Ruby Developer Notes Useful things

Cross version Ruby debug with ruby-debug-wrapper

When you debuging Rails 3 application (which uses Bundler) and trying different ruby versions with RVM you have following problem: you should switch your Gemfile between ruby-debug and ruby-debug19 gems to work with 1.8 and 1.9 Rubies. ruby-debug-wrapper gem solves the problem.

Follow this steps:

1. Install ruby-debug gem for each ruby version you will use. For example:
   [cc lang="bash" width="670"]
   # rvm use system
   # gem install ruby-debug
   # rvm use ree@rails3
   # gem install ruby-debug -- --with-ruby-include=$rvm_path/src/ree-1.8.7-2010.02/
   # rvm use ruby-1.9.2-head@rails3
   # gem install ruby-debug19 -- --with-ruby-include=$rvm_path/src/ruby-1.9.2-head/
   [/cc]
2. Add to Gemfile following line
   [cc lang="ruby"]
   gem 'ruby-debug-wrapper', :group => :development
   [/cc]
3. Run bundler
   [cc lang="bash"]
   # bundle install
   [/cc]
4. Now you can run server with debugger and switch ruby version without changing Gemfile each time:
   [cc lang="bash"]
   # rvm use system
   # script/rails s -u
   # rvm use ree@rails3
   # script/rails s -u
   # rvm use ruby-1.9.2-head@rails3
   # script/rails s -u
   [/cc]

Possibly my solution is still raw. So waiting for your comments and bug reports. Hope this can save few minutes to someone.

P.S.
Few days after i have found more simpler solution. You can just include following lines to your Gemfile:
[cc lang="ruby"]
if RUBY_VERSION < '1.9' gem 'ruby-debug' else gem 'ruby-debug19' end [/cc] So i was on the wrong way. 🙂