Question

我有一个简单的聊天应用程序，我自定义身份验证后端只使用名称。到目前为止，它正在运行，用户使用Django login（）登录。

现在我遇到了一个问题，即分配一个用户出现此错误，然后停止该应用程序的其余部分：

    ValueError: Cannot assign "<SimpleLazyObject:
    <django.contrib.auth.models.AnonymousUser 
    object at 0x7f7db7b71e80>>": "PChat.user" must be a "User" instance.

View.py

from chatbot import settings
from django.shortcuts import render
from django.http import HttpResponse, JsonResponse,HttpResponseRedirect
from django.views.decorators.csrf import csrf_exempt
from django.contrib.auth import authenticate, login
from Pchat.models import  PChat
from django.contrib.auth.models import User


@csrf_exempt 
def P_home(request):
    context= locals()
    template= 'P_home.html'
    return render(request,template,context)

@csrf_exempt 
def P_chat(request):
   context= locals()
   template= 'P_chat.html'
   return render(request,template,context)

@csrf_exempt 
def LogIIn(request):
  if request.method == "POST":
      name = request.POST.get('param1')
      user = authenticate(username=name)
      login(request, user)
  return HttpResponse("OK")

  @csrf_exempt 

  def Post(request):
     if request.method == "POST":
       msg = request.POST.get('param1')
       if request.user.is_authenticated():
          c = PChat(user=request.user, message=msg)
          c.save()
          return JsonResponse({ 'msg': msg, 'user': c.request.user })
       else:
        return HttpResponse("Account None")

models.py

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

  class PChat(models.Model):
      created = models.DateTimeField(auto_now_add=True)
      user = models.ForeignKey(User)
      message = models.CharField(max_length=200)

      def __unicode__(self):
             return self.message

auth_backend.py

   from django.contrib.auth.backends import ModelBackend
   from django.contrib.auth.models import User

   class PasswordlessAuthBackend(ModelBackend):
        """Log in to Django without providing a password."""
      def authenticate(self, username=None):
         try:
             return User.objects.get(username=username)
         except User.DoesNotExist:
             return None

      def get_user(self, user_id):
          try:
             return User.objects.get(pk=user_id)
          except User.DoesNotExist:
             return None

Answer 1

你有问题：

c = PChat(user=request.user, message=msg)

request.user不是User对象。首先检查request.user是否为实际用户。

if request.user.is_authenticated():
  c = PChat(user=request.user, message=msg)
       c.save()   
       return JsonResponse({ 'msg': msg, 'user': c.user.username })
else:
    return JsonResponse({ 'msg': 'user is not logged in' })

修改

def Post(request): if request.method == "POST": msg = request.POST.get('param1') if request.user.is_authenticated(): c = PChat(user=request.user, message=msg) c.save() return JsonResponse({ 'msg': msg, 'user': c.request.user }) return HttpResponse("Account None")

Answer 2

好的，您的代码有几处错误：

1）在 P_home 和 P_chat 中，您使用的是locals（），不建议这样做。你必须尽可能避免这种情况。您需要明确传递给 context 字典的数据。

2）在 LogIIn 视图中，当用户不是None时，您必须调用登录功能。 [1]

3）最终错误发生在发布视图中，您必须首先询问 request.user 是否已使用 request.user.is_authenticated（）进行身份验证功能。如果用户已通过身份验证，那么 request.user 是正常的用户实例，在其他情况下，它将是 AnonymousUser ，它们都是不同的的东西。 PChat 模型中的字段用户期待用户而非 AnonymousUser 实例。

[1] https://docs.djangoproject.com/en/1.11/topics/auth/default/#how-to-log-a-user-in

无法在Django中分配用户

2 个答案: