jquery,keypress,enter,keycode

        $('.serchStockInput').keypress(function (e) {
          if(e.keyCode == 13) {
            track();
            return false;
          }
        });

composed_of,model,data object

http://hideto.javaeye.com/blog/77459
http://rorataspire.wordpress.com/2008/07/10/rails-composed_of/
http://api.rubyonrails.org/classes/ActiveRecord/Aggregations/ClassMethods.html#M001663
http://opensoul.org/2006/11/16/making-code-composed_of-code-more-useful

composed_of 感覺就是用來把妳一些 field 在弄成一個 object, 當然也就可以拿這個 value object  產生出新的 object, 也可以用在find 裡面當條件用

   1. class Person < ActiveRecord::Base
  2.   composed_of :address,
  3.               :class_name => "Address",
  4.               :mapping => [%w(address_street street),
  5.                            %w(address_city city),
  6.                            %w(address_state state),
  7.                            %w(address_country country)]
  8. 
  9. class Address
 10.   attr_accessor :street, :city, :state, :country
 11.   def initialize(street, city, state, country)
 12.     @street = street
 13.     @city = city
 14.     @state = state
 15.     @country = country
 16.   end
 17. end

person.address = Address.new(...)  
person.save
person.address.city = "LA"  
person.save
這不會更新person的city字段，因為composed_of()的值對象被認為是immutable的，而只有new一個Address對象才能保存


class UserData
 attr_accessor :name

 def initialize(name)
   @name = name
 end
end

class User < ActiveRecord::Base
  composed_of :user_data, :mapping =>%w(name name)   <= 其實是這樣 ["name", "name"]
end

現在就可以用這樣了
>> u = UserData.new('ilake')
=> #<UserData:0xb7197f28 @name="ilake">
>> User.find(:all, :conditions => {:user_data => u})
=> [#<User id: 5, name: "ilake"]

module_eval,class_eval,singleton

http://onestepback.org/articles/10things/page027.html
http://my.donews.com/idlecat/2006/08/20/IpzenftEYkWGFjJpxPTDTJTCDOGKqTPzCaPZ/llllll
http://blackanger.blog.51cto.com/140924/84057
http://fcamel.twbbs.org/archives/2008/04/07/474/
http://tw.myblog.yahoo.com/weijenlu/article?mid=99&prev=109&next=-1

class Module
  def trace_attr(sym)
  self.module_eval <<-EOS      <= 也可以說是動態產生 method 的方法
     def #{sym}
          printf "Accessing %s with value %s\n",
        "#{sym}", @#{sym}.inspect
        @#{sym}
      end
   EOS
   end
end

class Dog
trace_attr :name
def initialize(string)
   @name = string
end
end
p Dog.new("Fido").name

class Test
end

code =<<-EOF
   def hello_module
     'hello world, use module'
    end
EOF Test.module_eval(code)          <= 動態塞段 code 進去, method 就生了, 太神啦 
p Test.new.hello_module()


Test.class_eval <<-END          <= 有直接塞進class的 fu
def hello_class
'  hello world, use class'
end
END
p Test.new.hello_class()

t = Test.new
class << t                      <= 可以直接塞method 進  t 這個  object
 def hello_singleton
   'hello singleton'
 end
end

class << Test                <= Test class也是 oject 當然也可以塞
 def class_singleton       
   'class singleton'
 end
end


class Announce < ActiveRecord::Base
 require_dependency 'forum/forum_model_mixin'
 include ForumModelMixin
end

module ForumModelMixin
 def self.included(klass)                  <= klass可以知道是哪個 class include了這個lib
     klass.class_eval do               

     has_many :forum_comments, :as => :forum
     alias_method :old_destroy, :destroy
     validates_presence_of :content, :subject, :user_id

     def destroy(r)
       if r
         old_destroy
       else
         update_attribute(:removed_at, Time.now)  if !removed_at
       end
     end
   end
 end
end

Dir,entries,glob

http://www.ruby-doc.org/core/classes/Dir.html

Dir.entries("#{RAILS_ROOT}/public/images/score/1")
=> ["victory_32.png", "..", "victory_128.png", "victory_64.png", "."]

