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Ruby/Ruby on Rails/step by step ¤ÎÊѹ¹ÅÀ

Top / Ruby / Ruby on Rails / step by step

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[[Ruby/Ruby on Rails]]

Ruby on Rails¤Ç·«¤êÊÖ¤·Áàºî¤·¤Æ³Ð¤¨¤¿¤¤»öÊÁ¤òstep¤È¤·¤ÆÀ°Íý¤·¤Þ¤·¤¿¡£~

#contents

*step01 InstantRails¤Îµ¯Æ°¤Èirb
C:\InstantRails\InstantRails.exe¤ò¥À¥Ö¥ë¥¯¥ê¥Ã¥¯¤·¤Æµ¯Æ°¤·¤Þ¤¹¡£~
#ref(step01_InstantRails.gif)
~
DOS¥×¥í¥ó¥×¥È²èÌ̤ò³«¤­¡¢irb¤ÇÁàºî¤·¤Æ¤ß¤Þ¤¹¡£~
[I¤Î¥¢¥¤¥³¥ó] - [Rails Applications] - [Open Ruby Console Window]~
#ref(step01_irb.gif)
³Æ¥³¥Þ¥ó¥É¤Î°ÕÌ£
|¥³¥Þ¥ó¥É|Æ°ºî|h
|cmd /f:o|ctrl+f¤Ç¤Î¥Õ¥¡¥¤¥ë̾Êä´°¤òÍ­¸ú¤È¤·¤Þ¤¹|
|ruby -v|ruby¤Î¥Ð¡¼¥¸¥ç¥ó¤òɽ¼¨¤·¤Þ¤¹|
|irb -ribr/completion|Êä´°µ¡Ç½Í­¤ê¤Çirb¤òµ¯Æ°¤·¤Þ¤¹|
|pu[tab]|ÅÓÃæ¤Çtab¥­¡¼¤ò²¡¤¹¤ÈÊä´°¤¬¸ú¤­¤Þ¤¹|
|puts "Hello World!"|rubyʸ¤òÂǤĤȤ¹¤°¤Ë¼Â¹Ô¤µ¤ì¤Þ¤¹|
|exit|irb¤ò½ªÎ»¤·¤Þ¤¹|
¤è¤¯»È¤¦Áàºî¤òrails_appsľ²¼¤Î¥Ð¥Ã¥Á¥Õ¥¡¥¤¥ë¤Ë¤·¤Þ¤·¤¿¡£
|¥Ð¥Ã¥Á¥Õ¥¡¥¤¥ë̾|ÆâÍÆ|h
|setenv.bat|cmd /f:o|
|irb.bat|C:\InstantRails\ruby\bin\irb -rirb/completion|



*step02 ¥×¥í¥¸¥§¥¯¥È¤Î¿·µ¬ºîÀ®
+InstantRails¤«¤éDOS¥×¥í¥ó¥×¥È¤ò³«¤¯~
¥«¥ì¥ó¥È¥Õ¥©¥ë¥À¤ÏC:\InstantRails\rails_apps¤È¤Ê¤ê¤Þ¤¹¡£
+¡Örails ¥×¥í¥¸¥§¥¯¥È̾¡×¤Ç¥×¥í¥¸¥§¥¯¥È¤ò¿·µ¬ºîÀ®
+¡Öcd ¥×¥í¥¸¥§¥¯¥È̾¡×¤Ç¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ë°ÜÆ°~
°Ê¹ß¤ÎÁàºî¤Ï¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ç¹Ô¤¤¤Þ¤¹¡£



*step03 Mongrel web¥µ¡¼¥Ð¤Îµ¯Æ°
+¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Çruby script\server¤ò¼Â¹Ô¤·¤ÆMongrel web¥µ¡¼¥Ð¤òµ¯Æ°~
ctrl+c¥­¡¼¤ÇÃæÃǤǤ­¤Þ¤¹¡£
+http://127.0.0.1:3000/¤ò¥Ö¥é¥¦¥¶¤Ç³«¤¯¤È¡¢¥×¥í¥¸¥§¥¯¥È¤ÎWeb¥Ú¡¼¥¸¤¬¸«¤é¤ì¤Þ¤¹¡£



*step04 Aptana Studio RadRails
**UTF-8¤Ë½é´üÀßÄê
+Aptana Studio¤òµ¯Æ°
+ʸ»ú¥³¡¼¥É¤òUTF-8¤Ë½é´üÀßÄê~
[Window] - [Preferences] - [General] - [Workspace] - [Text file encoding]¤òUTF-8¤ÇÀßÄê¤ËÀßÄꤷ¤Þ¤¹¡£
#ref(step04_RadRailsUTF8.gif)



