I was doing a search for a way to invite users with devise The third link the Google machine returned (https://github.com/salex/rails3-Devise-BCSD-Can-Invite) was to a complete Basecamp style demo using devise, cancan, and devise invitable. I always checkout the author on interesting projects; I found the author is retired and a year older than my mom (and I'm no relative spring chicken at 35).