Rails3学习笔记一，中秋假期

好久没有写代码了，手痒得很。面对即将到来的长假，打算把Rails3好好的学习一把，鉴于自己Rails2也是菜鸟水准，首先端正态度，好好学习，天天向上。其次学习方法论依旧是战争中学习战争，先拿公司的一个内部项目开刀。

废话不说，

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Terminal＝》ruby -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]

OK，符合Rails3的要求，更新Gems。。。。。

首先看看rails命令的帮助 rails -h，看看都有什么

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Usage:
  rails new APP_PATH [options]
  -J, [--skip-prototype]      # Skip Prototype files
  -T, [--skip-test-unit]      # Skip Test::Unit files

额额，Prototype换成我更熟悉的Jquery，Test::Unit换成Rspec，好就这么办

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rails new Capricorn -TJ
mate .

代码生成完毕，看了一下public/javascripts/下面的controls.js，dragdrop.js，effects.js，prototype.js是没有的；同时test目录也是没有的。

第二件事情，处理Gemfile，这个比较好理解，就是Ruby的Maven

gem 'unicorn'
gem 'haml-rails'
gem 'jquery-rails'
group :development, :test do
  gem "rspec-rails", ">= 2.0.0.beta.22"
  gem 'autotest'
  gem 'rails3-generators'
  gem 'factory_girl_rails'
  gem 'webrat'
end

unicorn是类似Mongrel的一个东东，特点在于socket，以及kill -USR2 master_pid master的类似Nginx的启动方式让我很心仪。
haml-rails和jquery-rails是从rails3-generators分离出来的，针对Rails3和Haml以及Jquery的特方便集成。
rspec-rails就不用说了。
autotest会自动监视你的代码的改动，自动运行测试，所以你只要Command＋t一个Terminal窗口就好。
rails3-generators的存在就是为了factory_girl_rails，后者是替换Rails3自带的fixtures的。
webrat也没什么好说的。

运行

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bundle install

配置依赖

安装rspec

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rails g rspec:install
{
      create  .rspec
      create  spec
      create  spec/spec_helper.rb
      create  autotest
      create  autotest/discover.rb
}

安装Jquery

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rails g jquery:install
{
      remove  public/javascripts/controls.js
      remove  public/javascripts/dragdrop.js
      remove  public/javascripts/effects.js
      remove  public/javascripts/prototype.js
      create  public/javascripts/jquery.min.js
      create  public/javascripts/jquery.js
      create  public/javascripts/rails.js
}

配置factory_girl，修改application.rb，添加

config.generators do |g|
  g.fixture_replacement :factory_girl, :dir => "spec/factories"
end

修改rspec_helper.rb，替换

config.fixture_path = "#{::Rails.root}/spec/factories"

接下来，该干真格的了，先干用户登录模块

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rails g model User login:string name:string email:string crypted_password:string salt:string

查看输出结果为

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      invoke  active_record
      create    db/migrate/20100924033208_create_users.rb
      create    app/models/user.rb
      invoke    rspec
      create      spec/models/user_spec.rb
      invoke      factory_girl
      create        spec/factories/users.rb

额额，从结果来看，Rspec和Factory_girl是配置OK的。
Java的TDD经验告诉我，先从user_spec.rb下手。额额，Ruby代码写起来比较不给力啊，千言万语不知从何说起，TMD先用JAVA经验往上套吧，再看看别人的代码是怎么写的，能抄就抄，活人不能让尿憋死，罗马也不是一天就能建起来的，慢慢来。

  describe 'being created' do
    before do
      @user = nil
      @creating_user = lambda do
        @user = create_user
      end
    end

    it 'increments User#count' do
      @creating_user.should change(User, :count).by(1)
    end
  end

  protected

  def create_user(options = {})
    u = User.new({ :login => 'PenG', :email => '[email protected]', :password => 'peng82', :password_confirmation => 'peng82' }.merge(options))
    u.save! if u.valid?
    u
  end

先这样，运行一下看看再说

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autotest

额额，找不到Users，哦，忘了rake db:migrate和rake db:test:prepare。连续两次Control＋c中断autotest，再运行

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rake db:migrate
rake db:test:prepare
autotest