**Rails¥×¥í¥¸¥§¥¯¥È¤Î¥¤¥ó¥Ý¡¼¥È
+[File] - [Import] - [Other] - [Import As New Project] - [Next]
#ref(step04_RadRailsImport01.gif)
+¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤òÀßÄê
#ref(step04_RadRailsImport02.gif)
+¤½¤Î¤Þ¤ÞFinish
#ref(step04_RadRailsImport03.gif)



*step05 ¥Ç¡¼¥¿¥Ù¡¼¥¹ÀßÄê
**config\database.yml¤ò³«¤¤¤Æ¡¢É¬ÍפʾðÊó¤òÆþÎÏ
 development:
   adapter: mysql
   database: ¥×¥í¥¸¥§¥¯¥È̾_development
   username: root
   password:
   host: localhost
 
 test:
   adapter: mysql
   database: ¥×¥í¥¸¥§¥¯¥È̾_test
   username: root
   password:
   host: localhost
 
 production:
   adapter: mysql
   database: ¥×¥í¥¸¥§¥¯¥È̾_production
   username: root
   password: 
   host: localhost



**MySQL¤Î´ûÄê¤Îʸ»ú¥³¡¼¥É¤òUTF-8¤ËÀßÄê
+[Instant Rails] - [I¥¢¥¤¥³¥ó] - [Configure] - [MySql]¤Çmy.ini¤ò³«¤¯
+ËöÈø¤Ë¼¡¤Î£²¹Ô¤òÄɲÃ
 default-character-set=utf8
 skip-character-set-client-handshake



*step06 ¥Ç¡¼¥¿¥Ù¡¼¥¹ºîÀ®
**sql¥³¥Þ¥ó¥É¤ÇºîÀ®¤¹¤ëÊýË¡
+phpMyAdminµ¯Æ°
[Instant Rails] - [I¥¢¥¤¥³¥ó] - [Configure] - [Database(via PhpMyAdmin)]~
¼¡¤Îurl¤ò¥Ö¥é¥¦¥¶¤Ç³«¤¤¤Æ¤âOK¤Ç¤¹¡£~
http://127.0.0.1/mysql/
+SQL¥¢¥¤¥³¥ó¤ò¥¯¥ê¥Ã¥¯
+create database ¥×¥í¥¸¥§¥¯¥È̾_development default charset utf8; 
+ºï½ü¤¹¤ë¤È¤­¤ÏphpMyAdmin¤ò»ÈÍÑ
+´Ä¶­¤òÊѤ¨¤¿DB¤òºîÀ®¤¹¤ë¤È¤­¤Ï¡¢¥³¥Þ¥ó¥É¤Ç¼¡¤Î???Éôʬ¤òtest¤äproduction¤ËÊѹ¹~
create database ¥×¥í¥¸¥§¥¯¥È̾_??? default charset utf8; 



**rake¥¿¥¹¥¯¤ÇºîÀ®¤¹¤ëÊýË¡
+lib\tasks\setup_db.rake¥Õ¥¡¥¤¥ë¤òºîÀ®
 env = ENV['RAILS_ENV'] || 'development'
 database = "¥×¥í¥¸¥§¥¯¥È̾_#{env}"
 
 task :connect_db => [:environment] do
   ActiveRecord::Base.establish_connection(
     :adapter => 'mysql',
     :host => 'localhost',
     :username => 'root',
     :database => 'mysql'
    )
 end
 
 task :setup_db => [:connect_db] do
   ActiveRecord::Schema.define do
     create_database database
   end
 end
 
 task :destroy_db => [:connect_db] do
   ActiveRecord::Schema.define do
     drop_database database
   end
 end
+¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ç¡Örake setup_db¡×
+ºï½ü¤¹¤ë¤È¤­¤Ï¡Örake destroy_db¡×
+´Ä¶­¤òÊѤ¨¤¿DB¤òºîÀ®¤¹¤ë¤È¤­¤Ï¡Örake RAILS_ENV=test setup_db¡×¤Þ¤¿¤Ï¡Örake RAILS_ENV=production setup_db¡×



*step07 migration¤Ë¤è¤ë¥Æ¡¼¥Ö¥ëºîÀ®
+ruby script\generate migration create_memos_table
+db\migrate\001_create_memos_table.rb¤òÊÔ½¸¡Ê¿ô»ú¤ÏÊѤï¤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹¡Ë
 class CreateTable < ActiveRecord::Migration
   def self.up
     create_table :memos do |t|
       t.column :created_at, :datetime
       t.column :text, :string, :limit => 256
       t.column :location, :string, :limit => 64
     end
   end
 
