Ruby

JRuby as a Java Obfuscation Utility
Dynamic properties in Ruby

Rails

Rails authentication with devise and cancan – Customizing Devise Controllers
Cleaner RESTful Controllers with respond_with
Convert a Sqlite DB to MySQL? (in Rails world)

Ruby Tips

My .irbrc file

require 'pp'
require 'irb/completion'
require 'irb/ext/save-history'
require 'rubygems'
require 'wirble'

Wirble.init
Wirble.colorize

IRB.conf[:SAVE_HISTORY] = 500
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-history"
IRB.conf[:AUTO_INDENT] = true

Don't forget to install the wirble gem.

How to painlessly remove all gems

root:~# gem list | cut -d" " -f1 | xargs gem uninstall -aIx

How to prevent installing rdoc and ri files with gems

In ~/.gemrc file you need to add following line:

gem: --no-ri --no-rdoc