check_link_down() {
  return 1;
}

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<string>Microsoft YaHei</string>

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require File.dirname(__FILE__) + '/../test_helper'      
     
class UserTest < Test::Unit::TestCase      
  fixtures :users      
     
  def test_full_name_without_middle_initial      
    user = User.new(:first_name => 'John', :last_name => 'Doe')      
    assert_equal 'John Doe', user.full_name      
  end      
     
  def test_full_name_with_middle_initial      
    user = User.new(:first_name => 'John', :middle_initial => 'H', :last_name => 'Doe')      
    assert_equal 'John H. Doe', user.full_name      
  end      
     
  def test_full_name_with_blank_middle_initial      
    user = User.new(:first_name => 'John', :middle_initial => '', :last_name => 'Doe')      
    assert_equal 'John Doe', user.full_name      
  end      
end

# user_test.rb
def test_full_name
  assert_equal 'John Doe', full_name('John', nil, 'Doe'), "nil middle initial"
  assert_equal 'John H. Doe', full_name('John', 'H', 'Doe'), "H middle initial"
  assert_equal 'John Doe', full_name('John', '', 'Doe'), "blank middle initial"
end

def full_name(first, middle, last)
  User.new(:first_name => first, :middle_initial => middle, :last_name => last).full_name
end

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require File.dirname(__FILE__) + '/../test_helper'

class UserTest < Test::Unit::TestCase
  fixtures :users
  
  def test_full_name_without_middle_initial
    user = User.new(:first_name => 'John', :last_name => 'Doe')
    assert_equal 'John Doe', user.full_name
  end
  
  def test_full_name_with_middle_initial
    user = User.new(:first_name => 'John', :middle_initial => 'H', :last_name => 'Doe')
    assert_equal 'John H. Doe', user.full_name  
  end
  
  def test_full_name_with_blank_middle_initial
    user = User.new(:first_name => 'John', :middle_initial => '', :last_name => 'Doe')
    assert_equal 'John Doe', user.full_name
  end
end

class User < ActiveRecord::Base      
  def full_name      
    name = first_name + " "   
    name += "#{middle_initial}. " unless middle_initial.nil?      
    name += last_name      
    name      
  end      
end

class User < ActiveRecord::Base
  def full_name
    [first_name, middle_initial_with_period, last_name].compact.join(' ')
  end
  
  def middle_initial_with_period
    "#{middle_initial}." unless middle_initial.blank?
  end
end

[first_name, middle_initial_with_period, last_name].reject{ |i| i.blank? }.compact.join(' ')
[first_name, middle_initial_with_period, last_name].reject(&:blank?) * ' '

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Name:   
<%= @user.first_name %>   
<%= "#{@user.middle_initial}." unless @user.middle_initial.nil? %>   
<%= @user.last_name %>  

class User < ActiveRecord::Base   
  def full_name   
    name = first_name + " "
    name += "#{middle_initial}. " unless middle_initial.nil?   
    name += last_name   
    name   
  end   
end 

Name:   
<%= @user.full_name %> 

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Processing LoginController#save (for 127.0.0.1 at 2008-04-08 13:53:22) [POST]
  Session ID: b40f205b38bd05382dc8ef2f362f5d5b
  Parameters: {"user"=>{"password_confirmation"=>"aaaaaa111", "login_name"=>"sora", "display_name"=>"Sora", "password"=>"aaaaaa111"}, "commit"=>"注册", "action"=>"save", "controller"=>"login"}
  User Columns (0.054099)   SHOW FIELDS FROM users
  SQL (0.002521)   SELECT count(*) AS count_all FROM users 
  SQL (0.000291)   BEGIN
  SQL (0.125573)   INSERT INTO users (`content_type`, `pic_name`, `salt`, `hashed_password`, `topics_count`, `personality`, `im`, `login_name`, `note`, `comments_count`, `display_name`, `data`, `email`) VALUES(NULL, NULL, '-6162285980.0824992721363479', 'afac1194f166bcb791bdabb32139edbf25c179ab', 0, NULL, NULL, 'sora', NULL, 0, 'Sora', NULL, NULL)
  SQL (0.049647)   COMMIT
Redirected to http://localhost:3000/
Completed in 0.35052 (2 reqs/sec) | DB: 0.23213 (66%) | 302 Found [http://localhost/login/save]

class ApplicationController < ActionController::Base   
  filter_parameter_logging "password"   
end

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<!-- layouts/application.rhtml -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"  
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">   
<html>   
  <head>   
    <title>Todo List</title>   
    <%= stylesheet_link_tag 'application' %>   
    <%= yield :head %>   
  </head>   
  <body>   
    <div id="container">   
      <h1>Todo List</h1>   
      <%= yield %>   
    </div>   
  </body>   
</html>

<!-- projects/index.rhtml -->
<% content_for :head do %>   
  <%= stylesheet_link_tag 'projects' %>   
<% end %>

<h2>Projects</h2>   
<ul>   
  <% for project in @projects %>   
    <li><%= project.name %></li>   
  <% end %>
</ul>

