Question

With old datastore I’ve used keys. Now I have to use ids (taken from NDB Cheat Sheet doc):

user = User.get_by_id(user_id)
if user is None:
    user = User(id=user_id)

But looks like this code doesn’t work – the record is added several times.

(user_id is String in my case)

Answer 1

I found the reason, my code above is correct, but my class contained id property:

class User(ndb.Model):
    id = ndb.StringProperty() 

and it was the problem.