在Django中使用Pre_delete信號

Question

在我的應用程序中，我想跟蹤所有被刪除的問題。所以我在模型文件中創建了類（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 

當用戶試圖刪除問題該刪除功能被稱爲：

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

我懷疑是我怎樣才能讓Django的填充我創建了新表的pre_delete信號。

〜新手試圖沉重的任務〜 感謝提前:)

Answer 1

您可以通過定義開始的receiver要使用：

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() 

然後定義你的接收機裝飾：

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

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

一起加入：

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() 

您可以將此函數放入您的models.py文件中，因爲您知道它將被正確加載和連接。

雖然問題是，你沒有得到用戶請求刪除。由於可以從django api（命令行，shell等）中觸發刪除，該刪除沒有與其關聯的請求。出於這個原因，如果將用戶與刪除一起存儲非常重要，則可能希望避免使用信號。