GemSetsについて
GemSetsとは，
"rvm gemdir"コマンドを使うことで，
% rvm gemdir /Users/takkanm/.rvm/gems/ruby-1.8.7-p249
GemSetsを使用するとRubyGemsがインストール，
% rvm gemset list
gemsets : for ruby-1.8.7-p249 (found in /Users/takkanm/.rvm/gems/)
global
globalは，
それでは，
% rvm gemset create rails2
Gemset 'rails2' created.
% rvm gemset list
gemsets : for ruby-1.8.7-p249 (found in /Users/takkanm/.rvm/gems/)
global
rails2
作成したGemSetsを使用するには，
% rvm gemdir
/Users/takkanm/.rvm/gems/ruby-1.8.7-p249
% rvm gemset use rails2
Now using gemset 'rails2'
% rvm gemdir
/Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails2
もしくは"rvm use"を使用する際に，
% rvm use 1.8.7-p249@rails2
Using ruby 1.8.7 p249 with gemset rails2
また，
% rvm --create use 1.8.7-p249@rails3 Using ruby 1.8.7 p249 with gemset rails3 % rvm gemset list gemsets : for ruby-1.8.7-p249 (found in /Users/takkanm/.rvm/gems/) global rails2 rails3
使用するGemSetsを変更すると，
% rvm use 1.8.7-p249@rails2 Using ruby 1.8.7 p249 with gemset rails2 % rvm gemdir /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails2 % echo $GEM_PATH /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails2:/Users/takkanm/.rvm/gems/ruby-1.8.7-p249@global % echo $GEM_HOME /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails2 % rvm use 1.8.7-p249@rails3 Using ruby 1.8.7 p249 with gemset rails3 % rvm gemdir /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails3 % echo $GEM_PATH /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails3:/Users/takkanm/.rvm/gems/ruby-1.8.7-p249@global % echo $GEM_HOME /Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails3
Rails2とRails3の共存
それでは，
最近，
まず，
% rvm use 1.8.7-p249@rails2
Using ruby 1.8.7 p249 with gemset rails2
% gem install rails
Successfully installed activesupport-2.3.5
Successfully installed activerecord-2.3.5
Successfully installed rack-1.0.1
Successfully installed actionpack-2.3.5
Successfully installed actionmailer-2.3.5
Successfully installed activeresource-2.3.5
Successfully installed rails-2.3.5
7 gems installed
% rails -v
Rails 2.3.5
% which rails
/Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails2/bin/rails
次に，
% rvm use 1.8.7-p249@rails3
Using ruby 1.8.7 p249 with gemset rails3
% gem install rails3b
Successfully installed activesupport-2.3.5
Successfully installed mime-types-1.16
Successfully installed polyglot-0.3.1
Successfully installed treetop-1.4.5
Successfully installed mail-2.1.5.3
Successfully installed text-hyphen-1.0.0
Successfully installed text-format-1.0.0
Successfully installed rack-1.1.0
Successfully installed rack-test-0.5.3
Successfully installed rack-mount-0.4.7
Successfully installed abstract-1.0.0
Successfully installed erubis-2.6.5
Successfully installed i18n-0.3.7
Successfully installed tzinfo-0.3.19
Successfully installed builder-2.1.2
Successfully installed memcache-client-1.7.8
Successfully installed bundler-0.9.21
Successfully installed thor-0.13.4
Successfully installed rails3b-3.0.1
19 gems installed
% gem install rails --pre
Successfully installed activesupport-3.0.0.beta3
Successfully installed activemodel-3.0.0.beta3
Successfully installed rack-mount-0.6.3
Successfully installed actionpack-3.0.0.beta3
Successfully installed arel-0.3.3
Successfully installed activerecord-3.0.0.beta3
Successfully installed activeresource-3.0.0.beta3
Successfully installed mail-2.2.0
Successfully installed actionmailer-3.0.0.beta3
Successfully installed railties-3.0.0.beta3
Successfully installed rails-3.0.0.beta3
11 gems installed
% rails -v
Rails 3.0.0.beta3
% which rails
/Users/takkanm/.rvm/gems/ruby-1.8.7-p249@rails3/bin/rails
ここで，
% rvm use 1.8.7-p249@rails2
Using ruby 1.8.7 p249 with gemset rails2
% rails -v
Rails 2.3.5
おわりに
今回は，
RVMは，
- 複数のRubyでRakeタスクを実行する
- 複数のRuby でベンチマークをとる
- 複数のRubyでプロファイルをとる
- GemSetsのインポート/エクスポート
RVM は英語ではありますがドキュメントがしっかししているので，
ぜひRVMを使って，