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Railscasts has been extremely helpful for me (http://railscasts.com/); and now all the content is free!

any issues with the railscasts videos being so outdated? i can't imagine much of the earlier stuff carries over

FWIW, I used to reference rails 3 features all the time when doing rails 4 development.

Also, maybe this was just my learning needs ... I was helped by seeing how an experienced rails dev handled business logic and UX features.