Awesome video. I didn't know about the classify method, I'd been leaning on camelize or more manual conversions if it didn't deal with pluralization gracefully. Which is silly, because they're all right here: http://api.rubyonrails.org/...
Maybe worth noting these are provided by Rails/not in regular Ruby? Who knows.
Ideas for future episodes: are there any parts of Rails that you've traditionally found useful to pull out into PORO's? (I'm mainly thinking of ActiveModel, but really anything.) Sort of a generic question: what makes blocks useful? When would you want to use a block with .call here instead of regular arguments? Lastly, where might an ActiveRecord::Attribute be used for cases like this?