Rails3 changesetsihower@gmail.com

2010/8/17

About Me• 張文鈿 a.k.a. ihower

• http://ihower.tw

• http://twitter.com/ihower

• Rails Developer since 2006

• The Organizer of Ruby Taiwan Community

• http://ruby.tw

• http://rubyconf.tw

Agenda• Bundler

• ActiveRecord: New Query API

• ActiveRecord: New Validation API

• Views: XSS, Block Helper and JavaScript

• I18n

• New Routing API

• New ActionMailer

• Metal

1. Bundlerhttp://ihower.tw/blog/archives/4464

Gemfile # 第二個參數可以指定版本 gem "rails", "3.0.0.rc"

# 如果 require 的檔名不同，可以加上 :require gem "sqlite3-ruby", :require => "sqlite3"

# 可以用 Git 當做來源，甚至可以指定 branch, tag 或 ref。 gem 'authlogic', :git => 'git://github.com/odorcicd/authlogic.git', :branch => 'rails3'

# 可以直接用電腦裡的其他目錄 gem "rails", :path => '/Users/ihower/github/rails'

# Group 功能可以讓特定環境才會載入 group :test do gem "rspec-rails", ">= 2.0.0.beta.8" gem "webrat" end

2. AR Query API

AR queries (1)method chaining

# Rails 2users = User.find(:all, :conditions => { :name => 'ihower' }, :limit => 10, :order => 'age')

# Rails 3users = User.where(:name => 'ihower').limit(20).order('age')

AR queries (2)Unify finders, named_scope, with_scope to Relation

# Rails 2users = Userusers = users.some_named_scope if params[:some]sort = params[:sort] || "id"conditions = {}

if params[:name] conditions = User.merge_conditions( conditions, { :name => params[:name] } ) end

if params[:age] conditions = User.merge_conditions( conditions, { :age => params[:age] } )end

find_conditions = { :conditions => conditions, :order => "#{sort} #{dir}" }sort = params[:sort] || "id"

users = users.find(:all, :conditions => conditions, :order => sort )

# Rails 3users = Userusers = users.some_scope if params[:some]users = users.where( :name => params[:name] ) if params[:name]users = users.where( :age => params[:age] ) if params[:age]users = users.order( params[:sort] || "id" )

AR queries (2)Unify finders, named_scope, with_scope to Relation

# Rails 3class Product < ActiveRecord::Base scope :discontinued, where(:discontinued => true) scope :cheaper_than, lambda { |price| where("price < ?", price) }

end

# Rails 3, prefer this way moreclass Product < ActiveRecord::Base

scope :discontinued, where(:discontinued => true) def self.cheaper_than(price) where("price < ?", price) end end

AR queries (3)Using class methods instead of scopes when you need lambda

3. AR Validation API

AR validation (1)# Rails 2class User < ActiveRecord::Base validates_presence_of :email validates_uniqueness_of :email validates_format_of :email, :with => /^[\w\d]+$/ :on => :create, :message => "is invalid" end

# Rails 3class User < ActiveRecord::Base validates :email, :presence => true, :uniqueness => true, :format => { :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i } end

http://asciicasts.com/episodes/211-validations-in-rails-3

AR validation (2)custom validator

# Rails 3class User < ActiveRecord::Base validates :email, :presence => true, :uniqueness => true, :email_format => true end

class EmailFormatValidator < ActiveModel::EachValidator def validate_each(object, attribute, value) unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i object.errors[attribute] << (options[:message] || "is not formatted properly") end end end

4. Views

Secure XSSRails3 will automatically escape any string that does not

originate from inside of Rails itself

# Rails2<%=h @person.title %>

# Rails3<%=@person.title %>

# unescape string<%= @person.title.html_safe %><%= raw @person.title %>

Unobtrusive JavaScript# Rails 2link_to_remote "Name", url_path# Rails 3link_to "Name", url_path, :remote => true

# Rails 2remote_form_for @article doend# Rails 3form_for @article, :remote => true doend

You can change rails.js to jQuery version

http://ihower.tw/blog/archives/3917

# Rails 2<% form_for @article do %>end

<% content_for :sidebar do %><% end %>

# Rails 3<%= form_for @article do %>end

<%= content_for :sidebar do %><% end %>

consistent <%= %>

consistent <%= %> (2)# Rails2<% my_helper do %> blah<% end %>

# Rails2 Helperdef my_helper concat("header") yield concat("footer")end

# ordef my_helper(&block) tmp = with_output_buffer(&block) concat("header #{tmp} footer")end

# Rails3<%= my_helper do %> blah<% end %>

# Rails3 Helperdef my_helper(&block) tmp = with_output_buffer(&block) "header #{tmp} footer"end

consistent <%= %> (3)

5. I18n

{{ }} becomes to %{}

6. Routing API

Routesnice DSL

# Rails 2map.resources :people, :member => { :dashboard => :get, :resend => :post, :upload => :put } do |people| people.resource :avatraend

# Rails 3resources :people do resource :avatar member do get :dashboard post :resend put :upload endend

7. ActionMailer

ActionMailer# Rails 2class UserMailer < ActionMailer::Base

def signup(user) recipients user.email from 'ihower@gmail.com' body :name => user.name subject "Signup" end

end

UserMailer.deliver_registration_confirmation(@user)

ActionMailer# Rails 3class UserMailer < ActionMailer::Base

default :from => "ihower@gmail.com" def signup(user) @name = user.name mail(:to => user.email, :subject => "Signup" ) end

end

UserMailer.registration_confirmation(@user).deliver

8. Metal

Removing Metal

• Use Rack middleware

• Use Rack endpoint in the router

• you can inherit ActionController::Metal to gain controller’s feature

Yehuda’s benchmarkrps2900 單純 Rack 極限2200 使用 config.middleware.use YourMiddleware2000 經過 Rails Route 之後1900 使用 ActionController::Metal 的最快速度1070 使用 ActionController::Base 的最快速度825 使用 ActionController::Base 加上 render :text765 使用 ActionController::Base 加上 render :template375 使用 ActionController::Base 加上 Template 跟 Layout

Thanks.More on http://ihower.tw/blog/archives/4590

andhttp://ihower.tw/rails3/