收到错误 -> 'NoneType' 对象没有属性 'delete'

Question

我正在尝试使用 DJANGO 的“管理员”门户手动删除“配置文件”，但是当我在选择一些配置文件后单击删除时，我收到一个错误，因为 -> 'NoneType' 对象没有属性“删除”

我在我的代码中使用信号。

signals.py 代码：-

from .models import Profile
from django.contrib.auth.models import User
from django.db.models.signals import post_save, post_delete


def createProfile(sender, instance, created, **kwargs):
    if created:
        user = instance
        profile = Profile.objects.create(
            user = user,
            username = user.username,
            email = user.email,
            name = user.first_name,
        ) 


def updateUser(sender, instance, created, **kwargs):

    profile = instance
    user = profile.user

    if created == False:
        user.first_name = profile.name
        user.username = profile.username
        user.email = profile.email
        user.save()



def deleteUser(sender, instance, **kwargs):
    user = instance.user
    user.delete()


post_save.connect(createProfile, sender = User)
post_save.connect(updateUser, sender = Profile)
post_delete.connect(deleteUser, sender = Profile)

models.py 代码：-

from django.db import models
from django.contrib.auth.models import User
import uuid

# Create your models here.

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=200, blank = True, null = True)
    location = models.CharField(max_length=200, blank = True, null = True)
    username = models.CharField(max_length=200, blank = True, null = True)
    email = models.EmailField(max_length=500, blank=True, null = False)
    short_intro = models.CharField(max_length=200, blank=True, null=True)
    bio = models.TextField(blank=True, null=True)
    profile_image = models.ImageField(null = True, blank = True, upload_to = 'profiles/', default = 'profiles/user-default.png')
    social_github = models.CharField(max_length=200, blank = True, null = True)
    social_twitter = models.CharField(max_length=200, blank = True, null = True)
    social_linkedin = models.CharField(max_length=200, blank = True, null = True)
    social_youtube = models.CharField(max_length=200, blank = True, null = True)
    created = models.DateTimeField(auto_now_add=True)
    id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True, editable=False) 

    def __str__(self):
        return str(self.username)



class Skill(models.Model):
    owner = models.ForeignKey(Profile, on_delete=models.CASCADE, null = True, blank = True)
    name = models.CharField(max_length=200, null=True, blank = True)
    description = models.TextField(null = True, blank = True)
    created = models.DateTimeField(auto_now_add=True)
    id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True, editable=False) 

    def __str__(self):
        return str(self.name)

我不知道，为什么会出现这个错误，谁能解决？

Answer 1

您正在删除Profile，但Profile 没有关联用户，因为user 是NULL/None。

您可以通过以下方式使您的信号更安全：

def deleteUser(sender, instance, **kwargs):
    user = instance.user
    if user:
        user.delete()