias.com.br


PeepCode
http://peepcode.com


RailsCasts
http://railscasts.com


http://slideshare.net/danteregis


dante@danteregis.com


Repensando o Desenvolvimento Web com Rails

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