在django中使用Pre_delete信号

Question

在我的应用程序中,我想跟踪所有正在删除的问题.所以我在我的模型文件中创建了一个类(表).

class Deleted(models.Model):
question = models.IntegerField(null=True, blank=True)#id of question being deleted
user = models.IntegerField(null=True, blank=True)#id of user deleting the question
dt = models.DateTimeField(null=True, blank=True)#time question is deleted

当用户尝试删除问题时调用此删除功能:

def delete_questions(request, user, questions):
  for q in questions:
        q.delete()

我的疑问是我如何制作django的pre_delete信号来填充我创建的新表.

〜新手尝试重大任务〜先谢谢:)

Answer 1

首先定义要使用的接收器:

def log_deleted_question(sender, instance, using, **kwargs):
    d = Deleted()
    d.question = instance.id
    d.dt = datetime.datetime.now() # consider using auto_now=True in your Deleted definition
    # not sure how you'd get the user via a signal, 
    # since it can happen from a number of places (like the command line)
    d.save()

然后定义你的接收器装饰器:

from django.db.models.signals import pre_delete
from django.dispatch import receiver

@receiver(pre_delete, sender=Question, dispatch_uid='question_delete_log')

完全添加:

from django.db.models.signals import pre_delete
from django.dispatch import receiver

@receiver(pre_delete, sender=Question, dispatch_uid='question_delete_signal')
def log_deleted_question(sender, instance, using, **kwargs):
    d = Deleted()
    d.question = instance.id
    d.dt = datetime.datetime.now() 
    d.save()

您可以将此功能放在您的models.py文件中,因为您知道它将被正确加载和连接.

但问题是,您没有让用户请求删除.由于可以从django api(命令行,shell等)触发删除,因为它没有与之关联的请求.因此,如果将用户与删除一起存储至关重要,则可能需要避免使用信号.