An Intervention for ActiveRecord by Ernie Miller
https://speakerdeck.com/erniemiller/an-intervention-for-activerecord
Crafting Gems: RailsConf 2013 by Pat Allan
https://speakerdeck.com/pat/crafting-gems-railsconf-2013
Magic Tricks of Testing (RailsConf) by Sandi Metz
https://speakerdeck.com/skmetz/magic-tricks-of-testing-railsconf
Rails is Just Ruby by Jesse Wolgamott