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# Copyright DataStax, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import uuid
from unittest import mock
from cassandra.cqlengine import columns
from cassandra.cqlengine import models
from cassandra.cqlengine.connection import get_session
from tests.integration.cqlengine.base import BaseCassEngTestCase
from cassandra.cqlengine import management
class TestInheritanceClassConstruction(BaseCassEngTestCase):
def test_multiple_discriminator_value_failure(self):
""" Tests that defining a model with more than one discriminator column fails """
with self.assertRaises(models.ModelDefinitionException):
class M(models.Model):
partition = columns.Integer(primary_key=True)
type1 = columns.Integer(discriminator_column=True)
type2 = columns.Integer(discriminator_column=True)
def test_no_discriminator_column_failure(self):
with self.assertRaises(models.ModelDefinitionException):
class M(models.Model):
__discriminator_value__ = 1
def test_discriminator_value_inheritance(self):
""" Tests that discriminator_column attribute is not inherited """
class Base(models.Model):
partition = columns.Integer(primary_key=True)
type1 = columns.Integer(discriminator_column=True)
class M1(Base):
__discriminator_value__ = 1
class M2(M1):
pass
assert M2.__discriminator_value__ is None
def test_inheritance_metaclass(self):
""" Tests that the model meta class configures inherited models properly """
class Base(models.Model):
partition = columns.Integer(primary_key=True)
type1 = columns.Integer(discriminator_column=True)
class M1(Base):
__discriminator_value__ = 1
assert Base._is_polymorphic
assert M1._is_polymorphic
assert Base._is_polymorphic_base
assert not M1._is_polymorphic_base
assert Base._discriminator_column is Base._columns['type1']
assert M1._discriminator_column is M1._columns['type1']
assert Base._discriminator_column_name == 'type1'
assert M1._discriminator_column_name == 'type1'
def test_table_names_are_inherited_from_base(self):
class Base(models.Model):
partition = columns.Integer(primary_key=True)
type1 = columns.Integer(discriminator_column=True)
class M1(Base):
__discriminator_value__ = 1
assert Base.column_family_name() == M1.column_family_name()
def test_collection_columns_cant_be_discriminator_column(self):
with self.assertRaises(models.ModelDefinitionException):
class Base(models.Model):
partition = columns.Integer(primary_key=True)
type1 = columns.Set(columns.Integer, discriminator_column=True)
class InheritBase(models.Model):
partition = columns.UUID(primary_key=True, default=uuid.uuid4)
row_type = columns.Integer(discriminator_column=True)
class Inherit1(InheritBase):
__discriminator_value__ = 1
data1 = columns.Text()
class Inherit2(InheritBase):
__discriminator_value__ = 2
data2 = columns.Text()
class TestInheritanceModel(BaseCassEngTestCase):
@classmethod
def setUpClass(cls):
super(TestInheritanceModel, cls).setUpClass()
management.sync_table(Inherit1)
management.sync_table(Inherit2)
@classmethod
def tearDownClass(cls):
super(TestInheritanceModel, cls).tearDownClass()
management.drop_table(Inherit1)
management.drop_table(Inherit2)
def test_saving_base_model_fails(self):
with self.assertRaises(models.PolymorphicModelException):
InheritBase.create()
def test_saving_subclass_saves_disc_value(self):
p1 = Inherit1.create(data1='pickle')
p2 = Inherit2.create(data2='bacon')
assert p1.row_type == Inherit1.__discriminator_value__
assert p2.row_type == Inherit2.__discriminator_value__
def test_query_deserialization(self):
p1 = Inherit1.create(data1='pickle')
p2 = Inherit2.create(data2='bacon')
p1r = InheritBase.get(partition=p1.partition)
p2r = InheritBase.get(partition=p2.partition)
assert isinstance(p1r, Inherit1)
assert isinstance(p2r, Inherit2)
def test_delete_on_subclass_does_not_include_disc_value(self):
p1 = Inherit1.create()
session = get_session()
with mock.patch.object(session, 'execute') as m:
Inherit1.objects(partition=p1.partition).delete()