   def self.down
     drop_table :memos
   end
 end
+¡Örake db:migrate¡×¤Ç¥Þ¥¤¥°¥ì¡¼¥È¤ò¼Â¹Ô
+migration¤Ë¤è¤ê¡¢¸åÆüÎ㤨¤Ðʸ»ú¿ô¤òÊѹ¹~
ruby script\generate migration expand_location
+db\migrate\002_expand_location.rb¤òÊÔ½¸¡Ê¿ô»ú¤ÏÊѤï¤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹¡Ë
 class ExpandLocation < ActiveRecord::Migration
   def self.up
   change_column :memos, :location, :string, :limit => 256
   end
 
   def self.down
   change_column :memos, :location, :string, :limit => 64
   end
 end
+¡Örake db:migrate¡×¤Ç¥Þ¥¤¥°¥ì¡¼¥È¤ò¼Â¹Ô
+¥Ð¡¼¥¸¥ç¥ó£±¤ËÌ᤹¤È¤­¤Ï¡¢~
rake db:migrate VERSION=1



*step08 scaffold¤Ë¤è¤ê¥â¥Ç¥ë¤ª¤è¤Ó¥â¥Ç¥ë¤Ë¥¢¥¯¥»¥¹¤¹¤ë­¾ì¤Î¥Ú¡¼¥¸¤òºîÀ®
¥×¥í¥¸¥§¥¯¥È¥ë¡¼¥È¤Ç¼¡¤Î¥³¥Þ¥ó¥É¤òÆþÎÏ
 ruby script\generate scaffold ¥â¥Ç¥ë̾
 ¢¨¥â¥Ç¥ë̾¤Ï¥¢¥Ã¥Ñ¡¼¥­¥ã¥á¥ë¤Îñ¿ô·Á¤Ç¤¹
Î㤨¤Ð¡Öruby script\generate scaffold Memo¡×¤È¤·¤¿¾ì¹ç¡¢¼¡¤Î¥Ú¡¼¥¸¤¬ºîÀ®¤µ¤ì¤Þ¤¹
-http://127.0.0.1:3000/memos/list ... °ìÍ÷
-http://127.0.0.1:3000/memos/new ... ºîÀ®
-http://127.0.0.1:3000/memos/show/id ... ɽ¼¨
-http://127.0.0.1:3000/memos/edit/id ... ¹¹¿·
-http://127.0.0.1:3000/memos/destroy/id ... ºï½ü

¢¨¥³¥ó¥È¥í¡¼¥é¡¼¤¬memos¡¢¥¢¥¯¥·¥ç¥ó¤¬list, new, show, edit, destroy¤È¤Ê¤ê¤Þ¤¹

¼¡¤Î¥Õ¥¡¥¤¥ë¤¬ºî¤é¤ì¤Þ¤¹¡£
-app\models\memo.rb ... ¥â¥Ç¥ë
-app\controllers\memos_controller.rb ... ¥³¥ó¥È¥í¡¼¥é¡¼
-app\views\layouts\memos.rhtml ... Web¥¢¥×¥êÁ´ÂΤΥӥ塼
-app\views\memos\edit.rhtml ... edit¥¢¥¯¥·¥ç¥ó¤Î¥Ó¥å¡¼¡ÊÊÔ½¸¤Î¥Ó¥å¡¼¡Ë
-...



*step09 ¥â¥Ç¥ë¤Ø¤Î¸¡¾Ú½èÍýÄɲÃ
¥â¥Ç¥ë¤Ë¸¡¾Ú¥á¥½¥Ã¥É¤òÄɲä·¤Þ¤¹¡£~
app\models\memo.rb
 class Memo < ActiveRecord::Base
   validates_presence_of :text, :location
   validates_length_of :location, :maximum => 256
   validates_length_of :¥Õ¥£¡¼¥ë¥É̾, :within 6..12
 end
ºÇ¸å¤ÎÎã¤Ï6ʸ»ú°Ê¾å12ʸ»ú°Ê²¼¤Ç¤¹¡£~
¥É¥Ã¥È¤ò£³¤Ã¤Ä¤È¤¹¤ë¤È¡Ö̤Ëþ¡×¤È¤Ê¤ê¤Þ¤¹¡£



*step10 ·îÁªÂò¤Î¥Õ¥©¡¼¥à¤ò±Ñ¸ì¤«¤é¿ô»ú¤ËÊѹ¹
app\views\memos\_form.rhtml
 ...
 <%= datetime_select 'memo', 'created_at', :use_month_numbers => true %></p>
 ...
_form.rhtml¤«¤é¡Öcreated_at¡×¤Îɽ¼¨¤ò´Ý¤´¤Èºï½ü¤¹¤ë¤È¡¢¼«Æ°Åª¤Ë¥Ç¡¼¥¿ºîÀ®Æü»þ¤¬ÀßÄꤵ¤ì¤Þ¤¹¡£



