Question

我是Django的新手，我正在尝试创建一个注册表单。这是我模型的相关部分：

class UserProfile(models.Model):
    user = models.OneToOneField(User)

    university = models.ForeignKey('University')
    course_title = models.ForeignKey('Course_Title')

    class Meta:
        db_table = 'user_profile'

def create_user_profile(sender, instance, created, **kwargs):
    if created:
        UserProfile.objects.create(user=instance)

post_save.connect(create_user_profile, sender=User)

这是我正在使用的表格：

from django.contrib.auth.forms import UserCreationForm
from django import forms
from django.contrib.auth.models import User
from shelf.models import University, Course_Title, UserProfile

class RegistrationForm(UserCreationForm):

error_messages = {
    'duplicate_email': "A user with that e-mail already exists.",
    'email_mismatch': "The two e-mail fields didn't match.",
}

# An e-mail is being used instead of the usual Django username.
username = forms.EmailField(label="E-mail")
username2 = forms.EmailField(label="Confirm E-mail")
university = forms.ModelChoiceField(queryset=University.objects.all(), empty_label="Please choose a university")
course_title = forms.ModelChoiceField(queryset=Course_Title.objects.all(), empty_label="Please choose a course title")

class Meta:
    model = User
    fields = ("first_name", "last_name", "university", "course_title", "username", "username2")

    .
    .
    .

def save(self, commit=True):
    user = super(RegistrationForm, self).save(commit=False)
    user.save()
    user_profile = UserProfile(user=user, university=self.cleaned_data["university"], course_title=self.cleaned_data["course_title"])
    if commit:
        user_profile.save()
    return user_profile

而且，这是我的视图：

def index(request):
    if request.method == 'POST':
        form = RegistrationForm(request.POST)
        if form.is_valid():
            new_user = form.save()
            return HttpResponseRedirect("/")
    else:
        form = RegistrationForm() 

    return render(request, "shelf/register.html",  {'form': form,  })

我收到错误user_profile.university_id可能不是NULL。我已经看了很多为什么会发生这种情况，我理解为什么会这样。但我似乎无法解决它。

提前致谢。

Answer 1

看起来问题是由您的信号处理程序引起的：

def create_user_profile(sender, instance, created, **kwargs):
    if created:
        UserProfile.objects.create(user=instance) # no university here

post_save.connect(create_user_profile, sender=User)

请尝试禁用此处理程序并再次测试。

如果您需要信号处理程序，请尝试更改form.save方法：

def save(self, commit=True):
    user = super(RegistrationForm, self).save(commit=False) #this should trigger the signal handler to create a UserProfile instance, but not commit
    user_profile = user.get_profile()
    user_profile.university=self.cleaned_data["university"]
    user_profile.course_title=self.cleaned_data["course_title"]
    if commit:
        user.save()
        user_profile.save()

小心，如果你在shell中创建了一个用户，你仍然会得到同样的错误，我想也许你可以在UserProfile模型中为university和course_title字段添加默认值：

class UserProfile(models.Model):
    user = models.OneToOneField(User)

    university = models.ForeignKey('University', default=1)
    course_title = models.ForeignKey('Course_Title', default=1)

Answer 2

我遇到了同样的问题，但是我按照步骤

解决了这个问题

<强>模型

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

class UserProfile(models.Model):
    url = models.URLField()
    home_address = models.TextField()
    user = models.ForeignKey(User, unique=True)


def create_user_profile(sender, instance, created, **kwargs):
    if created:
        UserProfile.objects.create(user=instance)

post_save.connect(create_user_profile, sender=User)

查看

from django.contrib.auth.forms import UserCreationForm from django.contrib.auth.models import User, Group from django import forms from django.shortcuts import render_to_response from django.http import HttpResponse from django.template.context import RequestContext from django.views.decorators.csrf import csrf_protect class RegisterForm(UserCreationForm): permission_choices = ( ('1', 'test1'), ('2', 'test2'), ) email = forms.EmailField(required=False) first_name = forms.CharField(required=False) last_name = forms.CharField(required=False) url = forms.URLField() permission = forms.ChoiceField(choices=permission_choices) class Meta(UserCreationForm.Meta): model = User fields = ('first_name', 'last_name', 'url', 'username', 'email', 'password1', 'password2', 'permission') def save(self, commit=True): user = super(RegisterForm, self).save(commit=False) user_profile = user.get_profile() user.email = self.cleaned_data['email'] user.first_name = self.cleaned_data['first_name'] user.last_name = self.cleaned_data['last_name'] user.permission = self.cleaned_data['permission'] user_profile.url = self.cleaned_data['url'] if commit: user.save() user_profile.save() return user @csrf_protect def register(request): if request.method == 'POST': form = RegisterForm(request.POST) if form.is_valid(): new_user = form.save() if new_user.permission == 'q': try: new_user.groups.add(Group.objects.get(name='test1')) except Group.DoesNotExist: u = User.objects.get(pk=new_user.pk) u.delete() return HttpResponse('The Organisation you\'ve just choosed doesn\' exist') return HttpResponse('OK') else: form = RegisterForm() return render_to_response('registration/user.html', {'form': form}, context_instance=RequestContext(request))

Django中的UserCreationForm，当存在外键时有额外的字段

2 个答案: