Creating a model that references itself with Google App Engine

Question

I tried doing the following

class SomeModel(db.Model):
    prev = db.ReferenceProperty(SomeModel)
    next = db.ReferenceProperty(SomeModel)

but got the following error

NameError: name 'TrackPointModel' is not defined

Is there a way of doing this?

Answer 1

Yes, you can use a SelfReferenceProperty

class SomeModel(db.Model):
    prev = db.SelfReferenceProperty()
    next = db.SelfReferenceProperty()