Django的DateTimeField字段定義爲空白=真，空=真，但不允許空

Question

我有一個DateTimeField字段在我的Django的車型之一。

completed_date = models.DateTimeField('date completed', blank=True, null=True) 

我已經定義它允許空白和空值。然而，當我嘗試創建模型的實例，我得到以下錯誤：

IntegrityError at /admin/tasks/project/add/

tasks_project.completed_date may not be NULL

我使用Django 1.25和Python 2.7。任何人都知道這是爲什麼發生？有什麼我可以解決這個問題嗎？

我發現了一個ticket that describes the same problem，但它關閉在4年前固定的，所以我想它一定是現在集成到Django的！

Answer 1

django syncdb and an updated model

從提問/回答：

Django doesn't support migrations out of the box. There is a pluggable app for Django that does exactly that though, and it works great. It's called South.

http://south.aeracode.org/

Havent used django in a while, but i seem to remember that syncdb does perform alter commands on db tables. you have to drop the table then run again and it will create again.