Desenvolvimento Ágil com Ruby on Rails

Desenvolvimento
Ágil com Ruby on
Rails
segunda-feira, 29 de abril de 13

http://bit.ly/agile-webdev-rails

"Programmers should
always be interested in
learning new languages,
preferably from an
unfamiliar paradigm"
"97Things Every Programmer Should Know"

Ruby on Rails é um
framework em Ruby

https://www.ruby-toolbox.com/categories/web_app_frameworks
Sinatra, Padrino,
Merb, Espresso

Conhecendo um pouco
de Ruby

Ruby From Other
Languages
http://bit.ly/ruby-from-other

Interpretado
#app.rb
puts “Meet2Brains”
$ ruby app.rb
Meet2Brains

Uso de Blocos
my_list = [1,2,3,4,5]
my_list.each do |item|
# deal with item
end

Tudo tem valor
x = 10
y = 11
z = if x < y
1
else
2
end
z # => 1

Tudo é objeto
10.times{ |n| puts n }

Tudo é objeto
10.class
=> Fixnum

Tudo é objeto
10.class
=> Fixnum
Fixnum.class
=> Class

Tudo é objeto
10.class
=> Fixnum
Fixnum.class
=> Class
Fixnum.ancestors
=> [Fixnum, Integer, Numeric,
Comparable, Object, Kernel,
BasicObject]

# This
1 + 2
# Is the same as this ...
1.+(2)
# Which is the same as this:
1.send "+", 2

Metaprogramação

class Car
def inspect
“Cheap car”
end
end

class Car
def inspect
“Cheap car”
end
end
other_car = Car.new
other_car.inspect # => “Cheap car”

class Car
def inspect
“Cheap car”
end
end
porsche = Car.new
porsche.inspect # => “Cheap car”
def porsche.inspect
“Expensive car”
end
porsche.inspect # => “Expensive car”
other_car = Car.new
other_car.inspect # => “Cheap car”

class Fixnum
def hours
self * 3600 # number of seconds/hour
end
alias hour hours
end
# 14 hours from 00:00 January 1st
Time.mktime(2006, 01, 01) + 14.hours
# => Sun Jan 01 14:00:00

class Fixnum
def hours
self * 3600 # number of seconds/hour
end
alias hour hours
end
# 14 hours from 00:00 January 1st
# => Sun Jan 01 14:00:00
# => Sun Jan 01 14:00:00

Time.now + 2.days
# => 2013-05-01 12:40:57 -0300
#Rails

Dica?

http://tryruby.org

RubyGems

Software Package

Autenticação
Paginação
Imagens
Tasks
Filas...

$ gem install rails

Ruby on Rails

Agil

MVC

Rails Philosophy

Don’t Repeat Yourself
(DRY)

Layouts, Views, Partials

# application.html.erb
<html>
<body>
<%= yield %>
</body>
</html

# application.html.erb
<html>
<body>
<%= yield %>
</body>
</html
# clientes/index.html.erb
<h1>Clientes</h1>
<table>
...
</table>

Helpers
FORMS, TAGS, HTML BLOCKS, SUPPORT,
FORMATS, ...

Helpers
FORMS, TAGS, HTML BLOCKS, SUPPORT,
FORMATS, ...
<%= form_for @article do |f| %>
<%= f.text_field :title %>
<%= f.text_area :body, size: "60x12" %>
<%= f.submit "Create" %>
<% end %>

Model - Scope

Model - Scope
@published = Post.where(published: true)

Model - Scope
class Post < ActiveRecord::Base
scope :published, where(published: true)
end

Model - Scope
class Post < ActiveRecord::Base
scope :published, where(published: true)
end
@published = Post.published

Convention over
Configuration (CoC)

1
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3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#config/routes.rb
resources :posts
#app/controllers/posts_controller.rb
class PostsController < ApplicationController
def index
@posts = Post.published
end
# ...
end
#app/views/posts/index.html.erb
<h1>Posts</h1>
<ul>
<%= render @posts %>
</ul>
#app/views/posts/_post.html.erb
<li><%= post.title %></li>

RESTful

resources
:photos

Migrations
Migrations are a convenient way for you to
alter your database in a structured and
organized manner

class CreateProducts < ActiveRecord::Migration
  def up
    create_table :products do |t|
      t.string :name
      t.text :description

      t.timestamps
    end
  end

  def down
    drop_table :products
  end
end

Testes
TDD, BDD

Extensível
Autenticação, paginação, manipulação/upload de imagens,
webservice, privilégios, pdf, csv, xml, json, ﬁlas,
monitoramento, database drivers, ...

Quem usa?

www.adena.com.br

http://rubyonrails.org/applications

Referências
http://bit.ly/ZV7NLZ

Desenvolvimento Ágil com Ruby on Rails

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