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<!-- views/projects/index.rhtml -->
<h2>Projects</h2>
<ul>
<% for project in @projects %>
  <li><%= project.name %></li>
<% end %>
</ul>

<!-- views/layouts/application.rhtml -->
<h1>Global Layouts</h1>
<%= yield %>

<!-- views/layouts/projects.rhtml -->
<h1>Controller Layouts</h1>
<%= yield %>

class ProjectsController < ApplicationController   
  layout "admin"  
  
  def index    
    @projects = Project.find(:all)   
  end   
end

class ProjectsController <　ApplicationController   
  layout :user_layout   
  
  def index   
    @projects = Project.find(:all)   
  end   
  
  protected  
  
  def user_layout   
    if current_user.admin?   
      "admin"  
    else  
      "application"  
    end   
  end   
end

class ProjectsController <　ApplicationController   
  def index   
    @projects = Project.find(:all)   
    render :layout => 'projects'  
  end    
end

class ProjectsController <　ApplicationController   
  def index   
    @projects = Project.find(:all)   
    render :layout => false 
  end    
end

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groups = posts.group_by { |post| post.author_id }
groups = posts.group_by(&:author_id)

class Symbol   
  # Turns the symbol into a simple proc, which is especially useful for enumerations. Examples:   
  #   
  #   # The same as people.collect { |p| p.name }   
  #   people.collect(&:name)   
  #   
  #   # The same as people.select { |p| p.manager? }.collect { |p| p.salary }   
  #   people.select(&:manager?).collect(&:salary)   
  def to_proc   
    Proc.new { |*args| args.shift.__send__(self, *args) }   
  end   
end  

projects = Project.find(:all)
projects.collect { |p| p.name }
# => ["Rails Projects", "Housework"]
projects.collect(&:name)
# => ["Rails Projects", "Housework"]
projects.collect(&:name).collect(&:downcase)
# => ["rails projects", "housework"]
projects.all?(&:valid?)
# => true
projects.any?(&:valid?)
# => true

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Task.find_all_by_complete(false, :limit => 20)

# model/task.rb   
belongs_to :project   
  
def self.find_incomplete(options = {})   
  with_scope :find => options do  
    find_all_by_complete(false, :order => 'created_at DESC')   
  end       
end    

# task_controller.rb  
def index   
  @tasks = Task.find_incomplete :limit => 20  
end     

# project_controller.rb 
def show
  @project = Project.find(params[:id])
  @tasks = @project.tasks.find_incomplete :limit => 20  
end

def index   
  @tasks = Task.find_incomplete(:limit => 20, :order => 'created_at')
end  

# model/task.rb
def self.find_incomplete(options = {})
  find_all_by_complete(false, {:order => 'created_at DESC'}.merge(options))
end

# model/task.rb
def self.find_incomplete(options = {})
  find_all_by_complete(false, options.reverse_merge(:order => 'created_at DESC'))
end

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# tasks_controller.rb
def index
  @tasks = Task.find_incomplete
end

# models/task.rb
def self.find_incomplete
  find_all_by_complete(false, :order => 'created_at DESC')
end

# projects_controller.rb
def show
  @project = Project.find(params[:id])
  @tasks = @project.tasks.find_incomplete
end

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# project.rb
has_many :tasks

# task.rb
belongs_to :project

# projects_controller.rb
def show
  @project = Project.find(params[:id])
  @tasks = Task.find(:all, :conditions => [ 'project_id = ? AND complete = ?', @project.id, false ])
end

@tasks = @project.tasks.find_all_by_complete(false)

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@tasks = Task.find(:all, :conditions => [ 'complete = ?', false ])
@task = Task.find(:first, :conditions => [ 'complete = ?', false ], :order => 'created_at DESC')

@tasks = Task.find_all_by_complete(false)
@task = Task.find_by_complete(false, :order => 'created_at DESC')

Task.find(:all, :conditions => [ 'complete = ? AND category_id = ?', false, 1 ])
Task.find_all_by_complete_and_category_id(false, 1)

def attribute_condition(argument)   
  case argument   
    when nil   then "IS ?"  
    when Array then "IN (?)"  
    when Range then "BETWEEN ? AND ?"  
    else            "= ?"  
  end  
end 

User.find_all_by_city_and_age([ 'Shanghai', 'Beijing' ], 18..30)

Book.find_by_title('title', :conditions => ['price > ?', price]) 

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User.find(session[:user_id])

@current_user ||= User.find(session[:user_id])

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product = Product.new
Product.expects(:find).with(1).returns(product)

Class A
  Private
  Def private_method
   #….
  end
end

a = A.new
a.send(“private_method”)

module ActiveSupport 
  module CoreExtensions     
    module Hash 
      module ReverseMerge
        def reverse_merge(other_hash)
          other_hash.merge(self)
        end
      end
    end
  end
end

class Hash #:nodoc:
  include ActiveSupport::CoreExtensions::Hash::ReverseMerge
end

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