Querying for entities with missing properties in app engine Datastore?

Question

I have a model which looks like this:

class Example (db.Model) :
 row_num = db.IntegerProperty(required=True)
 updated = db.IntegerProperty()
 ...
 ...


        

Answer 1

In GQL, objects which do not have a value for a property cannot be returned by queries on that property, so what you're asking for is impossible without a default value.

Reference: section headed "Entities Without a Filtered Property Are Never Returned by a Query" on this page.