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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 unittest
from unittest import mock
from uuid import uuid4
from cassandra.cqlengine import columns
from cassandra.cqlengine.management import sync_table, drop_table
from cassandra.cqlengine.models import Model
from cassandra.cqlengine.query import BatchQuery, LWTException
from cassandra.cqlengine.statements import ConditionalClause
from tests.integration.cqlengine.base import BaseCassEngTestCase
from tests.integration import greaterthancass20
class TestConditionalModel(Model):
id = columns.UUID(primary_key=True, default=uuid4)
count = columns.Integer()
text = columns.Text(required=False)
class TestUpdateModel(Model):
partition = columns.Integer(primary_key=True)
cluster = columns.Integer(primary_key=True)
value = columns.Integer(required=False)
text = columns.Text(required=False, index=True)
@greaterthancass20
class TestConditional(BaseCassEngTestCase):
@classmethod
def setUpClass(cls):
super(TestConditional, cls).setUpClass()
sync_table(TestConditionalModel)
@classmethod
def tearDownClass(cls):
super(TestConditional, cls).tearDownClass()
drop_table(TestConditionalModel)
def test_update_using_conditional(self):
t = TestConditionalModel.if_not_exists().create(text='blah blah')
t.text = 'new blah'
with mock.patch.object(self.session, 'execute') as m:
t.iff(text='blah blah').save()
args = m.call_args
self.assertIn('IF "text" = %(0)s', args[0][0].query_string)
def test_update_conditional_success(self):
t = TestConditionalModel.if_not_exists().create(text='blah blah', count=5)
id = t.id
t.text = 'new blah'
t.iff(text='blah blah').save()
updated = TestConditionalModel.objects(id=id).first()
self.assertEqual(updated.count, 5)
self.assertEqual(updated.text, 'new blah')
def test_update_failure(self):
t = TestConditionalModel.if_not_exists().create(text='blah blah')
t.text = 'new blah'
t = t.iff(text='something wrong')
with self.assertRaises(LWTException) as assertion:
t.save()
self.assertEqual(assertion.exception.existing, {
'text': 'blah blah',
'[applied]': False,
})
def test_blind_update(self):
t = TestConditionalModel.if_not_exists().create(text='blah blah')
t.text = 'something else'
uid = t.id
with mock.patch.object(self.session, 'execute') as m:
TestConditionalModel.objects(id=uid).iff(text='blah blah').update(text='oh hey der')
args = m.call_args
self.assertIn('IF "text" = %(1)s', args[0][0].query_string)
def test_blind_update_fail(self):
t = TestConditionalModel.if_not_exists().create(text='blah blah')
t.text = 'something else'
uid = t.id
qs = TestConditionalModel.objects(id=uid).iff(text='Not dis!')
with self.assertRaises(LWTException) as assertion:
qs.update(text='this will never work')
self.assertEqual(assertion.exception.existing, {
'text': 'blah blah',
'[applied]': False,
})
def test_conditional_clause(self):
tc = ConditionalClause('some_value', 23)
tc.set_context_id(3)
self.assertEqual('"some_value" = %(3)s', str(tc))
self.assertEqual('"some_value" = %(3)s', str(tc))
def test_batch_update_conditional(self):
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
id = t.id
with BatchQuery() as b:
t.batch(b).iff(count=5).update(text='something else')
updated = TestConditionalModel.objects(id=id).first()
self.assertEqual(updated.text, 'something else')
b = BatchQuery()
updated.batch(b).iff(count=6).update(text='and another thing')
with self.assertRaises(LWTException) as assertion:
b.execute()
self.assertEqual(assertion.exception.existing, {
'id': id,
'count': 5,
'[applied]': False,
})
updated = TestConditionalModel.objects(id=id).first()
self.assertEqual(updated.text, 'something else')
@unittest.skip("Skipping until PYTHON-943 is resolved")
def test_batch_update_conditional_several_rows(self):
sync_table(TestUpdateModel)
self.addCleanup(drop_table, TestUpdateModel)
first_row = TestUpdateModel.create(partition=1, cluster=1, value=5, text="something")
second_row = TestUpdateModel.create(partition=1, cluster=2, value=5, text="something")
b = BatchQuery()
TestUpdateModel.batch(b).if_not_exists().create(partition=1, cluster=1, value=5, text='something else')
TestUpdateModel.batch(b).if_not_exists().create(partition=1, cluster=2, value=5, text='something else')
TestUpdateModel.batch(b).if_not_exists().create(partition=1, cluster=3, value=5, text='something else')