Dir.glob("#{RAILS_ROOT}/public/images/score/1")
=> ["/home/lake/rails_app/iwakela/public/images/score/1"]

instance_variable_get,delegate

http://ihower.idv.tw/blog/archives/1719
http://blog.gugl.org/archives/41
http://www.ruby-doc.org/core/classes/Object.html#M000380
http://www.ruby-doc.org/core/classes/Module.html#M001677
http://www.ruby-doc.org/core/classes/Hash.html#M002868


KEYS_MAPPINGS.each do |key, value|
define_method key, lambda {                    <= 用來生 method 的 method
instance_variable_get('@hash')[value]       <= 可以直接拿 @hash instance variable 的 值
}
end


  KEYS_MAPPINGS = {
    :ask       =>  'BSELL' ,    :bid     =>  'BBUY'    ,
    :change  =>  'CHANGE',   :high   =>  'HIGH',
:target_id   =>  'STKID' ,  :target_name =>  'STKNAME'
  }

 delegate_opts = MarketData::KEYS_MAPPINGS.keys.reject do |e|
e == :target_id || e== :target_name
end.push(:to => :market_data)            <= 呼叫 名為 market_data的 instance _function, 一般常是 has_one :thing 的 thing, 不過一樣意思, 就是叫後面這個 function
delegate *delegate_opts                      <= delegate_opts = [:ask, :bid, :change, :high, {:to => :market_data}]
                                                           <= delegate *delegate_opts 就是  delegate :ask, :bid, :change, :high, :to => :market_data
                                                           <= delegate 可以一次傳入多個 parameter
def market_data(key=nil)     
@market_data ||= MarketData.target(target_id)
key && @market_data ?  @market_data[key] : @market_data     <= 有傳 key 跟沒傳key return的東西不同
end


[User model]
 has_one :profile

 field = Profile.content_columns.inject([]) do |result, column|   <= content_columns, 濾掉 _id, _count的那些
   result << column.name
 end.push(:to => :profile)

 delegate *field

 User.first.address      <= 現在可以直接這樣用了

has_many,through,source,source_type,foregin_key,class_name

  #我發表過forum的comments
  has_many :forum_comments, :through => :forums, :source => :comments

 
  #forum 裡有我的 comments的 forum, 找出 forum array
  has_many :forums_has_comments,
           :through => :comments,
           :source  => :record,
           :source_type => 'Forum'

  #我在forum 裡所有的comments, 找出 comments array
  has_many :comments_in_forums,
           :foreign_key => :user_id,
           :class_name => 'Comment',
           :conditions => {:record_type => 'Forum'}

rails,version,uninstall

rails _2.0.2_ your_old_rails_project <= 指定用哪個版本rails 去安裝
sudo gem uninstall rails -v 2.1.0 <= 移除某個版本的rails

length, mysql

User.find(:first, :order => "length(nickname) DESC")

SELECT * FROM `user` ORDER BY length(nickname) DESC LIMIT 1

Has_one with :source_type

http://www.javaeye.com/topic/129195

class Client < ActiveRecord::Base
  has_many :contact_cards
  has_many :business_contacts,
           :through => :contact_cards,
           :source => :contact,  <= 跟 as => :this_item  的this_item 一樣  
           :source_type => 'Business'  
end

class Business < ActiveRecord::Base
  has_many :contact_cards, :as => :contact
end

class ContactCard < ActiveRecord::Base
  belongs_to :client
  belongs_to :contact, :polymorphic => true
end

User.first.business_cards  <= 第一個user的contact card of bussiness category

有些form function 需要共用時, 可以放在layout

//隱藏在角落的  form
<% form_tag({:action => :show}, :class => 'show_stock') do %>
  <%= hidden_field_tag :id %>
<% end %>