*step11 ¥¤¥ó¥¹¥È¡¼¥ë¤µ¤ì¤¿gem¤ÎAPI¥É¥­¥å¥á¥ó¥È»²¾È
+DOS¥×¥í¥ó¥×¥È¤«¤égem_server¤ÈÆþÎÏ
+¥Ö¥é¥¦¥¶¤Ç¼¡¤Îurl¤ò³«¤¯~
http://127.0.0.1:8808/~
Î㤨¤Ð¸¡¾Ú¤ÇÍѤ¤¤ë¥á¥½¥Ã¥É¤Ï¼¡¤ÎAPI¤ò»²¾È¤·¤Þ¤¹¡£~
[activerecord rdoc] - [ActiveRecord::Validations::ClassMethods]



*step12 Ruby-GetText¤Î¥¤¥ó¥¹¥È¡¼¥ë
+¡Øgettext-1.10.0-mswin32.gem¡Ù¤òÆþ¼ê
+Instant Rails¤òµ¯Æ°¤·¡¢¤½¤³¤«¤éDOS¥×¥í¥ó¥×¥È¤ò³«¤¯
+¥³¥Þ¥ó¥É¤òÆþÎϤ·¤Æ¥¤¥ó¥¹¥È¡¼¥ë
 gem install C:\tmp\gettext-1.10.0-mswin32.gem
È÷¹Í¡§
--¡Ögem install gettext¡×¤ÈÆþÎϤ·¤Æ¡¢¥ª¥ó¥é¥¤¥ó¼èÆÀ¤·¤¿¥á¥Ë¥å¡¼¤«¤éÁªÂò¤¹¤ë¥¤¥ó¥¹¥È¡¼¥ëÊýË¡¤â¤¢¤ë¤½¤¦¤Ç¤¹¤¬¡¢¤Ê¤¼¤«¡ÖGemNotFoundException¡×¤È¤Ê¤ê¥¤¥ó¥¹¥È¡¼¥ë¤Ç¤­¤Þ¤»¤ó¤Ç¤·¤¿¡£
--¤³¤ì¤è¤ê¿·¤·¤¤¥Ð¡¼¥¸¥ç¥ó¤ÎRuby-GetText¤ÏRails 2.0¤Î¤ßÂбþ¤Ç¤¹
--¥¤¥ó¥¹¥È¡¼¥ëÀ衧C:\InstantRails\ruby\lib\ruby\gems\1.8\gems\gettext-1.10.0-mswin32
+GNU GetText¤ò¥¤¥ó¥¹¥È¡¼¥ë~
¡Øruby-gnome2-0.16.0-1-i386-mswin32.exe¡Ù¤òÆþ¼ê¤·¤Æ¥¤¥ó¥¹¥È¡¼¥ë¤·¤Þ¤¹¡£~
¥¤¥ó¥¹¥È¡¼¥ëÀ衧C:\InstantRails\ruby\Ruby-GNOME2
+Instant Rails¤òºÆµ¯Æ°



*step13 Ruby-GetText¤òÍøÍѤ¹¤ë¤è¤¦¥×¥í¥¸¥§¥¯¥È¤ËÀßÄê
+¡Øgettext.rake¡Ù¤òlib\tasks¤Ë¥³¥Ô¡¼
+script\server¥³¥Þ¥ó¥É¤ò¼Â¹ÔÃæ¤Î¤È¤­¤Ïctrl+c¥­¡¼¤ÇÄä»ß~
config¥Õ¥©¥ë¥ÀÆâ¤Î¥Õ¥¡¥¤¥ë¤òÊѹ¹¤¹¤ë¤È¤­¤ÏºÆµ¯Æ°¤¬É¬Íפʤ¿¤á¤Ç¤¹¡£
+¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ç¡Örake init_gettext¡×¤ò¼Â¹Ô~
¸µ¤ËÌ᤹¤È¤­¤Ï¡Örake void_gettext¡×¤ò¼Â¹Ô
+ruby script\server¤ÇWeb¥µ¡¼¥ÐºÆµ¯Æ°



*step14 Ruby-GetText¤òÍøÍѤ·¤ÆÆüËܸ첽
+¥Ó¥å¡¼¤Î½ñ¤­´¹¤¨Îã~
app\views\memos\_form.rhtml¤ò¼¡¤Î¤è¤¦¤Ë½ñ¤­´¹¤¨
 <label for="memo_created_at">Create at</label>
         ¢­
 <label for="memo_created_at"><%=h _('Create at')%></label>
app\controllers\memos_controller.rb¤ò¼¡¤Î¤è¤¦¤Ë½ñ¤­´¹¤¨
       flash[:notice] = 'Memo was successfully created.'
         ¢­
       flash[:notice] = _('Memo was successfully created.')
+pot/po¥Õ¥¡¥¤¥ëºîÀ®
 rake update_po
+po¥Õ¥¡¥¤¥ë¤Ëɽ¼¨Ê¸¸À¤òÄêµÁ~
po\ja\memopad.po½ñ¤­´¹¤¨Îã
 #: app/views/memos/_form.rhtml:4
 msgid "Create at"
 msgstr "ºîÀ®ÆüÉÕ"
 ...
 #: app/controllers/memos_controller.rb:26
 msgid "Memo was successfully created."
 msgstr "¥á¥â¤ÎºîÀ®¤ËÀ®¸ù¤·¤Þ¤·¤¿"
+mo¥Õ¥¡¥¤¥ëºîÀ®
 rake make_mo



