以前は、Railsのhelperメソッドのオプションや細かい挙動を調べるために、 secondlifeさんの http://api.rails2u.com/ や、 :::ruby.search::: のお世話になることが多かったのですが、 近頃ではRailsのドキュメントを参照する機会が減ってきました。

細かい理由はいろいろあるのですが、一番大きいのは、 以前紹介したRak を使って直接Railsのソースを確認するのが便利な事です。

使い方はこんな感じです。

• vendor/rails以下にRailsをfreezeさせます。
• GNU screenでcd vendor/railsしたスクリーンを用意しておきます。
• 何か調べたいときは、rak def\ method_nameを実行して、出てきたファイルをvimで読む。
• Rtags（rails.vimの機能）でジャンプもできる。

さらに、細かい挙動やメソッドに渡ってきた値を調べたい時などは、 vendor/railsのソースにdebuggerと書き込んで、 script/server -uでデバッグモードを起動します （「Rails 2.0でデバッグをする新しいやり方」参照）

apt-get install git-coreですんなり終わるかと思っていたら、 GNU Interactive Toolsというのと競合してるらしく、 以下のようなメッセージが出てきます。

   1  git, the filemanager with GNU Interactive Tools, is now called gitfm.
   2  
   3  If you are looking for git, Linus Torvald's content tracker, install
   4  the cogito and git-core packages and see README.Debian and git(7).
   5  
   6  This transition script will be removed in the debian stable
   7  release after etch.
   8  
   9  If you wish to complete the transition early, install git-core
  10  and use (as root):
  11   update-alternatives --config git
  12  
  13  Press RETURN to run gitfm

指示の通り、update-alternatives --config gitを実行すると、 今度はこんな感じのメッセージが出るので、

   1  # update-alternatives --config git
   2  
   3  There are 2 alternatives which provide `git'.
   4  
   5    Selection    Alternative
   6  -----------------------------------------------
   7  *+        1    /usr/bin/git.transition
   8            2    /usr/bin/git-scm
   9  
  10  Press enter to keep the default[*], or type selection number: 

2の/usr/bin/git-scmを選択します。

これでGitを使えるようになりました。

技術評論社さま、献本ありがとうございます。

WEB+DB PRESS Vol.43

posted with amazlet on 08.02.28

WEB+DB PRESS編集部
技術評論社 (2008/02/23)
売り上げランキング: 122

Amazon.co.jp で詳細を見る

今号は連載の最終回が多いですね。季節を感じる一冊です。

個人的に面白かったのは、

• 弾さんの「Alpha Geekに逢いたい」（TwitterのEvan Williams氏）
• masuidriveさんの「Amazon EC2&S3」（素晴らしい内容）
• ひろせさんの「見逃さない通知の極意」

ですね。参考にさせていただきます。

OpenIdAuthenticationはruby-openid1.1.4にしか対応していません。ですが、gem1.0.1では1.1.4が正しく動作しないため、プラグインにパッチをあてて使うことにしました。

1. ruby-openidをインストール(2.0.4)

      1  gem install ruby-openid
   

2. pluginのインストール

      1  $ ./script/plugin install http://svn.rubyonrails.org/rails/plugins/open_id_authentication/
   

3. パッチをあてる

   • パッチを入手ticket10604.diffとして保存
     http://dev.rubyonrails.org/ticket/10604

   • プラグインのところに移動させておく
     

        1   #{RAILS_ROOT}/vendor/plugins/open_id_authentication/ticket10604.diff
     

   • プラグインのルートに移動して、patchを当てる

        1  $ patch -p1 < ticket10604.diff
        2  patching file init.rb
        3  Hunk #1 FAILED at 1.
        4  1 out of 1 hunk FAILED -- saving rejects to file init.rb.rej
        5  patching file lib/generators/open_id_authentication_tables/open_id_authentication_tables_generator.rb
        6  patching file lib/generators/open_id_authentication_tables/templates/migration.rb
        7  patching file lib/open_id_authentication.rb
        8  Hunk #5 succeeded at 69 with fuzz 1 (offset -2 lines).
        9  Hunk #6 succeeded at 88 (offset -2 lines).
       10  Hunk #7 succeeded at 152 (offset -2 lines).
       11  patching file lib/open_id_authentication/association.rb
       12  patching file lib/open_id_authentication/db_store.rb
       13  patching file lib/open_id_authentication/nonce.rb
       14  patching file lib/open_id_authentication/setting.rb
       15  patching file tasks/open_id_authentication_tasks.rake
       16  patching file test/normalize_test.rb
       17  patching file test/open_id_authentication_test.rb
       18  patching file test/status_test.rb
     

4. READMEにあるExampleの作業

   • テーブル作成

        1   rake open_id_authentication:db:create 
     

   • routesに下記を加える

        1    map.open_id_complete 'session', :controller => "sessions", :action => "create", :requirements => { :method => :get }
        2    map.resource :session
     

   • SessionsController、vews/sessions/new.html.erbの作成
     ここでmatakeさんと同じようにはまったのですが、SessionConroller#open_id_authenticationをREADMEにあるresult.successful?のほうを使うとプラグインに手を入れずに使うことができます。(agilewebdevelopment.comのExampleを使うとNG)

        1      def open_id_authentication
        2        authenticate_with_open_id do |result, identity_url|
        3          if result.successful? && @current_user = @account.users.find_by_identity_url(identity_url)
        4            successful_login
        5          else
        6            failed_login(result.message || "Sorry, no user by that identity URL exists (#{identity_url})")
        7          end
        8        end
        9      end
     

5. ruby-openidのバージョン指定をはずす

      1  #open_id_authentication/init.rb
      2  begin
      3  #  gem 'ruby-openid', '=1.1.4'
      4    gem 'ruby-openid'
   

参考

• http://koress.jp/2008/01/_open_id_authenticationrails_2.html
• http://railspress.matake.jp/openidauthentication-plugin%E3%81%AE%E3%82%B5%E3%83%B3%E3%83%97%E3%83%AB%E3%81%AB%E3%81%AF%E3%81%BE%E3%81%A3%E3%81%9F%E3%80%82

OpenIdAuthentication is depend on gem ruby-openid 1.1.4. In addition, ruby-openid 1.1.4 is broken with 1.0.1 gem :(
So, I applied patch(Ticket#10604) and they works well.

