Python Django can'；在测试期间刷新数据库

尝试运行测试（python manage.py test）时，我得到：

CommandError: Database test_db couldn't be flushed. Possible reasons:
  * The database isn't running or isn't configured correctly.
  * At least one of the expected database tables doesn't exist.
  * The SQL was invalid.
Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL this command wasn't able to run.
The full error: cannot truncate a table referenced in a foreign key constraint
DETAIL:  Table "install_location_2015_05_13" references "app".
HINT:  Truncate table "install_location_2015_05_13" at the same time, or use TRUNCATE ... CASCADE.

我在我们的项目中使用的是通过python函数动态生成的（因此我可以定期运行它）。我没有这些分区的任何模型

分区维护功能在syncdb触发post_syncdb信号后调用（因此在设置测试数据库时执行）

如何让Django清除附加表（分区）？或

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我如何告诉Django在运行测试时使用CASCADE？

主要问题发生在我们在M2M字段中更改关系的地方。保留旧约束，并为新关系创建新约束

对于Django==2.0.2me，我仍然会遇到这种情况，对于Django==3.1.2，我也会遇到这种情况