哦了！

在做一些老俗套的事情

  it 'requires login' do
    lambda do
      create_user(:login => nil).should_not be_valid
    end.should_not change(User, :count)
  end

  describe 'allows legitimate logins:' do
    ['123', '1234567890_234567890_234567890_234567890', 
      '[email protected]'].each do |login_str|
      it "'#{login_str}'" do
        lambda do
          u = create_user(:login => login_str)
          u.errors[:login].should be_empty
        end.should change(User, :count).by(1)
      end
    end
  end

  describe 'disallows illegitimate logins:' do
    ['12', '1234567890_234567890_234567890_234567890_', "tab\t", "newline\n",
      "Iñtërnâtiônàlizætiøn hasn't happened to ruby 1.8 yet", 
      'semicolon;', 'quote"', 'tick\'', 'backtick`', 'percent%', 'plus+', 'space '].each do |login_str|
      it "'#{login_str}'" do
        lambda do
          u = create_user(:login => login_str)
          u.errors[:login].should_not be_empty
        end.should_not change(User, :count)
      end
    end
  end

  it 'requires password' do
    lambda do
      u = create_user(:password => nil)
      u.should_not be_valid
    end.should_not change(User, :count)
  end

  it 'requires password confirmation' do
    lambda do
      u = create_user(:password_confirmation => nil)
      u.should_not be_valid
    end.should_not change(User, :count)
  end

  it 'requires email' do
    lambda do
      u = create_user(:email => nil)
      u.should_not be_valid
    end.should_not change(User, :count)
  end

  describe 'allows legitimate emails:' do
    ['[email protected]', '[email protected]', '[email protected]', '[email protected]',
      '[email protected]', '1234567890-234567890-234567890-234567890-234567890-234567890-234567890-234567890-234567890@gmail.com',
      '[email protected]', 'uucp%[email protected]', '[email protected]',
      '[email protected]'].each do |email_str|
      it "'#{email_str}'" do
        lambda do
          u = create_user(:email => email_str)
          u.errors[:email].should be_empty
        end.should change(User, :count).by(1)
      end
    end
  end
  
  describe 'disallows illegitimate emails' do
    ['[email protected]', '[email protected]', '[email protected]', '[email protected]',
      'Iñtërnâtiônàlizætiø[email protected]', 'need.domain.and.tld@de', "tab\t", "newline\n",
      '[email protected]', '1234567890-234567890-234567890-234567890-234567890-234567890-234567890-234567890-234567890@gmail2.com',
      '[email protected]', 'semicolon;@gmail.com', 'quote"@gmail.com', 'tick\'@gmail.com', 'backtick`@gmail.com', 'space @gmail.com', 
      'bracket<@gmail.com', 'bracket>@gmail.com'].each do |email_str|
      it "'#{email_str}'" do
        lambda do
          u = create_user(:email => email_str)
          u.errors[:email].should_not be_empty
        end.should_not change(User, :count)
      end
    end
  end

  describe 'allows legitimate names:' do
    ['Andre The Giant (7\'4", 520 lb.) -- has a posse', 
      '', '1234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890'].each do |name_str|
      it "'#{name_str}'" do
        lambda do
          u = create_user(:name => name_str)
          u.errors[:name].should be_empty
        end.should change(User, :count).by(1)
      end
    end
  end
  
  describe "disallows illegitimate names" do
    ["tab\t", "newline\n",
      '1234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890_234567890_'].each do |name_str|
      it "'#{name_str}'" do
        lambda do
          u = create_user(:name => name_str)
          u.errors[:name].should_not be_empty
        end.should_not change(User, :count)
      end
    end
  end

以上代码皆抄自于restful_authentication，修改的地方就是u.errors处的API在Rails3中有改动。Rails3会返回[]，也就是说原来这里的判定为be_nil是不行的，基本上都要改。

上述代码和我以前写的Rspec代码有3个明显的优点我认为，

  def clean_user(options = {})
    user = User.new({:name => 'Tom.Zhao', :email => '[email protected]', :password => 'Tom.Zhao'}.merge(options))
  end

  it 'should require name, email password' do
    clean_user(:name => '').should_not be_valid
    clean_user(:email => '').should_not be_valid
    clean_user(:password => '').should_not be_valid
  end

  it 'has lengh 5 ~ 40 of password' do
    clean_user(:password => '1234').should_not be_valid
    clean_user(:password => '1234' * 10 + '1' ).should_not be_valid
    clean_user(:password => '12345').should be_valid
    clean_user(:password => '1234' * 10).should be_valid
  end

