Dissecting Ruby with Ruby

Presenter: Richard Schneeman, @scheneems

Bio

• Works at Heroku Austin, write the gem sextant
• Get involved with open source. CodeTriage
• schneems.com/ut-rails

Summary

• Some Ruby tricks that enable you to understand codebase faster
• A very good way to keep track of issues for open source projects: http://www.codetriage.com/

Notes

1. Ruby Method class helps track down source location.

   Given we have a class called Person which is defined in some mysterious location..

   p = Person.new p.method(:greetings).source_location

2. Use ancestor_classes

   What if we have multiple locations where methods are deinfed?

   i.e. super everywhere?

   Person.instance_method(:some_method_defined_somewhere).source_location self.class.ancestors do |klass| next unless klass.method_defined?(:some_method_defined_somewhere) puts klass.method(:some_method_defined_somewhere).source_location end end

3. Try to figure out where a method got called?

   def where_is_this_called? caller.inspect end

External Links

Ruby Method class