*step15 ¥Æ¥¹¥È¶îÆ°³«È¯(TDD, Test Driven Development)¤Î½àÈ÷
+¥Æ¥¹¥ÈÍÑDBºîÀ®~
¼¡¤Î¤É¤Á¤é¤«¤ÇºîÀ®¤·¤Þ¤¹¡£
--phpMyAdmin SQL¥³¥Þ¥ó¥ÉÆþÎϤÇ~
create database ¥×¥í¥¸¥§¥¯¥È̾_test default charset utf8;
--DOS¥×¥í¥ó¥×¥È ¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ç¤Î¥³¥Þ¥ó¥ÉÆþÎϤÇ~
rake RAILS_ENV=test setup_db
+¥Æ¥¹¥È¤ò¼Â¹Ô~
¥×¥í¥¸¥§¥¯¥È¥Õ¥©¥ë¥À¤Ç¡Örake¡×
+ÀÅŪ¥Æ¥¹¥È¥Ç¡¼¥¿ÍÑ°Õ~
test\fixtures\memos.yml
 one:
   id: 1
   text: ¥Æ¥¹¥È¥Ç¡¼¥¿#1
   location: ¼«Âð
 two:
   id: 2
   text: ¥Æ¥¹¥È¥Ç¡¼¥¿#2
   location: Ï©¾å
¥Æ¥¹¥È¥Ç¡¼¥¿ ¥×¥í¥°¥é¥àÀ¸À®Îã
 today: <%= Date.today.to_s %>
 created_at: <%= Time.now.to_formatted_s :db %>
+ưŪ¥Æ¥¹¥È¥Ç¡¼¥¿ÍÑ°Õ~
test\functional\memos_controller_test.rb
   ...
   def setup
     @controller = MemosController.new
     @request    = ActionController::TestRequest.new
     @response   = ActionController::TestResponse.new
 
     @first_id = memos(:one).id ¢«¤³¤Î¤è¤¦¤Ëfirst¤«¤éone¤Ë½ñ¤­´¹¤¨
   end
   ...
   def test_create
     num_memos = Memo.count
 
 ### post :create, :memo => {}
 ###     ¢­¤³¤Î¤è¤¦¤Ë¥Æ¥¹¥È¥Ç¡¼¥¿¤òÄêµÁ
     post :create, :memo => {:text => '¥Æ¥¹¥È¥Ç¡¼¥¿#3', :location => '¥Æ¥¹¥È'}
 
     assert_response :redirect
     assert_redirected_to :action => 'list'
 
     assert_equal num_memos + 1, Memo.count
   end
   ...
+ºÆ¤Ó¡Örake¡×¤Ç¥Æ¥¹¥È¤ò¼Â¹Ô¤·¡¢failures, errors¤¬£°¤È¤Ê¤ë¤³¤È¤ò³Îǧ



*step16 ¥æ¥Ë¥Ã¥È¥Æ¥¹¥È¡Ê¾Êά¡Ë
¡Ø10Æü¤Ç¤ª¤Ü¤¨¤ëRuby on Rails¡Ù148¥Ú¡¼¥¸¤ò¤´»²¾È¤¯¤À¤µ¤¤¡£



*step17 ¥Õ¥¡¥ó¥¯¥·¥ç¥Ê¥ë¥Æ¥¹¥È¡Ê¾Êά¡Ë
¡Ø10Æü¤Ç¤ª¤Ü¤¨¤ëRuby on Rails¡Ù164¥Ú¡¼¥¸¤ò¤´»²¾È¤¯¤À¤µ¤¤¡£



*step18 ¥Ó¥å¡¼½ñ¤­´¹¤¨Î㡧ÆþÎϤ·¤¿ÆâÍƤ¬'http://'¤Ç»Ï¤Þ¤ë¤È¤­¤Ë¥ê¥ó¥¯¤È¤·¡¢ÆüÉÕyyyy-mm-dd hh:mm¤ËÊѹ¹
app\views\memos\list.rhtml
 <h1><%=h _('Listing memos') %></h1>
 
 <table border="1">
   <tr>
   <% for column in Memo.content_columns %>
     <th><%= column.human_name %></th>
   <% end %>
   </tr>
   
