The beginner-level stuff is bountiful but I am having trouble tracking down anything beyond the basics. Could anyone list/link where do you go for more advanced how-to's with Ruby on Rails and/or some opensource projects that are readable and "best practices"-like?
http://rebuilding-rails.com/ by Noah Gibbs is a nice resource if you find it helpful to understand things at a lower layer of abstraction. It is particularly useful for giving you the background that you can do something like replacing controllers with middlewares in order to increase modularity/testability (see https://gocardless.com/blog/coach/).
