按索引問題的Django Queryset訪問

Question

我有一個created_at字段的客戶端模型。我想從shell更新客戶端的created_at。我做了以下內容：

>>> c = Client.objects.all() 
>>> c[1].created_at 
>>> # I get nothing here since it's not set yet 
>>> from django.utils import timezone 
>>> c[1].created_at = timezone.now() 
>>> c[1].save() 
>>> c[1].created_at 
>>> # I still get nothing here. Even when I reload the queryset, I get nothing. 

然而，當我做同樣的事情與c = Client.object.get(id=1)，它的工作原理。爲什麼會發生？

Answer 1

您需要的查詢集對象分配給自己的istance，然後它會保存，什麼你做以上只是編輯查詢集項目

c = Client.objects.all() 
obj = c[1] 
obj.created_at = timezone.now() 
obj.save()