def _to_pb(self):
    raise NotImplementedError(
        'This filter only supports in memory operations (%r)' % self)
{% can_be_positioned [object] as [varname] %}
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/datastore/datastore_query.py/FilterPredicate._to_pb--crossover with--dataset/ETHPy150Open callowayproject/django-kamasutra/positions/tests.py/PositionsTestCase.testTTCanBePositioned