Homework application for students and teachers Environment Ubuntu 11.10 Rails 3.1.1 ruby 1.9.3p6 (2011-12-20 revision 34080) [i686-linux] (This will have Chinese problem and need magic_encoding which can solve it) or ruby 1.8.7 (2011-02-18 patchlevel 334) [i686-linux] gem version 1.8.11 Bundler version 1.0.21 Installation bundle install rake db:migrate