post_syncdb上不存在ContentType匹配查询 [英] ContentType matching query does not exist on post_syncdb

问题描述

我正在尝试添加一些数据到数据库，一旦创建表，使用 post_syncdb 信号。

I am trying to add add some data to the database as soon as tables are created, using the post_syncdb signal.

signals.post_syncdb.connect(init)

然后在init函数中，我想设置权限，所以我使用

Then in the init function, I want to set permission, so I use

ct = ContentType.objects.get(app_label='news', model='Article')
Permission(name='Approve articles', codename='can_approve_article', content_type=ct)

但是如果我删除所有表并运行 syncdb ，我得到

But if I drop all the tables and run syncdb, I get

...
File "...\base\functions\init.py", line 11, in init
  ct = ContentType.objects.get(app_label='news', model='Article')
...
django.contrib.contenttypes.models.DoesNotExist: ContentType matching query does not exist.

我做了一些测试：

• 如果我在 syncdb 之外尝试此代码，则可以正常工作。


• 如果我让 syncdb 创建没有此代码的所有表，然后添加此代码并运行syncdb，而不必进行任何更改。


• 我很确定它曾经工作，但从那以后，我改变了很多其他地方的东西，所以我不知道从哪里开始。


• 我得到与其他模型相同的错误在不同的应用程序中。


• 信号被触发约10次，只有前几次抛出错误。

• It works fine if I try this code outside syncdb.
• It also works fine if I let syncdb create all the tables without this code, and then add this code and run syncdb without it having to make any changes.
• AND I am pretty sure it used to work, but I changed a lot of things in other places since then, so I don't know where to start.
• I get the same error for other models in different apps.
• The signal is fired about 10 times, only the first few times throw the error.

非常感谢任何提示！

推荐答案

将其添加到init函数的开头：

Add this to the beginning of your init function:

 from django.contrib.contenttypes.management import update_all_contenttypes
 update_all_contenttypes() # make sure all content types exist

这篇关于post_syncdb上不存在ContentType匹配查询的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！