Looking for best practices on architecting Rails applications.

I'm new to Rails though I've been developing system software (C/C++) for 5+ years now.<p>I'm learning Rails through building an application that is similar to Twitter but which charges for each post (I know this is contrived, but it's the next step from a simplistic example application for me). I'm hoping this will teach me about authentication, integration with OAuth APIs, payment processing and overall Rails development.<p>I have been going through the http://www.railstutorial.org book and it's been very very helpful in understanding Rails basics. However, I am constantly hung up on how to either integrate various gems (i.e. devise) or create my own functionality within Rails architecture.<p>What are some resources people here would recommend for transitioning from a novice Rails dev to an intermediate Rails dev? I'm looking for guides, how-to's, etc. on architecture and patterns for developing an application using Rails; something that will talk about real-world experience(s). Don't get me wrong, I like going through the made-up examples as a complete novice, I need that to be comfortable with the language/framework/API, but what comes after that?<p>Thank you