Django：使用post_delete信号时如何确定删除用户

Question

我希望在某些对象被删除时，管理员能收到通知，但我也想知道是哪个用户在进行删除操作。

这样做可以吗？

这是代码：

# models.py
# signal to notify admins when nodes are deleted
from django.db.models.signals import post_delete
from settings import DEBUG

def notify_on_delete(sender, instance, using, **kwargs):
    ''' Notify admins when nodes are deleted. Only for production use '''
    if DEBUG:
        #return False
        pass
    # prepare context
    context = {
        'node': instance,
        'site': SITE
    }
    # notify admins that want to receive notifications
    notify_admins(instance, 'email_notifications/node-deleted-admin_subject.txt', 'email_notifications/node-deleted-admin_body.txt', context, skip=False)

post_delete.connect(notify_on_delete, sender=Node)

Answer 1

我怀疑使用内置的信号是行不通的，因为没有一个User和delete操作直接关联。而且由于Django的松耦合特性，数据库层也不会处理HttpRequest对象。我会创建一个自己的信号，提供一个user参数，并在执行删除操作的视图中发送这个信号，类似于：

# myapp/signals.py
from django.dispatch import Signal
my_post_delete = Signal(providing_args=['instance', 'user'])

# myapp/models.py
from myapp.signals import my_post_delete
...
my_post_delete.connect(notify_on_delete, sender=Node)

# myapp/views.py
from myapp.signals import my_post_delete
...
@login_required
def my_delete_view(request, ...)
    ...
    instance = Node.objects.get(...)
    instance.delete()
    my_post_delete.send(sender=Node, instance=instance, user=request.user)