These APIs are available for MongoDB only, so using any of these features breaks portability to other non-relational databases (Google App Engine, Cassandra, Redis, ...). For the sake of portability you should try to avoid database-specific features whenever possible.

Lower-Level API

from django_mongodb_engine.contrib import MongoDBManager

class FooModel(models.Model):
    objects = MongoDBManager()
>>> FooModel.objects.raw_query(...)
>>> FooModel.objects.raw_update(...)