     $(function(){
        $('.layout.searchStockBtn').click(function() {
         var val  = $(this).parent().parent().find('.target_search').val();
         var form = $('.show_stock');   <= 把 隱藏的 form 拿出來用
         form.attr('action','<%= targets_show_path(:id => "") %>'); <= 把 form 的 action 變成其他 url
         form.find('input').attr('name','id').val(val);  <= 找值
         form.get(0).submit();
         return false;
      });

svn, update

http://svnbook.red-bean.com/en/1.0/re28.html
You can also update your working copy to an older revision

svn update -r30

---

svn diff -rPREV
svn diff file_name -rPREV
svn log --limit
svn log --limit 2 main.css
svn cat -r5323 show.rhtml

svn merge -r7311:7389 svn://svn.icetech.com.tw/serac/youholder/branches/haruko
svn import earlybirds/ svn://bigcat.dlinkddns.com/eb/trunk

ruby-debugger

http://bashdb.sourceforge.net/ruby-debug.html#SEC_Top
http://thedaneshproject.com/posts/how-to-reload-your-bashrc-file/

We could create a file called .rdebugrc, and put these lines in

set autoeval             <= 不用再打 p 印 value
set autolist               <=  自動列出所在行數
set autoreload           <= 可以隨時加debugger, 他會自己reload

csv,send_file

http://synthesis.sbecker.net/articles/2007/06/07/how-to-generate-csv-files-in-rails
http://api.rubyonrails.org/classes/ActionController/Streaming.html#M000228
http://lightyror.thegiive.net/2007/01/faster-csv.html

passenger, mod_rails

http://www.modrails.com/install.html
http://ihower.idv.tw/blog/archives/1741
http://nubyonrails.com/articles/ask-your-doctor-about-mod_rails
http://duckpunching.com/passenger-mod_rails-for-development-now-with-debugger
http://www.modrails.com/documentation/Users%20guide.html

1. Open a terminal, and type:

   gem install passenger

2. Type:

   passenger-install-apache2-module

3. /etc/apache2/apache2.conf
   LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.0.3/ext/apache2/mod_passenger.so
   PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.0.3
   PassengerRuby /usr/bin/ruby1.8
   
   RailsEnv development <= development mode, default is production mode
4. /etc/apache2/sites-available/iwakela
   
<virtualhost>
ServerAdmin iwakela@localhost

ServerName iwakela.local
DocumentRoot /home/lake/rails_app/iwakela/public
</virtualhost>

5. sudo ln -s /etc/apache2/sites-available/iwakela /etc/apache2/sites-enabled/001-iwakela
6. /etc/init.d/apache2 restart/start/stop
7. /etc/hosts
127.0.1.1 iwakela.local

enable debugger

8. 
   # ... bottom of your development.rb
   
   if File.exists?(File.join(RAILS_ROOT,'tmp', 'debug.txt'))
   require 'ruby-debug'
   Debugger.wait_connection = true
   Debugger.start_remote
   File.delete(File.join(RAILS_ROOT,'tmp', 'debug.txt'))
   end
   


9. 
   # add this rake file to your lib/tasks folder
   # File: restart.rake
   task :restart do
   system("touch tmp/restart.txt")
   system("touch tmp/debug.txt") if ENV["DEBUG"] == 'true'
   end
   


10. 
    rake restart DEBUG=true
    


11. 
    rdebug -c
    

---

cgi,encode,decode,escape,unescape,escapeHTML

>> CGI::escapeHTML('&')       <= HTML編碼
=> "&"
>> CGI::unescapeHTML('&')
=> "&"
>> CGI::escape('&')                <= unicode
=> "%26"
>> CGI::unescape('%26')
=> "&"

ie, clone,timeout,setTimeout

http://blog.roodo.com/jaceju/archives/7231115.html

$.browser.msie    <= check browser type

$(function () {
   $('#copy').click(function () {
       var $checkedValues = $('input.test:checked').clone();
       if ($.browser.msie) {
           setTimeout(function () { $checkedValues.attr('checked', true); }, 0);
       }
       $('#target').html('').append($checkedValues);
      
       setTimeout(function () {
           // 其他可能會對處理到 checkbox 的動作
       }, 0);
   });
});