 <% for memo in @memos %>
   <tr>
   <% for column in Memo.content_columns %>
     <% if column.name == 'location' && memo.location.index('http://') == 0 %> ... ¤³¤Î¤è¤¦¤Ë½ñ¤­´¹¤¨
       <td><%= link_to h(memo.location), memo.location %></td> ... ¥ê¥ó¥¯¤Î½ñ¤­Êý¤Ç¤¹¡£
                                                                   ɽ¼¨ÆâÍƤÏh()¤Ç¥¨¥¹¥±¡¼¥×¤·¤Þ¤¹¡£
     <% else %>
       <td><%=h memo.send(column.name) %></td> ... send()¤òÍѤ¤¤ë¤È¥Õ¥£¡¼¥ë¥É̾¤ò·è¤á¤º¤Ë¥ë¡¼¥×½èÍý¤Ç¤­¤Þ¤¹¡£
                                                   Î㤨¤Ðcolumn.name¤¬'text'¤Î¤È¤­¡¢memo.send(column.name)¤Ï
                                                   memo.text¤È¤Ê¤ê¤Þ¤¹¡£
     <% end %>
   <% end %>
     <td><%= link_to _('Show'), :action => 'show', :id => memo %></td>
     <td><%= link_to _('Edit'), :action => 'edit', :id => memo %></td>
     <td><%= link_to _('Destroy'), { :action => 'destroy', :id => memo }, :confirm => _('Are you sure?'),  :method => :post %></td>
   </tr>
  <% end  %>
 </table >
 
 <%= link_to _('Previous page'), { :page => @memo_pages.current.previous } if @memo_pages.current.previous  %>
 <%= link_to _('Next page'), { :page => @memo_pages.current.next } if @memo_pages.current.next %>
 
 <br />
 
 <%= link_to _('New memo'), :action => 'new' %>
~
¡¡¡¡¡¡¡¡¢­~
¤µ¤é¤Ë¥í¥¸¥Ã¥¯Éôʬ¤ò¥Ø¥ë¥Ñ¡¼¥á¥½¥Ã¥É¤Ë³°½Ð¤·¤·¡¢ÆüÉÕ¤â½ñ¤­´¹¤¨
app\views\memos\list.rhtml
#pre{{
  ...
  <% for column in Memo.content_columns %>
    <td><%= format_column_value memo, column.name %></td>
  <% end %>
  ...
}}

app\helpers\memos_helper.rb
#pre{{
module MemosHelper
  # ¥á¥â¥ª¥Ö¥¸¥§¥¯¥È¤Î»ØÄꥫ¥é¥à¤òɽ¼¨ÍѤËÀ°·Á
  def format_column_value(memo, colname)
    if colname == 'location' && memo.location.index('http://') == 0
      link_to h(memo.location), memo.location
    elsif colname == 'created_at'
      memo.created_at.strftime '%Y-%m-%d %H:%M' if memo.created_at # ÆüÉդ⤳¤Î¤è¤¦¤ËÀ°·Á
    else
      h memo.send(colname)
    end
  end
end
}}


*step19 ¥â¥Ç¥ëÄɲÃÎã: źÉÕ¥Õ¥¡¥¤¥ë¤òɽ¤¹Attachment¥â¥Ç¥ë¤òÄɲä·¤Þ¤¹¡£
+¥â¥Ç¥ë¤òÀ¸À®
 C:\InstantRails\rails_apps\memopad>ruby script\generate model Attachment
       exists  app/models/
       exists  test/unit/
       exists  test/fixtures/
       create  app/models/attachment.rb
       create  test/unit/attachment_test.rb
       create  test/fixtures/attachments.yml
       exists  db/migrate
       create  db/migrate/003_create_attachments.rb ... ¥â¥Ç¥ë¤òÀè¤ËºîÀ®¤¹¤ë¤È¡¢¤³¤Î¤è¤¦¤Ë¥Æ¡¼¥Ö¥ë
                                                        ºîÀ®¡¦ºï½ü¤Îmigration¥Õ¥¡¥¤¥ë¤Ò¤Ê·Á¤¬ºî¤é¤ì¤Þ¤¹
+¥Õ¥£¡¼¥ë¥É¤òÄêµÁ~
db\migrate\003_create_attachments.rb
 class CreateAttachments < ActiveRecord::Migration
   def self.up
     create_table :attachments do |t|
       t.column :memo_id, :integer                   # ¤³¤Î¤è¤¦¤ËÄɲä·¤Þ¤¹
       t.column :name, :string, :limit => 64
       t.column :size, :integer
       t.column :content_type, :string, :limit => 64
       t.column :content, :mediumblob
     end
   end
 
   def self.down
     drop_table :attachments                         # Àè¤Ë¥â¥Ç¥ë¤òÀ¸À®¤¹¤ë¤È¡¢¤³¤Î¤è¤¦¤Ë¥Æ¡¼¥Ö¥ë
                                                     # ºï½ü¤â¼«Æ°¤ÇÆþ¤Ã¤ÆÊØÍø¤Ç¤¹
   end
 end
+migration¼Â¹Ô~
rake db:migrate
+»Ò¦¡§Attachment¥â¥Ç¥ë¤Ë¸¡¾Ú¡¢belongs_to¥á¥½¥Ã¥É¡¢¥á¥¿¥Ç¡¼¥¿¼èÆÀ¥á¥½¥Ã¥É¤òÄɲÃ~
app\models\attachment.rb
#pre{{
class Attachment < ActiveRecord::Base
  # ¸¡¾Ú½èÍý
  validates_presence_of :name, :size, :content_type, :content

