Most Popular MongoDB Ruby libs Compared: MongoMapper and Mongoid
Useful information for MongoDB users in the Ruby-land:
At first glance, Mongoid and MongoMapper seem to take similar approaches and have very similar APIs, […] it turns out they have different motivations, aims, and, underneath it all, they target different use cases pretty well.
via: http://www.rubyinside.com/mongoid-vs-mongomapper-two-great-mongodb-libraries-for-ruby-3432.html