What's the equivalent of Entity.all(keys_only=True).fetch(20) in NDB?

问题

How do I get the equivalent result of the following query in NDB?

Entity.all(keys_only=True).fetch(20)

I know you can pass 'keys_only=True' to the iter() method. But what if I want to perform a keys only fetch, how do I do that in NDB?

回答1:

Found it in the GAE NDB Docs. The answer is Entity.query().fetch(20,keys_only=True).

来源：https://stackoverflow.com/questions/10203874/whats-the-equivalent-of-entity-allkeys-only-true-fetch20-in-ndb