Examples of medium-scale refactorings
The Rack Based A/B testing framework
Eighteen versions (gradually implemented) of a Web and REST API app made with Ruby on Rails that ...
a command line tool to help refactor your code
A collection of refinements for Ruby core classes with a compatibility mode for older Rubies and ...
pippi
after_do allows you to add simple callbacks to methods
Ruby Tricks, Idiomatic Ruby, Refactoring and Best Practices
Ruby Translation of Freeman & Pryce /Growing Object-Oriented Software, Guided by Tests/
Real World Rails applications and their open source codebases for developers to learn from
Levels up refactoring skills, in three engaging hours
Refactoring Workshop
Code to support using functional style in Ruby
Ruby core extensions repository (not a gem!)
SuperModule allows defining class methods and method invocations the same way a super class does ...
Literate Maruku is a literate programming libary for Ruby based on the Markdown libary Maruku.