Currently if I have an object such as

class Foo(DynamicDocument): _id = ObjectIdField(required=True, default=ObjectId, primary_key=True) bar = DictField()

When I create a new item and add it I get:

{ _id: ObjectId(<objectid>), bar: {} }

I would rather this be

{ _id: ObjectId(<objectid>) }

Is there a way to do this currently? List has similar behavior by creating a [].