Josh is right. ActiveRecord, MVC, Front Controller(router + ActionDispatch), Template View(ERB) as well as a lot of what works under the hood in ActiveRecord comes from that book.

Though when I mean conventions I also mean where files are placed, how tables and fields are named, how migrations work and how DRY is part of the framework through and through.

A Loco app doesn't require fiddling with the database at all to replace its Rails counterpart. Hence why this naming of project confused me.