Foreign Key Constraint fails from unit tests

I have some unit tests that create and modify models in the test database, and I get FK constraint failures when the test saves a new model instance:

IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails (`test_apptest`.`apptest_historicalprofile`, CONSTRAINT `apptest_history_user_id_34e23bc9_fk_auth_user_id` FOREIGN KEY (`history_user_id`) REFERENCES `auth_use)')

I’m using the middleware-based solution to collect the current user, which I guess is part of the reason for this issue (no request is made in the test, so no user to capture), but it looks like the historical* object allows a Null for the user_id, so what is happening here? And what is the workaround?

(Django 1.9.5, django-simple-history 1.8.0)

[gabn88]

Please close the issue 👍

[rossmechanic]

@kingkoma, my guess is that you’re using django-webtest. Look here: https://django-simple-history.readthedocs.io/en/latest/reference.html#using-django-webtest-with-middleware