[django的]錯誤：CONTENTTYPES不能復位

Question

我重置之前加載夾具（參照Problems with contenttypes when loading a fixture in Django）CONTENTTYPES。

但CONTENTTYPES不能復位：

...project_dir > manage.py reset contenttypes

You have requested a database reset. This will IRREVERSIBLY DESTROY any data for the "contenttypes" application in the database "my_database". Are you sure you want to do this?

Type 'yes' to continue, or 'no' to cancel: yes

Error: Error: contenttypes couldn't be reset. Possible reasons:

• The database isn't running or isn't configured correctly.
• At least one of the database tables doesn't exist.
• The SQL was invalid.

Hint: Look at the output of 'django-admin.py sqlreset contenttypes'. That's the SQL this command wasn't able to run.

The full error: (1217, 'Cannot delete or update a parent row: a foreign key cons traint fails')

任何幫助將不勝感激。謝謝！

Answer 1

在這個問題你貼有另一answer - 使用natural keys的燈具。

的錯誤「不能刪除或更新父行：traint失敗外鍵利弊」的意思是，因爲是指向該行另一對象的內容類型行不能刪除。例如。如果有任何非空白的通用外鍵關係就是這種情況。

如果你真的需要重置內容類型的應用程序，你可以得到所需要這個SQL命令並改變其使用CASCADE聲明。但是，這是危險，因爲它不僅會刪除內容類型，還會刪除其他表中指向內容類型的行。

所以我建議重新創建使用自然鍵燈具。