If you've already done this backwards, there is a book called Ruby for Rails that teaches advanced Ruby from the point of view that you already use Rails but ha

If you've already done this backwards, there is a book called Ruby for Rails that teaches advanced Ruby from the point of view that you already use Rails but haven't been able to get very far into the source. A bit outdated, but still pretty good stuff. (http://www.manning.com/black/ http://www.manning.com/black/)