Where can I find UML for RoR itself? with ActiveRecord classes, etc. If there is nobody, advise me how to do it faster and better. Do I just have to read sources or something else?
not sure about ROR itself, but you can check RailsRoad to build your UML application
If your application is Rails 3, use RailsRoady instead. You can find it here .
RailsRoady