Onde mora a
produtividade
do Ruby on Rails?
Fabio Kung
fabio.kung@caelum.com.br
fabiokung @ twitter

Scaffold

Ruby

Dinamismo

“Skilled programmers can write
better programmers than they can
hire”
-- Giles Bowkett

Expressividade

Domain Specific Languages

10.days.ago

rufus-scheduler

rufus-scheduler
scheduler.in '20m' do
puts "go home"
end
scheduler.every '5m' do
puts "check blood pressure"
end

<div class="listitemchk">
<h3 class="smller">
<a href="URL_DO_PERFIL">QUEM_POSTOU</a>:
</h3>
<div class="para ">
TEXTO DO RECADO
<div class="selr">
...
</div>
</div>
</div>

<div class="listitemchk">
<h3 class="smller">
<a href="URL_DO_PERFIL">QUEM_POSTOU</a>:
</h3>
<div class="para ">
TEXTO DO RECADO
<div class="selr">
...
</div>
</div>
</div>
doc = Hpricot(texto)
doc / "div.listitemchk" / "h3.smller" / "a"
doc / "div.listitemchk" / "div.para"

User.select { |m| m.name == 'jon' && m.age == 21 }
"SELECT * FROM users WHERE users.name = 'jon' AND users.age = 21"

User.select { |m| m.name == 'jon' && m.age == 21 }
"SELECT * FROM users WHERE users.name = 'jon' AND users.age = 21"
User.select { |u| [1, 2, 3, 4].include? u.id }
# SELECT * FROM users WHERE users.id IN (1,2,3,4)
User.select { |u| u.friends.name =~ /bi/ }
# SELECT * FROM users LEFT OUTER JOIN ... WHERE friends.name ~ 'bi'

class Company < ActiveRecord::Base
has_many :jobs
validates_presence_of :name
validates_presence_of :contact_name
validates_presence_of :ddd, :phone
validates_uniqueness_of :cnpj
validates_uniqueness_of :razao_social
validates_numericality_of :ddd, :phone
validates_unchangeable :email
validates_unchangeable :cnpj
acts_as_authentic
end

Novos paradigmas

Erlang, Scala, ...

YAWS

MapReduce

Enumerable

Ecossistema

TATFT
(Test All The Fucking Time)

TDD
class PostTest < ActiveSupport::TestCase
def test_title
post = Post.new :title => "Post 1"
assert_equal "Post 1!", post.title
end
end

BDD
class PostTest < ActiveSupport::TestCase
def test_title_is_required
post = Post.new
assert ! post.valid?
end
end

Dúvidas?
Obrigado!
fabio.kung@caelum.com.br
http://fabiokung.com
twitter: fabiokung