https://topfunky.com/
Geoffrey Grosenbach - Topfunky Blog
geoffreyblog
https://www.lulu.com/shop/geoffrey-grosenbach/the-topfunky-field-guide-to-ruby-on-rails/paperback/product-195nrk2.html
the Topfunky Field Guide to Ruby on Rails
An extensive cheat sheet for learning about Ruby on Rails.
field guiderubyrails