gistfile1.txt

>>> from mongoengine import *
>>> class FacebookUser(Document):
...     meta = { "allow_inheritance": False }
...     facebook_id = StringField(primary_key = True, max_length = 20)
... 
>>> connect("test")
Connection('localhost', 27017)
>>> FacebookUser.objects.delete()
>>> FacebookUser.objects
[]
>>> FacebookUser.objects.get_or_create(facebook_id = "1234")
(<FacebookUser: FacebookUser object>, True)
>>> FacebookUser.objects
[]