Hi,

Using google-cloud-ndb==0.2.0

I have the following classes:

class Base(PolyModel):
    status = StringProperty()
    ...

class Child(Base):
   filter_prop = StringProperty()
   projected_prop = StringProperty()

The following query throws an exception (a work around I tried for the second issue):

list(Base.query().fetch(projection=["class"]))

The Exception:

File "<env>/site-packages/google/cloud/ndb/model.py", line 4721, in _lookup_model
    ).format(kind)
google.cloud.ndb.model.KindError: No model class found for the kind 'd'. Did you forget to import it?

Would love to hear of any solution I could use for the meantime (other than removing projection...)
Thanks!