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Re:Building a MongoDB Clone in Postgres by mark_l_watson on Monday June 04, 2012 @04:09PM (#4065709)
I agree: Mongoid is great.

I haven't done this in a few years, but Datamapper had the nice capability to map a singe model classes to multiple backends (e.g., use PostgreSQL for some attributes, MongoDB for others).

PostgreSQL and MongoDB cover most of my data store requirements and are a pleasure to use.

Re:Building a MongoDB Clone in Postgres by semiquaver on Monday June 04, 2012 @05:39PM (#4066105)
I use datamapper pretty extensively to join mysql tables with mongodb collections, but I've always used associations between several models to do this. Do you have any links talking about this capability?