在测试中使用 factory_boy _fixture_teardown 期间不存在相关对象

问题描述

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

解决方法

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