//setTimeout 可以確保程式在 DOM 完全更新後，再執行下一步的動作。

rescue_action_in_public, local_request, 取消 local request

http://api.rubyonrails.com/classes/ActionController/Rescue.html#M000615
http://blog.hendrikvolkmer.de/2007/3/8/http-referer-and-redirect_to-back

[config/environments/development.rb]     
config.action_controller.consider_all_requests_local = false

#  force the request connect from outside
def local_request?
  false
end

#有上面兩個條件rescue_action_in_public才可以在local測
def rescue_action_in_public(exception)
  case exception 
  when ActionController::RoutingError
    redirect_to home_url
  else
    super
  end
end



<%= stylesheet_link_tag "defaults",  "paginator", :cache => 'css_cache' %>
<%= javascript_include_tag "jquery", "jquery.corner.js", "jquerypngfix.js", :cache => 'js_cache' %>

上述的這些 :cache 功能 如果 client ip 是從 local來 就不會跑, 不會生出 css_cache.css 或 js_cache.js

javascript, scope, function

<script type="text/javascript">
   var global_function = null;   <= 宣告在這裡才是global的        
       (function($){              
           function local_funtion() {    <= 這裡只是 local的 
           }
           global_funcion = function() {    <= 指定變數  成function     
           }     
        })(jQuery);
</script>
<script type="text/javascript">  
     global_function();       <=  global這裡才叫的到 
</script>

substring, substr,js

String.substr(N1,N2) ：從指定的位置(N1)截取指定長度(N2)的字串。
String.substring(N1,N2) ：從指定的位置(N1)到指定的位置(N2)的字串。

request methods

http://api.rubyonrails.org/classes/ActionController/AbstractRequest.html#M000802

How to limit users to one vote per IP address

http://railsauthority.com/tutorial/how-to-limit-users-to-one-vote-per-ip-address
http://railsauthority.com/tutorial/how-to-obtain-the-ip-address-of-the-current-user
http://ithelp.ithome.com.tw/question/10011184

# 以 regular expression 的設法來指定可執行的 IP 或範圍  
 unless request.env['HTTP_X_REAL_IP'] =~ /^192\.168\.1\.(101|204|77|9)$|^168\.95\.1\./  
        render :text => '不准看！'  
 end

layout, select_layout

  layout :select_layout

  def select_layout
    case action_name
    when 'action1', 'action2'
      'layout1'
    when 'action3'
      'layout2'
    end
  end 

image_tag, path, url

http://api.rubyonrails.com/classes/ActionView/Helpers/AssetTagHelper.html


  ActionController::Base.asset_host = "assets.example.com"
  image_tag("rails.png")
    => <img src="http://assets.example.com/images/rails.png" alt="Rails" />
  stylesheet_link_tag("application")
    => <link href="http://assets.example.com/stylesheets/application.css" media="screen" rel="stylesheet" type="text/css" />


  ActionController::Base.asset_host = Proc.new { |source| "http://assets#{rand(2) + 1}.example.com" }
  image_tag("rails.png")
    => <img src="http://assets2.example.com/images/rails.png" alt="Rails" />
  stylesheet_link_tag("application")
    => <link href="http://assets1.example.com/stylesheets/application.css" media="screen" rel="stylesheet" type="text/css" />


  ActionController::Base.asset_host = Proc.new { |source|
     if source.starts_with?('/images')
       "http://images.example.com"
     else
       "http://assets.example.com"
     end
   }
  image_tag("rails.png")
    => <img src="http://images.example.com/images/rails.png" alt="Rails" />
  stylesheet_link_tag("application")
    => <link href="http://assets.example.com/stylesheets/application.css" media="screen" rel="stylesheet" type="text/css" />


  ActionController::Base.asset_host = Proc.new { |source, request|
    if request.ssl?
      "#{request.protocol}#{request.host_with_port}"
    else
      "#{request.protocol}assets.example.com"
    end
  }

ㄎㄎ