# The response will be more than two rows because two of the inserts will fail
with self.assertRaises(LWTException):
b.execute()
first_row.delete()
second_row.delete()
b.execute()
def test_delete_conditional(self):
# DML path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
t.iff(count=9999).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
t.iff(count=5).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 0)
# QuerySet path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
TestConditionalModel.objects(id=t.id).iff(count=9999).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
TestConditionalModel.objects(id=t.id).iff(count=5).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 0)
def test_delete_lwt_ne(self):
"""
Test to ensure that deletes using IF and not equals are honored correctly
@since 3.2
@jira_ticket PYTHON-328
@expected_result Delete conditional with NE should be honored
@test_category object_mapper
"""
# DML path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
t.iff(count__ne=5).delete()
t.iff(count__ne=2).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 0)
# QuerySet path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
TestConditionalModel.objects(id=t.id).iff(count__ne=5).delete()
TestConditionalModel.objects(id=t.id).iff(count__ne=2).delete()
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 0)
def test_update_lwt_ne(self):
"""
Test to ensure that update using IF and not equals are honored correctly
@since 3.2
@jira_ticket PYTHON-328
@expected_result update conditional with NE should be honored
@test_category object_mapper
"""
# DML path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
t.iff(count__ne=5).update(text='nothing')
t.iff(count__ne=2).update(text='nothing')
self.assertEqual(TestConditionalModel.objects(id=t.id).first().text, 'nothing')
t.delete()
# QuerySet path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
TestConditionalModel.objects(id=t.id).iff(count__ne=5).update(text='nothing')
TestConditionalModel.objects(id=t.id).iff(count__ne=2).update(text='nothing')
self.assertEqual(TestConditionalModel.objects(id=t.id).first().text, 'nothing')
t.delete()
def test_update_to_none(self):
# This test is done because updates to none are split into deletes
# for old versions of cassandra. Can be removed when we drop that code
# https://github.com/datastax/python-driver/blob/3.1.1/cassandra/cqlengine/query.py#L1197-L1200
# DML path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
t.iff(count=9999).update(text=None)
self.assertIsNotNone(TestConditionalModel.objects(id=t.id).first().text)
t.iff(count=5).update(text=None)
self.assertIsNone(TestConditionalModel.objects(id=t.id).first().text)
# QuerySet path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
self.assertEqual(TestConditionalModel.objects(id=t.id).count(), 1)
with self.assertRaises(LWTException):
TestConditionalModel.objects(id=t.id).iff(count=9999).update(text=None)
self.assertIsNotNone(TestConditionalModel.objects(id=t.id).first().text)
TestConditionalModel.objects(id=t.id).iff(count=5).update(text=None)
self.assertIsNone(TestConditionalModel.objects(id=t.id).first().text)
def test_column_delete_after_update(self):
# DML path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
t.iff(count=5).update(text=None, count=6)
self.assertIsNone(t.text)
self.assertEqual(t.count, 6)
# QuerySet path
t = TestConditionalModel.if_not_exists().create(text='something', count=5)
TestConditionalModel.objects(id=t.id).iff(count=5).update(text=None, count=6)
self.assertIsNone(TestConditionalModel.objects(id=t.id).first().text)
self.assertEqual(TestConditionalModel.objects(id=t.id).first().count, 6)
def test_conditional_without_instance(self):
"""
Test to ensure that the iff method is honored if it's called
directly from the Model class
@jira_ticket PYTHON-505
@expected_result the value is updated
@test_category object_mapper
"""
uuid = uuid4()
TestConditionalModel.if_not_exists().create(id=uuid, text='test_for_cassandra', count=5)
# This uses the iff method directly from the model class without
# an instance having been created
TestConditionalModel.iff(count=5).filter(id=uuid).update(text=None, count=6)
t = TestConditionalModel.filter(id=uuid).first()
self.assertIsNone(t.text)
self.assertEqual(t.count, 6)
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