reading Rails 3 Release Note (1:Upgrading to 7:Action Pack)

routing 重要。
色々萌える。escaping by default はやっとか！って感じだけど。

sources

• en: http://guides.rails.info/3_0_release_notes.html
• ja: http://blog.bluemoderns.com/articles/2010/02/07/ruby-on-rails-3-1

more infos

• http://guides.rails.info/ updating one by one to reflect the changes in Rails 3
  • guides.rails.info: edge
  • guides.rubyonrails.org: stable version

Intro

• RESTful declaration router
• AR chainable query lang built on top of relational algebra
  • relational algebra
• unobtrusive js driver for jQ and more coming
• Bundler

Upgrading to Rails 3

• Application Object
  • for supporting running multiple app in the same process
  • has specific config
  • defined in config/application.rb
• managing gems
  • use bundler and Gemfile
  • config.gem has gone
  • rails_upgrade offers generating Gemfile based on config.gem
• use plugin for update: http://github.com/rails/rails_upgrade
  • http://omgbloglol.com/post/364624593/rails-upgrade-is-now-an-official-plugin

Creating Rails 3 app

• Gemfile
  • http://github.com/carlhuda/bundler
• rails my app --edge
  • bundle straight from git repp, living on the edge

Architectural Change

• six major changes
• 1. Railties
• 2. core components are decoupled
  • rails core components are now using the same API that you can use for developing plugins
  • any components, including core, are replaceable (like DataMapper or Sequel)
  • more info: http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/
• 3. Active Model abstraction
  • untied AR from ActionPack
  • all ORM need to implement Active Model interface to work with Action Pack
  • more: http://yehudakatz.com/2010/01/10/activemodel-make-any-ruby-object-feel-like-activerecord/
• 4. Controller abstraction
  • Abstruction Controller, a base super class
  • http://yehudakatz.com/2009/06/11/rails-edge-architecture/
• 5. Arel Integration
  • Active Relation
  • underpinnings or AR and required for Rails
  • provides SQL abstraction and the relation functionality in AR
• 6. Mail Extraction
  • Mail gem: http://github.com/mikel/mail
  • more: http://lindsaar.net/2010/1/26/new-actionmailer-api-in-rails-3

Internationalization

• i18n behavior can be added to any object
  • like a ActiveModel::Translation, ActiveModel::Validations
  • errors.messages feedback, and the form
  • more: http://blog.plataformatec.com.br/2010/02/rails-3-i18n-changes/

Railties

• each app now has its own namespace
• anything under Rails.root/app is now added to the load path
  • you can make app/observers/user_observer.rb
• Rails.config, Rails wide configuration option
• generators
  • allow you to override the templates by placing a copy at RAILS_ROOT/lib/templates
• rake
  • rake routes CONTROLLER=x show the routes for one controller
• deprecated
  • RAILS_ROOT -> Rails.root
  • RAILS_ENV -> Rails.env
  • RAILS_DEFAULT_LOGGER -> Rails.logger

Action Pack

Action Controller

• application_controller.rb
  • now has protect_from_forgery on by default
• cookie / session
  • some settings moved to initializers/*.rb
    • cookie_verifier_secret
    • session_store
• cookies.secure allowing you to set encrypted in cookie with cookie.secure[:key] => value
• cookies.permanent, cookie.permanent[:key] => value
• can pass :notice => flash_msg, :alert => flash_msg to the format object call inside a respond_to block. flash[] still works
• more
  • http://www.engineyard.com/blog/2010/render-options-in-rails-3/
  • http://weblog.rubyonrails.org/2009/8/31/three-reasons-love-responder

Action View

• escaping by default
  • no longer need to call h(string)
  • use raw(string) to unescape
• helpers now output HTML 5 by default
• form label helper now pulls values from i18n
  • select label on should now be :en.helpers.select
• no longer need to place '-' sign on ERb
• added as new
  • grouped_collection_select helper
  • content_for? allowing you to check before rendering

Action Pack / Action Dispatch

• provides a new & cleaner implementation for routing
• Rails router is now rack_mount with DSL on top
• constraints method allowing you to guard routes with constraints
• root method as a short cut for match '/', :to=>path
• map still works but will be removed at 3.1
• more
  • http://yehudakatz.com/2009/12/26/the-rails-3-router-rack-it-up/
  • http://rizwanreza.com/2009/12/20/revamped-routes-in-rails-3
  • http://yehudakatz.com/2009/12/20/generic-actions-in-rails-3/

# former
ActionController::Routing::Routes.draw do |map|
  map.resources :posts
end

# now
AppName::Application.routes do
  resources :posts
end

# and scope
#  below gives you the edit action with /es/projeto/1/cambiar
scope 'es' do
  resources :projects, :path_names => { :edit => ''cambiar' }, :as => 'projeto' 
end

# you can pass optional segments
#  each parenthesize segment is optional
'/:controller(/:action(/:id))(.:format)

# routes can be expressed via block
controller :home {
  match '/:action'
}