# make sure our discriminator value isn't in the CQL
# not sure how we would even get here if it was in there
# since the CQL would fail.
self.assertNotIn("row_type", m.call_args[0][0].query_string)
class UnindexedInheritBase(models.Model):
partition = columns.UUID(primary_key=True, default=uuid.uuid4)
cluster = columns.UUID(primary_key=True, default=uuid.uuid4)
row_type = columns.Integer(discriminator_column=True)
class UnindexedInherit1(UnindexedInheritBase):
__discriminator_value__ = 1
data1 = columns.Text()
class UnindexedInherit2(UnindexedInheritBase):
__discriminator_value__ = 2
data2 = columns.Text()
class UnindexedInherit3(UnindexedInherit2):
__discriminator_value__ = 3
data3 = columns.Text()
class TestUnindexedInheritanceQuery(BaseCassEngTestCase):
@classmethod
def setUpClass(cls):
super(TestUnindexedInheritanceQuery, cls).setUpClass()
management.sync_table(UnindexedInherit1)
management.sync_table(UnindexedInherit2)
management.sync_table(UnindexedInherit3)
cls.p1 = UnindexedInherit1.create(data1='pickle')
cls.p2 = UnindexedInherit2.create(partition=cls.p1.partition, data2='bacon')
cls.p3 = UnindexedInherit3.create(partition=cls.p1.partition, data3='turkey')
@classmethod
def tearDownClass(cls):
super(TestUnindexedInheritanceQuery, cls).tearDownClass()
management.drop_table(UnindexedInherit1)
management.drop_table(UnindexedInherit2)
management.drop_table(UnindexedInherit3)
def test_non_conflicting_type_results_work(self):
p1, p2, p3 = self.p1, self.p2, self.p3
assert len(list(UnindexedInherit1.objects(partition=p1.partition, cluster=p1.cluster))) == 1
assert len(list(UnindexedInherit2.objects(partition=p1.partition, cluster=p2.cluster))) == 1
assert len(list(UnindexedInherit3.objects(partition=p1.partition, cluster=p3.cluster))) == 1
def test_subclassed_model_results_work_properly(self):
p1, p2, p3 = self.p1, self.p2, self.p3
assert len(list(UnindexedInherit2.objects(partition=p1.partition, cluster__in=[p2.cluster, p3.cluster]))) == 2
def test_conflicting_type_results(self):
with self.assertRaises(models.PolymorphicModelException):
list(UnindexedInherit1.objects(partition=self.p1.partition))
with self.assertRaises(models.PolymorphicModelException):
list(UnindexedInherit2.objects(partition=self.p1.partition))
class IndexedInheritBase(models.Model):
partition = columns.UUID(primary_key=True, default=uuid.uuid4)
cluster = columns.UUID(primary_key=True, default=uuid.uuid4)
row_type = columns.Integer(discriminator_column=True, index=True)
class IndexedInherit1(IndexedInheritBase):
__discriminator_value__ = 1
data1 = columns.Text()
class IndexedInherit2(IndexedInheritBase):
__discriminator_value__ = 2
data2 = columns.Text()
class TestIndexedInheritanceQuery(BaseCassEngTestCase):
@classmethod
def setUpClass(cls):
super(TestIndexedInheritanceQuery, cls).setUpClass()
management.sync_table(IndexedInherit1)
management.sync_table(IndexedInherit2)
cls.p1 = IndexedInherit1.create(data1='pickle')
cls.p2 = IndexedInherit2.create(partition=cls.p1.partition, data2='bacon')
@classmethod
def tearDownClass(cls):
super(TestIndexedInheritanceQuery, cls).tearDownClass()
management.drop_table(IndexedInherit1)
management.drop_table(IndexedInherit2)
def test_success_case(self):
self.assertEqual(len(list(IndexedInherit1.objects(partition=self.p1.partition))), 1)
self.assertEqual(len(list(IndexedInherit2.objects(partition=self.p1.partition))), 1)
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