扩展表时主键必须唯一

Question

我正在尝试添加扩展用户模型。 我不断收到此错误： Primary key is not unique 。

class UserExtended(models.Model):
        user = models.OneToOneField(User, on_delete=models.CASCADE,parent_link=True,primary_key=True)

如果我删除primary_key=True那么我会收到错误instance.userextended.id does not exists ，当然现在我没有id了。

我该如何解决？

Answer 1

在models.py中

from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

class UserExtended(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)

    # Then you can also add fields like these to extended model
    profilepic = models.ImageField(upload_to='uploads/users/%Y/%m/%d/', null=True, blank=True)
    designation = models.CharField(max_length=200,null=True, blank=True)
    about = models.TextField(null=True, blank=True)
    website = models.URLField(null=True,blank=True)


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

@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        UserExtended.objects.create(user=instance)

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    instance.userextended.save()

现在，无论何时创建新用户，都会自动为该用户创建扩展记录。

同样，如果保存了用户记录，则它将在扩展记录中自动更新。