Datastore Python Client Libraries: Query ndb.Polymodel

Jun 4, 2019

Assuming you was using App Engine Python 2.7 with ndb.PolyModel.

from google.appengine.ext import ndbfrom google.appengine.ext.ndb import polymodelclass Item(polymodel.PolyModel):  name = ndb.StringProperty()  is_active = ndb.BooleanProperty()class Country(Item):  population = ndb.IntegerProperty()

Query using Datastore Python Client Libraries.

from import datastorelog = logging.getLogger(__name__)def init_datastore():    return datastore.Client()    # return datastore.Client.from_service_account_json('keys/PROJECT_ID-datastore.json')db = init_datastore()query = db.query(kind='Item')query.add_filter('class', '=', 'Country')query.add_filter('is_active', '=', True)items = query.fetch()for _item in items:"name={_item['name']}")

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