  # memo¥ª¥Ö¥¸¥§¥¯¥È¤Ë½ê°¤¹¤ë¤³¤È¤òÀë¸À
  # ¤³¤ì¤Ë¤è¤Ã¤Æ¤³¤Î¥¯¥é¥¹¤«¤é¿ÆMemo¤Î°À­¤¬»ÈÍѤǤ­¤Þ¤¹
  # memo¤Ïñ¿ô¤Ê¤Î¤Çñ¿ô·Á¤Ç¤¹¡£
  belongs_to :memo

  # ¥á¥¿¥Ç¡¼¥¿¥«¥é¥à̾
  #   źÉÕ¥Õ¥¡¥¤¥ë¼«¿È°Ê³°¡¢¤¹¤Ê¤ï¤ÁÍÆÎ̤¬¾®¤µ¤¤¥«¥é¥à¤Î¥«¥é¥à̾¤Ç¤¹¡£
  METADATA_COLUMNS = 'id, memo_id, name, size, content_type'

  # Memo¥ª¥Ö¥¸¥§¥¯¥È¤ò»ØÄꤷ¤Æ¡¢ÅºÉÕʪ¥á¥¿¥Ç¡¼¥¿ÇÛÎó¤Î¼èÆÀ¤Î¥á¥½¥Ã¥É
  # @param ¿Æ¤ÎMemo¥ª¥Ö¥¸¥§¥¯¥È
  # @return źÉÕʪ¥á¥¿¥Ç¡¼¥¿ÇÛÎó
  # Î㡧arMeta = Attachment.metadatas memos(objMemo)
  #     puts arMeta.size
  #     if (arMeta.size > 0)
  #       puts arMeta[0].memo_id
  #     end
  def self.metadatas(memo)
    find :all, :select => METADATA_COLUMNS,
        :conditions => ['memo_id = ?', memo.id]
  end

  # źÉÕʪid¤«¤é¥á¥¿¥Ç¡¼¥¿¼èÆÀ¤Î¥á¥½¥Ã¥É
  # @param źÉÕʪid
  # @return ¤½¤Îid¤ò»ý¤ÄźÉÕʪ¥á¥¿¥Ç¡¼¥¿
  def self.metadata(id)
    find id, :select => METADATA_COLUMNS
  end
end
}}
+¿Æ¦¡§Memo¥â¥Ç¥ë¤Ëhas_many¥á¥½¥Ã¥É¤òÄɲÃ~
#pre{{
class Memo < ActiveRecord::Base
  validates_presence_of :text, :location
  validates_length_of :location, :maximum => 256

  # attachments¥ª¥Ö¥¸¥§¥¯¥È¤òÊ£¿ô»ý¤Á¡¢:select¤Ç»ØÄꤷ¤¿¥«¥é¥à¤Ë¥¢¥¯¥»¥¹¤Ç¤­¤ë¤³¤È¤òÀë¸À
  # attachments¤ÏÊ£¿ô¤Ê¤Î¤ÇÊ£¿ô·Á¤Ç¤¹¡£
  # Â裲°ú¿ô¤Ë¤Ï:order¤Ê¤Éfind¥á¥½¥Ã¥É¤ÈƱ¤¸°ú¿ô¤ò»ØÄê¤Ç¤­¤Þ¤¹¡£
  has_many :attachments, :select => Attachment::METADATA_COLUMNS

  def self.bookmarks
    find :all, :conditions => "location like 'http://%'", :order => "created_at DESC"
  end
end
}}



*step20 źÉÕ¥Õ¥¡¥¤¥ë¤Î¥¢¥Ã¥×¥í¡¼¥É
**¥Ó¥å¡¼½ñ¤­´¹¤¨
app\views\memos\new.rhtml
#pre{{
<h1><%=h _('New memo')%></h1>