1:由lambda匿名函数执行验证测试，并且返回一个Proc对象直接验证是否save！
2:大量的条件验证，[].each do |name_str|的用法出来的结果更直观，同时代码可读性更高一些。
3:对于在model中的validates:format => {:with => RE_EMAIL_OK, :message => MSG_EMAIL_BAD}，可以直接验证返回的错误message。

测试写好了，我们该给model添加东西了，Rails3推出了validates可以让我们的写法更性感，它可以使用的参数为

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    * :acceptance => Boolean
    * :confirmation => Boolean
    * :exclusion => { :in => Ennumerable }
    * :inclusion => { :in => Ennumerable }
    * :format => { :with => Regexp }
    * :length => { :minimum => Fixnum, maximum => Fixnum, }
    * :numericality => Boolean
    * :presence => Boolean
    * :uniqueness => Boolean

修改user.rb

  include ApplicationHelper
 
  validates :login, :presence => true, 
                    :uniqueness => { :case_sensitive => false },
                    :length => {:minimum => 3, :maximum => 40},
                    :format => {:with => RE_LOGIN_OK, :message => MSG_LOGIN_BAD}
                    
  validates :email, :presence => true, 
                    :uniqueness => { :case_sensitive => false },
                    :length => {:minimum => 6, :maximum => 100},
                    :format => {:with => RE_EMAIL_OK, :message => MSG_EMAIL_BAD}
                    
  validates :name,  :length => {:maximum => 100},
                    :format => {:with => RE_NAME_OK, :message => MSG_NAME_BAD}
         
  validates :password,  :presence => true
  
  validates :password_confirmation,  :presence => true
                            
  attr_accessor :password, :password_confirmation

Rails3的新validates我十分喜欢，作用一目了然，并且十分性感。顺便说一下
:format => {:with => EmailRegexp}这里，针对常用的验证，比如Email，可以抽出来，在lib目录下新加一个email_validator.rb

class EmailValidator < ActiveModel::EachValidator

  EmailAddress = begin
    qtext = '[^\\x0d\\x22\\x5c\\x80-\\xff]'
    dtext = '[^\\x0d\\x5b-\\x5d\\x80-\\xff]'
    atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-' +
      '\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+'
    quoted_pair = '\\x5c[\\x00-\\x7f]'
    domain_literal = "\\x5b(?:#{dtext}|#{quoted_pair})*\\x5d"
    quoted_string = "\\x22(?:#{qtext}|#{quoted_pair})*\\x22"
    domain_ref = atom
    sub_domain = "(?:#{domain_ref}|#{domain_literal})"
    word = "(?:#{atom}|#{quoted_string})"
    domain = "#{sub_domain}(?:\\x2e#{sub_domain})*"
    local_part = "#{word}(?:\\x2e#{word})*"
    addr_spec = "#{local_part}\\x40#{domain}"
    pattern = /\A#{addr_spec}\z/
  end

  def validate_each(record, attribute, value)
    unless value =~ EmailAddress
      record.errors[attribute] << (options[:message] || "is not valid") 
    end
  end
  
end

那这里的代码可以直接这样写

validates :email, :presence => true, 
                    :length => {:minimum => 3, :maximum => 254},
                    :uniqueness => true,
                    :email => true

回到目前代码中。
同时定义一些常量在ApplicationHelper中

  unless defined? CONSTANTS_DEFINED
      RE_LOGIN_OK     = /\A\w[\w\.\-_@]+\z/
      MSG_LOGIN_BAD   = "use only letters, numbers, and .-_@ please."

      RE_NAME_OK      = /\A[^[:cntrl:]\\<>\/&]*\z/
      MSG_NAME_BAD    = "avoid non-printing characters and \\&gt;&lt;&amp;/ please."

      RE_EMAIL_NAME   = '[\w\.%\+\-]+'
      RE_DOMAIN_HEAD  = '(?:[A-Z0-9\-]+\.)+'
      RE_DOMAIN_TLD   = '(?:[A-Z]{2}|com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum)'
      RE_EMAIL_OK     = /\A#{RE_EMAIL_NAME}@#{RE_DOMAIN_HEAD}#{RE_DOMAIN_TLD}\z/i
      MSG_EMAIL_BAD   = "should look like an email address."

      CONSTANTS_DEFINED = 'yup'
    end

保存之后，看到autotest窗口测试全部通过，OK!
接下来处理密码加密，以及Email激活，是用Rails3自带的状态机，还是用state_machine呢？这是个问题。

10月1号搞定下一步。