Django - 扩展用户配置文件，对象不存在，如何创建空白记录？

Question

我按照下面创建了一个用户配置文件类，如果用户点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记录作为例外？

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)

views.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
    })    

Answer 1

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

Answer 2

您必须检查第一个用户是否存在

@login_required
@transaction.atomic
def update_profile(request):
    if request.method == 'POST':
        if request.user.userprofile is None:
            user_profile = UserProfile(user=request.user)
            user_profile.save
        ...