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I'd also suggest Jeremy's book Polished Ruby[1]. It's excellent IMHO. 1. https://www.oreilly.com/library/view/polished-ruby-programming/9781801072724/ https:

• scruple 5y ago
  I no longer write Ruby professionally but in my last 18-24 months of Ruby work I leaned heavily on some of Jeremy's excellent work with roda, sequel, and others (forme, erubi, rack-unreloader, etc.). Top notch work, truly. I had no idea that he had written a book, thanks for pointing that out, and I'll definitely be picking a copy up.