Question

我开始使用factory_boy包，因此我建立了一些工厂，并希望测试创建的对象不会引发任何验证错误。

这是我正在使用的mixin，它基本上从模块中获取每个工厂，创建一个实例，然后测试.full_clean()中是否没有错误。已加载的用户夹具是10个实例，其ID为1到10。

class FactoriesTestCaseMixin:
    fixtures = [
        'user/tests/fixtures/user.json',
    ]
    module = None

    def test_factories(self):
        err_msg = '{name} caused errors:\n{errors}'
        factories = [
            (name, obj) for name, obj in inspect.getmembers(self.module, inspect.isclass)
            if obj.__module__ == self.module.__name__
            and not obj._meta.abstract
        ]
        for factory in factories:
            name = factory[0]
            instance = factory[1]()

            errors = None
            try:
                instance.full_clean()
            except ValidationError as e:
                errors = e

            self.assertTrue(errors is None, err_msg.format(name=name, errors=errors))

mixin会这样使用

from django.test import TestCase
from order import factories

class OrderFactoriesTestCase(FactoriesTestCaseMixin, TestCase):
    module = factories

但是在测试成功通过后，我仍然遇到IntegrityError（下面的回溯），涉及夹具拆卸问题，我不知道如何解决它，因此我的测试没有错误通过。

如果我为每个单独的应用程序运行测试，则没有错误。我的其他模型的灯具也都存在created_by字段，我从来没有遇到问题。

django.db.utils.IntegrityError: insert or update on table "product_product" violates foreign key constraint "product_product_created_by_id_96713f93_fk_user_user_id"
DETAIL:  Key (created_by_id)=(13) is not present in table "user_user".

我认为正在发生的事情是，先前的测试正在创建一个新用户，而工厂男孩Iterator正在选择一个新用户ID。.仍然不确定为什么成功通过测试后会导致错误测试。

created_by = factory.Iterator(User.objects.all())

导致此问题的模块始终对ProductFactory具有SubFactory

product = factory.SubFactory(ProductFactory)

关于如何解决此问题的任何建议？

Traceback (most recent call last):
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/test/testcases.py", line 274, in __call__
    self._post_teardown()
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/test/testcases.py", line 1009, in _post_teardown
    self._fixture_teardown()
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/test/testcases.py", line 1177, in _fixture_teardown
    connections[db_name].check_constraints()
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/db/backends/postgresql/base.py", line 246, in check_constraints
    self.cursor().execute('SET CONSTRAINTS ALL IMMEDIATE')
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 67, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 76, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/Development/project/venv/lib/python3.7/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/Development/project/venv/lib/python3.7/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 "product_product" violates foreign key constraint "product_product_created_by_id_96713f93_fk_user_user_id"
DETAIL:  Key (created_by_id)=(12) is not present in table "user_user".

Answer 1

我有一个相关的问题，我通过在我的测试用例类中专门化 _fixture_teardown 解决了这个问题。

_fixture_teardown 在 django.test.testcases 中实现以调用 django 命令“flush”，该命令试图从数据库中删除所有数据。我不知道这对你是否有用。在我保留测试数据库并使用 --keepdb 的场景中，它导致了问题。

因为我不需要（或不想）刷新测试数据库，所以我只是将方法专门化为什么都不做。这解决了我的问题，也可能有助于解决您的问题。

Django在夹具拆卸中测试IntegrityError

1 个答案: