TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while using signals, but only during Unit Testing

Question

I am getting TransactionManagementError when trying to save a Django User model instance and in its post_save signal, I\'m saving some models that have the user as the forei

Answer 1

def test_wrong_user_country_db_constraint(self):
        """
        Check whether or not DB constraint doesnt allow to save wrong country code in DB.
        """
        self.test_user_data['user_country'] = 'XX'
        expected_constraint_name = "country_code_within_list_of_countries_check"

        with transaction.atomic():
            with self.assertRaisesRegex(IntegrityError, expected_constraint_name) as cm:
                get_user_model().objects.create_user(**self.test_user_data)

        self.assertFalse(
            get_user_model().objects.filter(email=self.test_user_data['email']).exists()
        )

with transaction.atomic() seems do the job correct