<% form_tag ({:action => 'create'}, :multipart => true) do %> ... multipart¤òÀßÄê
  <%= render :partial => 'form' %> ... ¤³¤ì¤Ï¸µ¤«¤é¤¢¤ë¥½¡¼¥¹¤Ç¡¢_form.rhtml¤òÆɤ߹þ¤ß¤Þ¤¹
  <p>
    <label for="file"><%=h _('Attachment') %><label><br />    ... ¥é¥Ù¥ë
    <%= file_field_tag 'file' %>                              ... ¥Õ¥¡¥¤¥ë̾ÆþÎϤȻ²¾È¥Ü¥¿¥ó
  </p>
  <%= submit_tag _("Create") %>
<% end %>

<%= link_to _('Back'), :action => 'list' %>
}}



**źÉÕ¥Õ¥¡¥¤¥ëÆþ¤ê¤Ç¥â¥Ç¥ëÀ¸À®
app\controllers\memos_controller.rb
#pre{{
  ...
  def create
    @memo = Memo.new(params[:memo])
    if params[:file] && params[:file].respond_to?(:original_filename)
      # create¥¢¥¯¥·¥ç¥ó¤Ëfile¥Ñ¥é¥á¡¼¥¿¤¬Æþ¤Ã¤Æ¤¤¤¿¤È¤­¤Î½èÍý
      @memo.attachments.create :name => params[:file].original_filename,
        :size => params[:file].length,
        :content_type => params[:file].content_type,
        :content => params[:file].read
    end
    
    if @memo.save
      flash[:notice] = _('Memo was successfully created.')
      redirect_to :action => 'list'
    else
      render :action => 'new'
    end
  end
  ...
}}



*step21 źÉÕ¥Õ¥¡¥¤¥ëɽ¼¨Éôʬ¤òÄɲÃ
**¥ë¡¼¥Æ¥£¥ó¥°¤ÎÀßÄê
config\routes.rb~
¼¡¤ÎÀèƬ£²¹Ô¤òÄɲÃ
  map.connect ':controller/:action/:id/:filename.:fileext'
  map.connect ':controller/:action/:id/:filename'
  map.connect ':controller/:action/:id.:format'
  map.connect ':controller/:action/:id'



**¥á¥â¤Îɽ¼¨¤ËźÉÕ¥Õ¥¡¥¤¥ë¥ê¥¹¥Èɽ¼¨
app\views\memos\show.rhtml
#pre{{
...
<% if !@memo.attachments.empty? %>
  <b><%=h _('Attachments') %>:</b>
  <table border="1">
    <tr>
      <% for column in @memo.attachments.content_columns %>
        <th><%= column.human_name %></th>
      <% end %>
    </tr>
    <% for attachment in @memo.attachments %>
      <tr>
        <% for column in @memo.attachments.content_columns %>
          <td><%= format_column_value attachment, column.name %></td>
        <% end %>
      </tr>
    <% end %>
  </table>
<% end %>
...
}}



**¥í¥¸¥Ã¥¯Éôʬ¤Ï¥Ø¥ë¥Ñ¡¼¤Ëµ­½Ò
app\helpers\memos_helper.rb
#pre{{
module MemosHelper
  # ¥ª¥Ö¥¸¥§¥¯¥È¤Î»ØÄꥫ¥é¥à¤òɽ¼¨ÍѤËÀ°·Á
  def format_column_value(ar, colname)
    if Memo === ar
      format_memo_column_value ar, colname
    elsif Attachment === ar
      format_attachment_column_value ar, colname
    end
  end

  # ¥á¥â¥ª¥Ö¥¸¥§¥¯¥È¤Î»ØÄꥫ¥é¥à¤òɽ¼¨ÍѤËÀ°·Á
  def format_memo_column_value(memo, colname)
    ...
  end

  # źÉÕ¥ª¥Ö¥¸¥§¥¯¥È¤Î»ØÄꥫ¥é¥à¤òɽ¼¨ÍѤËÀ°·Á
  def format_attachment_column_value(atch, colname)
    if colname == 'content'
      if atch.content_type =~ /image\/(x-|p)?(jpe?g|png|gif)/
        image_tag url_for(:action => 'file', :id => atch.id, :filename => atch.name), :alt => h(atch.name)
      else
        link_to h(atch.name), {:action => 'file', :id => atch.id, :filename => atch.name}
      end
    else
      h atch.send(colname)
    end
  end
  ...
end
}}



**file¥¢¥¯¥·¥ç¥ó¤ÎÄɲÃ
app\controllers\memos_controller.rb
#pre{{
  ...
  def file
    attachment = Attachment.find params[:id]
#    return if forbidden?(attachment.memo)
    filename = (params[:fileext]) ? "#{params[:filename]}.#{params[:fileext]}" : params[:filename]
    if filename != attachment.name
      render :file => File.join(RAILS_ROOT, 'public', '404.html'), :status => 404, :layout => true
    else
      disposition = 'inline'
      send_data attachment.content, :filename => attachment.name, :type => attachment.content_type, :disposition => disposition
#      cache_page if attachment.memo.public_memo
    end
  end
  ...
}}