How to use mongokit dbrefs with django_mongokit

Hi,

With pymongo I can specify:
db.add_son_manipulator(NamespaceInjector())
db.add_son_manipulator(AutoReference(db))

and then set dbref as:
db.collection({'attr': db.collection_alt.find_one({params}), ...}).save()

How do I achieve the same with django_mongokit
