Ruby on Rails
Introduction
Sunday, March 22, 2009

Ruby
Sunday, March 22, 2009

Ruby successfully
combines Smalltalk's
conceptual elegance,
Phython's ease of use
and learning, and Perl's
pragmatism
Sunday, March 22, 2009

Ruby is Highly Dynamic
• Uses dynamic typing (vs. static)
• Full support for introspection
• Support for method redefinition
• Create your own domain-specific languages
• Modules vs. multiple inheritance
• method_missing, etc...
Sunday, March 22, 2009

puts \"upper\".upcase
Sunday, March 22, 2009

5.times do
puts \"Ruby Rocks!\"
end
Sunday, March 22, 2009

class Greeter
def initialize(greeting)
@greeting = greeting
end
def salute(name = \"you\")
puts \"#{@greeting} #{name}!\"
end
end
Sunday, March 22, 2009

next_month = Time.now +
1.month
Sunday, March 22, 2009

def thrice
yield(1)
yield(2)
yield(3)
end
# Output \"Blocks are cool!\" three
times with the count
thrice do |i|
puts \"#{i}: Blocks are cool!\"
end
Sunday, March 22, 2009

nil.is_a? Object
Class.is_a? Object
Sunday, March 22, 2009

Rails
Sunday, March 22, 2009

MVC
Sunday, March 22, 2009

Sunday, March 22, 2009

ActiveRecord
Models
Sunday, March 22, 2009

Sunday, March 22, 2009

Post.find(3)
Post.find(1..10, :order => ‘title’)
Post.first
Post.all
Post.count
Post.create(:title => ‘Foobar’)
Post.find_by_title(‘Foobar’)
Post.destroy(5)
Sunday, March 22, 2009

post = Post.find(27)
post.name
post.body
post.created_at
post.title = ‘dance’
post.save
post.destroy
Sunday, March 22, 2009

Post.without_title.first
Post.first.user
Sunday, March 22, 2009

ActionController
Controller
Sunday, March 22, 2009

• Routing
• Session handeling, security
• Request Forgery protection
• Exception Handling
Sunday, March 22, 2009

#GET http://localhost:3000/posts/7/edit
Sunday, March 22, 2009

#GET http://localhost:3000/posts/7/edit
PostController
Sunday, March 22, 2009

#GET http://localhost:3000/posts/7/edit
PostController action: edit
Sunday, March 22, 2009

#GET http://localhost:3000/posts/7/edit
PostController params[:id] = 7 action: edit
Sunday, March 22, 2009

REST
#GET /posts
#GET /posts/1
#GET /post/1/edit
#GET /post/new
#POST /posts
#PUT /posts/1
#DELETE /posts/1
Sunday, March 22, 2009

Sunday, March 22, 2009

ActionView
Views
Sunday, March 22, 2009

View
Sunday, March 22, 2009

Helper
Sunday, March 22, 2009

DRY
Don’t repeat yourself
Sunday, March 22, 2009

Modularity
/lib
Sunday, March 22, 2009

Sunday, March 22, 2009

class Video < ActiveRecord::Base
acts_as_featured
end
User.featurable? # => false
Video.featurable? # => true
Video.first.feature!
Sunday, March 22, 2009

Gems and Plugins
Sunday, March 22, 2009

acts_as_commentable
acts_as_taggable
acts_as_list
will_paginate
default_value_for
Sunday, March 22, 2009

Authlogic
Sunday, March 22, 2009

Paperclip
Sunday, March 22, 2009

HAML
Sunday, March 22, 2009

Thx!
Give me Q, I’ll give you A.
Sunday, March 22, 2009