MongoDB has two popular ORMs for Rails: MongoID and MongoMapper.
Are there CouchDB ORM:s for Rails 3?
MongoDB has two popular ORMs for Rails: MongoID and MongoMapper.
Are there CouchDB ORM:s for Rails 3?
I can't say for sure since I've never used it, but it looks like CouchRest would be the way to go - specifically "CouchRest Model" looks like has been updated to work with Rails3 ActiveModel.
FWIW, I landed on CouchRest after finding this thread.
there is couchRest as noted above, or if you like active record style try couch_foo. I had different needs when i was looking into couch this past spring, and using rails 3. Rails 3 should be ORM agnostic, so it shouldn't really mess with it, although I couldn't get testing to work easily, but that could have just been me.