NDB: filtering by properties on multiple entities

[Rad Apdal via StackOverflow]

You can denormalize your data and form a Structured property, then run multiple filters on it.

From their samples:

class Address(ndb.Model):
    type = ndb.StringProperty()  # E.g., 'home', 'work'
    street = ndb.StringProperty()
    city = ndb.StringProperty()

class Contact(ndb.Model):
    name = ndb.StringProperty()
    addresses = ndb.StructuredProperty(Address, repeated=True)

def query_contact_multiple_values_in_single_sub_entity():
    query = Contact.query(Contact.addresses == Address(city='San Francisco',
                                                       street='Spear St'))
    return query

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