agoragames/activity_feed — pull request #8 by hypomodern (2012-08-13 15:29:52+00:00)
Title: In comments, you will find the mongoid 3.x updates to make the tests run...

I'm not sure how you want to handle different versions, but I wanted to let you know what you'll need to change. Also DatabaseCleaner >= 0.8.x.