如何解决在测试中使用 factory_boy _fixture_teardown 期间不存在相关对象
我已经设置了一个 django 测试套件,使用 factory_boy
来处理模型。
在通过 ForeignKey
涉及相关对象的测试中,我看到错误提示相关对象在 _fixture_teardown
期间不存在。我不明白为什么,因为这是拆解的一部分。
错误是;
Traceback (most recent call last):
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/test/testcases.py",line 284,in _setup_and_call
self._post_teardown()
File "/Users/mwalker/Sites/consoles/project/tests/mixins.py",line 10,in _post_teardown
super()._post_teardown()
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/test/testcases.py",line 1006,in _post_teardown
self._fixture_teardown()
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/test/testcases.py",line 1248,in _fixture_teardown
connections[db_name].check_constraints()
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/backends/postgresql/base.py",line 285,in check_constraints
cursor.execute('SET CONSTRAINTS ALL IMMEDIATE')
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/backends/utils.py",line 66,in execute
return self._execute_with_wrappers(sql,params,many=False,executor=self._execute)
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/backends/utils.py",line 75,in _execute_with_wrappers
return executor(sql,many,context)
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/backends/utils.py",line 84,in _execute
return self.cursor.execute(sql,params)
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/utils.py",line 90,in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/Users/mwalker/Sites/consoles/.venv/lib/python3.8/site-packages/django/db/backends/utils.py",line 82,in _execute
return self.cursor.execute(sql)
django.db.utils.IntegrityError: insert or update on table "charity_listing" violates foreign key constraint "charity_listing_client_id_c3b74de6_fk_clients_client_id"
DETAIL: Key (client_id)=(1) is not present in table "clients_client".
到目前为止,我只从 Client
表中看到此错误,但我的测试范围仍然非常有限。
上述错误的失败测试是;
class ApplicationTest(TestCase):
@classmethod
def setUpTestData(cls):
client = ClientFactory.create(name='Stackoverflow',enabled=True)
listing = ListingFactory.create(client=client,enabled=True)
occurrence = OccurrenceFactory.create(enabled=True)
user = UserFactory.create()
cls.application = ApplicationFactory.create(
listing=listing,occurrence=occurrence,pledge_amount=123,user=user
)
def test_application_creation(self):
self.assertTrue(isinstance(self.application,Application))
self.assertEqual(
self.application.__str__(),f'{self.application.user.name} - {self.application.listing}'
)
本次测试的关键工厂是;
class ClientFactoryBase(factory.django.DjangoModelFactory):
enabled = factory.Faker(provider='random_element',elements=(True,False))
name = factory.Faker(provider='pystr',max_chars=255)
class Meta:
model = Client
class ListingFactoryBase(factory.django.DjangoModelFactory):
enabled = factory.Faker(provider='random_element',False))
client = factory.SubFactory(factory='model_factories.clients.ClientFactory')
tier = factory.Faker(provider='random_element',elements=TIER_CHOICES)
@factory.post_generation
def occurrences(self,create,extracted,**kwargs):
if not create:
# Simple build,do nothing.
return
if extracted:
# A list of occurrences were passed in,use them
for item in extracted:
self.occurrences.add(item)
class Meta:
model = Listing
class ApplicationFactoryBase(factory.django.DjangoModelFactory):
user = factory.SubFactory(factory='model_factories.authentication.UserFactory')
listing = factory.SubFactory(factory='model_factories.charity.ListingFactory')
occurrence = factory.SubFactory(factory='model_factories.event.OccurrenceFactory')
pledge_amount = factory.Faker(provider='random_int',min=-2147483648,max=2147483647)
status = factory.Faker(provider='random_element',elements=STATUS_CHOICES)
class Meta:
model = Application
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