d2

A cross-version compatible shortcut for invoking a Ruby debugger that always tries to do the right thing™ no matter which platform you're running under.

This gem is a trivial layer built upon the hard work of giants, and I sure wouldn't blame you if you preferred not to use it. See the alternative pattern in my article about cross-version debugging in Ruby.

Drop d2 into your Gemfile:

group :development, :test do
  gem "d2"
end

Make sure you're using Bundler.require somewhere in your project (Rails does this automatically), or include a require 'd2' somewhere (like in your test_helper.rb).

You're ready to go:

def requires_frequent_debugging
  risky_call rescue nil
  Singleton.manipulate_global_state
  d # drop me here!
  Model.do_business_logic
  super
end