Is it because you want to get the PR out before working on the next strategies? Just trying to understand the flow.

Yes, the PR is quite large already and I think we can add other strategies incrementally. Note that CouchDB doesn't have a notion of "collections" as Mongo does, so all documents are basically in one huge collection. I.e. the "collection per association" strategy can't be realized anyways. I've created OGM-389 for the "in entity" strategy.