1. Install gem ruby-openid(2.0.4)

      1  gem install ruby-openid
   

2. Install plugin

      1  $ ./script/plugin install http://svn.rubyonrails.org/rails/plugins/open_id_authentication/
   

3. Apply patch

   • Get a patch and save as ticket10604.diff
     http://dev.rubyonrails.org/ticket/10604

   • Move diff file to plugin root

        1   #{RAILS_ROOT}/vendor/plugins/open_id_authentication/ticket10604.diff
     

   • Move to plugin root and do patch command

        1  $ patch -p1 < ticket10604.diff
        2  patching file init.rb
        3  Hunk #1 FAILED at 1.
        4  1 out of 1 hunk FAILED -- saving rejects to file init.rb.rej
        5  patching file lib/generators/open_id_authentication_tables/open_id_authentication_tables_generator.rb
        6  patching file lib/generators/open_id_authentication_tables/templates/migration.rb
        7  patching file lib/open_id_authentication.rb
        8  Hunk #5 succeeded at 69 with fuzz 1 (offset -2 lines).
        9  Hunk #6 succeeded at 88 (offset -2 lines).
       10  Hunk #7 succeeded at 152 (offset -2 lines).
       11  patching file lib/open_id_authentication/association.rb
       12  patching file lib/open_id_authentication/db_store.rb
       13  patching file lib/open_id_authentication/nonce.rb
       14  patching file lib/open_id_authentication/setting.rb
       15  patching file tasks/open_id_authentication_tasks.rake
       16  patching file test/normalize_test.rb
       17  patching file test/open_id_authentication_test.rb
       18  patching file test/status_test.rb
     

4. Do some work in README

   • Creating tables

        1   rake open_id_authentication:db:create 
     

   • Add some routes

        1  #config/routes.rb
        2    map.open_id_complete 'session', :controller => "sessions", :action => "create", :requirements => { :method => :get }
        3    map.resource :session
     

   • Generate SessionsController, and create vews/sessions/new.html.erb
     Tip:NOT to use sample code in agilewebdevelopment.com. Use sample code in README.

        1      def open_id_authentication
        2        authenticate_with_open_id do |result, identity_url|
        3          if result.successful? && @current_user = @account.users.find_by_identity_url(identity_url)
        4            successful_login
        5          else
        6            failed_login(result.message || "Sorry, no user by that identity URL exists (#{identity_url})")
        7          end
        8        end
        9      end
     

5. Ommit version of ruby-openid

      1  #open_id_authentication/init.rb
      2  begin
      3  #  gem 'ruby-openid', '=1.1.4'
      4    gem 'ruby-openid'
   

My name is Genki Takiuchi. I was born in Tokyo at 1980, so I am 27.

I've started programming when I was 8 years old. Simple games brought me to the world defined by BASIC. 20 years made me pass through many languages such as C/C++, HDL, HLSL, Java, D, Perl, Scheme, Erlang, Haskell and Ruby.

I won the Minister of Education prize at the programming contest in Japan when I was 19. I had studied concentratedly about computer graphics (photorealistic rendering) and statistics.

And now, I have worked with Ruby on Rails for more than 2 years. I wrote some articles to "WEB+DB press" and "Nikkei Software" which are magazines published in Japan.

I have a life work that is to solve the problem in the computer graphics.

このブログに英語（非常にbrokenですが）で書いている記事を、 今後はもう一つのブログの方に書くことにしました。

• English As A Programming Language

理由としては、複数の言語が混在しているのは読みにくいのでは ないかということと、別なブログとして英語のブログを作ることで 英語の勉強に気合を入れるためです。

ということで、よろしくお願いいたします。

I decided to separate entries into two blogs according to its language. This is the first entry which has written in English to this weblog.

I had decided learn about English about two years ago, but that is not achieved yet. The goal is so far. I want to communicate with cool programmers using English as a native or second language.

By the way, I plan to write something about Ruby on Rails, computer graphics (especially about offline rendering) and so on to this blog.

If you are familiar with Japanse, please visit "Hello, world!" the another weblog which is written Japanese.

Thank you.

At rev. 8929, I have found a good news for OpenID users.

http://svn.rubyonrails.org/rails/plugins/open_id_authentication/CHANGELOG

Tied plugin to ruby-openid 1.1.4 gem until we can make it compatible with 2.x [DHH]

Thanks DHH!

OoO workshop has been successfully held on last Sunday thanks to SGI Japan.

Syoyo, the founder of this event, had predicted the future of GPU in his presentation using a comparison of two charts which are about the Nikkei 225 index and the speed of GPU. Detail is here.

This is the most interesting prediction about GPU I ever met. Nowadays, CPU is speeding up much faster than GPU and its power consumption is still low against GPU's.

I think that FPGA can be a competitor of CPU rather than GPU in near future. The number of gates in FPGA has become very large so that it could be used for development of very complex processor such as Raytracing Processing Unit as known as RPU.