[更新]MacでRuby on Rails開発：環境構築から

MacにはデフォルトでRubyが入ってそうです。
ターミナルを開いてrails -vを叩いたらバージョン情報が出てきました。

ruby 1.8.7 (2009-06-08 patchlevel 173) *universal-darwin10.0*

そしてRubyだけじゃなくRailsも入ってましてびっくりしました。
すごいですねMacは。。。
て、railsのバージョンもrails -vで確認できますが、
デフォルトのバージョンは古いそうで下記のコマンドでアップグレードできます。

sudo gem update rails

するとこんなログ情報が出ます。

Updating installed gems
Updating rails
WARNING:  Installing to ~/.gem since /Library/Ruby/Gems/1.8 and
      /usr/bin aren't both writable.
WARNING:  You don't have /Users/zolo/.gem/ruby/1.8/bin in your PATH,
      gem executables will not run.
Successfully installed activesupport-2.3.8
Successfully installed activerecord-2.3.8
Successfully installed rack-1.1.0
Successfully installed actionpack-2.3.8
Successfully installed actionmailer-2.3.8
Successfully installed activeresource-2.3.8
Successfully installed rails-2.3.8
Gems updated: activesupport, activerecord, rack, actionpack, actionmailer, activeresource, rails
Installing ri documentation for activesupport-2.3.8...
Installing ri documentation for activerecord-2.3.8...
Installing ri documentation for rack-1.1.0...
Installing ri documentation for actionpack-2.3.8...
Installing ri documentation for actionmailer-2.3.8...
Installing ri documentation for activeresource-2.3.8...
Installing ri documentation for rails-2.3.8...
Installing RDoc documentation for activesupport-2.3.8...
Installing RDoc documentation for activerecord-2.3.8...
Installing RDoc documentation for rack-1.1.0...
Installing RDoc documentation for actionpack-2.3.8...
Installing RDoc documentation for actionmailer-2.3.8...
Installing RDoc documentation for activeresource-2.3.8...
Installing RDoc documentation for rails-2.3.8...

多少時間がかかります。
これでMacでのRuby開発の準備は完了です。

更新

gem update railsにsudoを付けないとこんなエラーが出るかも

WARNING:  Installing to ~/.gem since /Library/Ruby/Gems/1.8 and
      /usr/bin aren't both writable.
WARNING:  You don't have /Users/paku-k/.gem/ruby/1.8/bin in your PATH,
      gem executables will not run.
ERROR:  Error installing rails:
    bundler requires RubyGems version >= 1.3.6