Django在测试期间无法刷新数据库

Question

当尝试运行测试（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分区是通过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。

在syncdb触发post_syncdb信号后调用分区维护功能（因此在建立测试数据库时执行该信号）。

如何使Django清除其他表（分区）？或如何在运行测试时告诉Django使用CASCADE？

Answer 1

主要问题发生在我们改变 M2M 领域的关系时。旧的约束仍然存在，并为新关系创建了新的约束。已在 Django 1.8 中修复