golf on rails

this book is undergoing a major rewrite. 

the latest draft is in https://docs.google.com/document/d/1sjekmpdJhd7zrmkCeRQdIKL6xbvX0N7z/edit?usp=sharing&ouid=107410195113279687096&rtpof=true&sd=true

(for more of my knowledge bombs, click the "ian's knowledge bombs" banner at the top of this article and choose any article in the table of contents that piques your interest)