Recently, I begin to read the source code of rails to learn more about the internal workings and design patterns of this framework.
From time to time, I found I might want to discuss the way things are written. Is there a dedicated group or irc channels for this sort of discussion?
Yeah sure, there's an IRC channel where you can ask these kind of
questions. Check out the page on http://rubyonrails.org/community (the
official Rails site) for more information. There's also a group on
Google available for this.
I would just ask the question here. If there is some dedicated group, they will probably answer here and then maybe invite you to join their specialized group. Or you could always start your own.