(MacOSX10.8, Ruby2.0, Rail4rc1)
以下、チュートリアルをする環境を整える
$ cd ~/.rbenv/plugins/ruby-build/ $ sudo git pull $ sudo rbenv install 2.0.0-p195 $ mkdir rails4_test $ cd rails4_test $ rbenv local 2.0.0-p195 $ ruby -v ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin12.3.0] $ sudo gem install bundler $ sudo gem install rake $ sudo gem install rails --pre --no-ri --no-rdoc $ rails new rails4_test -T $ rails generate scaffold Book title price:integer $ rake db:migrate $ rails s