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[英]django.db.utils.IntegrityError: FOREIGN KEY constraint failed in django
[英]django.db.utils.IntegrityError: FOREIGN KEY constraint failed while executing LiveServerTestCases through Selenium and Python Django
我可以成功运行所有单元测试,如果我运行独立服务器,我什至可以成功运行 selenium 测试,但是当我尝试使用 LiveServerTestCases 以自包含的方式测试所有内容时,每个 LiveServerTestCase 测试在完成后都以以下错误结束拆卸功能:
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\backends\base\base.py", line 239, in _commit
return self.connection.commit()
django.db.utils.IntegrityError: FOREIGN KEY constraint failed
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\test\testcases.py", line 209, in __call__
self._post_teardown()
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\test\testcases.py", line 908, in _post_teardown
self._fixture_teardown()
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\test\testcases.py", line 943, in _fixture_teardown
inhibit_post_migrate=inhibit_post_migrate)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\core\management\__init__.py", line 148, in call_command
return command.execute(*args, **defaults)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\core\management\base.py", line 353, in execute
output = self.handle(*args, **options)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\core\management\commands\flush.py", line 80, in handle
emit_post_migrate_signal(verbosity, interactive, database)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\core\management\sql.py", line 51, in emit_post_migrate_signal
**kwargs
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\dispatch\dispatcher.py", line 175, in send
for receiver in self._live_receivers(sender)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\dispatch\dispatcher.py", line 175, in <listcomp>
for receiver in self._live_receivers(sender)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\contrib\auth\management\__init__.py", line 79, in create_permissions
Permission.objects.using(using).bulk_create(perms)
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\models\query.py", line 471, in bulk_create
obj_without_pk._state.db = self.db
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\transaction.py", line 212, in __exit__
connection.commit()
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\backends\base\base.py", line 261, in commit
self._commit()
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\backends\base\base.py", line 239, in _commit
return self.connection.commit()
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\backends\base\base.py", line 239, in _commit
return self.connection.commit()
django.db.utils.IntegrityError: FOREIGN KEY constraint failed
我很确定我的数据库模型中没有任何错误,因为当我启动一个单独的服务器实例以并行运行时,所有单元测试运行良好并且 selenium 测试运行良好,所以我猜它有与硒有关吗?
我尝试过使用 Chrome webdriver、IE webdriver 和 Firefox webdriver。 结果一样。 它似乎与我的数据库无关,因为该错误仅发生在 LiveServerTestCases 上。
有关Django版本、数据库类型和版本以及您的代码试验的更多信息将帮助我们以更好的方式调试此问题。
但是,此错误消息...
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\core\management\sql.py", line 51, in emit_post_migrate_signal **kwargs
.
File "C:\Users\Win7\.virtualenvs\lang-QbOXb8q_\lib\site-packages\django\db\backends\base\base.py", line 239, in _commit
return self.connection.commit()
django.db.utils.IntegrityError: FOREIGN KEY constraint failed
...暗示在尝试保存现有模型实例时引发了IntegrityError 。
现在使用DEFERRABLE INITIALLY DEFERRED而不是DEFERRABLE IMMEDIATE创建外键。 因此,可能需要重新构建表以使用新定义重新创建外键,尤其是在您使用如下模式时;
from django.db import transaction with transaction.atomic(): Book.objects.create(author_id=1) Author.objects.create(id=1)
如果您不将外键重新创建为DEFERRED ,则第一个create()
将失败,因为强制执行外键约束。
@dirkgroten 在这个讨论中提供了一个例子,如下所示:
在您的代码中寻找这样的模式:
# in pagetree/models.py, line 810 @classmethod def create_from_dict(cls, d): return cls.objects.create() # what happens to d by the way?
这肯定会因ForeignKey constraint
错误而失败,因为 PageBlock 必须有部分,所以你不能在没有先分配它的情况下调用 create 。
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