def mongo_property(db_name, index, field):
    """ Usage: stuff = mongo_property('myapp.stuff', 'pk', 'stuff') """

    import pymongo
    mongo = pymongo.Connection(**settings.MONGO_CONNECTION)
    db = mongo[settings.MONGO_DB][db_name]
    db.ensure_index(index, unique=True)

    def getter(self):
        doc = db.find_one({index: getattr(self, index)})
	if doc is None: # not found, init                                                                                         
            setattr(self, field, {})
            return {}
	return doc[field]

    def setter(self, doc):
	db.update({index: getattr(self, index)},
                  {index: self.email, field: doc},
			True) # upsert profile data                                                                               

    return property(getter, setter)