在CouchDB上实现用户评级/收藏夹

I'm considering using CouchDB for an upcoming site, but I'm a little confused as far as far as how to implement a system of user ratings for the site. Basically, each item of content can be rated by a given user. What way of doing this makes the most sense in the CouchDB model? I would think the DRYest and most logical way would be to have 3 different document types, Content, Users, and a user_rating doc that looks something like this.I'm considering using CouchDB for an upcoming s