querying list of nested objects

[Jacob G]

Using ndb, I can query for entities from a list of nested objects like this:

from djangae.test import TestCase
from google.appengine.ext import ndb


class Label(ndb.Model):
    id = ndb.StringProperty()
    name = ndb.StringProperty()


class ModelWithLabels(ndb.Model):
    labels = ndb.StructuredProperty(Label, repeated=True)


class NdbComplexFieldsTestCase(TestCase):

    def test_query_from_list_of_objects(self):

        entity = ModelWithLabels(
            labels=[
                Label(
                    id='custom:123',
                    name='strong'
                ),
                Label(
                    id='custom:234',
                    name='fast'
                )
            ]
        )
        entity.put()

        query = ModelWithLabels.query(ModelWithLabels.labels.id == 'custom:123')

        self.assertEqual([i.key for i in query.fetch(1)], [entity.key])

But it doesn't seem like that might be possible with djangae, as shown in the following failing test:

@override_settings(GENERATE_SPECIAL_INDEXES_DURING_TESTING=True)
def test_can_query_from_list_of_values(self):

    e = JsonFieldModel.objects.create(labels=[
        {
            'id': 'department:123',
            'name': 'Office'
        }
    ])

    query = JsonFieldModel.objects.filter(labels__id='department:123')

    self.assertEqual(list(i.id for i in query), [e.id])

The documentation seems to say that:

https://djangae.readthedocs.io/en/latest/fields/#jsonfield

Are there are any workarounds? I think there may be clever ways to accomplish the same idea, but perhaps it won't be schema-compatible with a side-by-side ndb implementation.