MongoDB and Rails
Ryan Bates has an excellent screencast on using MongoMapper, although he doesn’t mention testing. Despite this, setting up a Cucumber -based test environment is possible as long as you are careful about how you do it. Ben Scofield has published a very helpful Application template and Nicolas Mérouze has recently written up his Machinist adapter for MongoDB.
In fact, many Rails plugins depend on ActiveRecord and none of these will work with MongoMapper. I can’t use scaffolding and named scopes are not yet available either.
So, I am probably not quite ready to use MongoDB in my Rails applications yet. Maybe in a few months.