Is it possible to filter against a named reference collection?  The
datastore doesn't complain, but I never get any results...

class Foo(search.SearchableModel):
  prop1 = TextProperty()

class Fee(db.Model):
  prop2 = db.IntegerProperty()
  prop3 = db.ReferenceProperty(Foo, collection_name='my_items')

my_fee = Fee.all().filter('prop2 =', 11).get()
foos = Foo.all().filter('my_items =', my_fee.key())

I have tried every variation I can think of: using keys as above,
using my_fee directly without the key call, putting a str() around the
key, etc.).  I think I saw it work once or twice, but now I'm not sure
if that was just an illusion, and I can't replicate it.
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