While looking for a good way to visualize ActiveRecord models, I stumbled upon Rails ERD. I followed the painless install process which is essentially involves adding a one-liner in bundler and installing Graphviz via the DMG, and fired off the associated Rails ERD rake task. 5 seconds later I had a readable, dynamically generated PDF of the database schema for my project. Hats off to Rolf Timmermans for this useful utility.
