Question

Let’s say I have entities a, b and c all of the same type, and the situation is like this:

entity a is parent for entity b
entity b is parent for entity c

Now if I do the following query

query = ndb.Query(ancestor=a.key)
result = query.fetch()

The result will contain both b and c entities. Is there a way I can filter out c so that only entities that are direct descendants remain? Any way apart from me going through the results and removing them I mean.

Answer 1

The only way to do this is to modify your schema, adding a ‘parent’ KeyProperty that references an entity’s direct parent, then filtering on that.