115 lines
3.9 KiB
Python
115 lines
3.9 KiB
Python
# Copyright 2013-2016 DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from uuid import uuid4
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from cassandra.cqlengine import columns
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from cassandra.cqlengine.management import sync_table, drop_table
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from cassandra.cqlengine.models import Model, ModelDefinitionException
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from tests.integration.cqlengine.base import BaseCassEngTestCase
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class TestCounterModel(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.UUID(primary_key=True, default=uuid4)
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counter = columns.Counter()
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class TestClassConstruction(BaseCassEngTestCase):
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def test_defining_a_non_counter_column_fails(self):
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""" Tests that defining a non counter column field in a model with a counter column fails """
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try:
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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counter = columns.Counter()
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text = columns.Text()
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self.fail("did not raise expected ModelDefinitionException")
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except ModelDefinitionException:
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pass
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def test_defining_a_primary_key_counter_column_fails(self):
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""" Tests that defining primary keys on counter columns fails """
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try:
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.Counter(primary_ley=True)
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counter = columns.Counter()
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self.fail("did not raise expected TypeError")
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except TypeError:
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pass
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# force it
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try:
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class model(Model):
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partition = columns.UUID(primary_key=True, default=uuid4)
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cluster = columns.Counter()
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cluster.primary_key = True
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counter = columns.Counter()
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self.fail("did not raise expected ModelDefinitionException")
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except ModelDefinitionException:
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pass
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class TestCounterColumn(BaseCassEngTestCase):
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@classmethod
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def setUpClass(cls):
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drop_table(TestCounterModel)
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sync_table(TestCounterModel)
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@classmethod
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def tearDownClass(cls):
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drop_table(TestCounterModel)
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def test_updates(self):
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""" Tests that counter updates work as intended """
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instance = TestCounterModel.create()
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instance.counter += 5
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instance.save()
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actual = TestCounterModel.get(partition=instance.partition)
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assert actual.counter == 5
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def test_concurrent_updates(self):
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""" Tests updates from multiple queries reaches the correct value """
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instance = TestCounterModel.create()
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new1 = TestCounterModel.get(partition=instance.partition)
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new2 = TestCounterModel.get(partition=instance.partition)
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new1.counter += 5
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new1.save()
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new2.counter += 5
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new2.save()
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actual = TestCounterModel.get(partition=instance.partition)
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assert actual.counter == 10
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def test_update_from_none(self):
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""" Tests that updating from None uses a create statement """
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instance = TestCounterModel()
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instance.counter += 1
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instance.save()
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new = TestCounterModel.get(partition=instance.partition)
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assert new.counter == 1
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def test_new_instance_defaults_to_zero(self):
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""" Tests that instantiating a new model instance will set the counter column to zero """
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instance = TestCounterModel()
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assert instance.counter == 0
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