python之Django之扩展用户配置文件，对象不存在，如何创建空白记录

我按照下面创建了一个用户配置文件类，如果用户单击我的帐户页面并且他们没有记录，我会收到以下错误:

RelatedObjectDoesNotExist at /profile 
User has no userprofile. 
Exception Type: RelatedObjectDoesNotExist 
Exception Value:     
User has no userprofile. 

这是错误行

profile_form = ProfileForm(instance=request.user.userprofile)  

所以我想我需要尝试一下那个部分？但我不确定如何创建一条记录作为异常(exception)？

谢谢

模型.py

from __future__ import unicode_literals 
from django.db import models 
from django.contrib.auth.models import User 
from django.db.models.signals import post_save 
from django.dispatch import receiver 
from django.conf import settings 
# Create your models here. 
 
class UserProfile(models.Model): 
    mpls_m_subscriptions = models.CharField(max_length=50,verbose_name="MPLS Maintenance Subscription",choices=settings.SUBSCRIPTION_TYPE,blank=True,null=True) 
    user = models.OneToOneField(User, on_delete=models.CASCADE) 

View .py

@login_required 
@transaction.atomic 
def update_profile(request): 
    if request.method == 'POST': 
        profile_form = ProfileForm(request.POST, instance=request.user.userprofile) 
        if profile_form.is_valid(): 
            profile_form.save() 
            messages.success(request, ('Your profile was successfully updated!')) 
            return redirect('home:profile') 
        else: 
            messages.error(request, ('Please correct the error below.')) 
    else: 
        profile_form = ProfileForm(instance=request.user.userprofile) 
    return render(request, 'home/profile.html', { 
        'profile_form': profile_form 
    })     

请您参考如下方法:

我建议做以下两件事:

1. 创建数据迁移，为所有现有用户创建空白用户配置文件 Django Migrations Documentation
2. 为用户创建一个 post_save 信号处理程序，以便在创建新用户时自动创建配置文件对象 Django Signals