django - 如何在涉及 request.user.is_authenticated() 和 bool 对象不可调用的 Python Django 中修复此错误？

Question

我正在尝试为每个用户制作个人资料页面。我添加了一个代码来检查用户是否已登录并进行重定向(参见下面代码的第 12 行)。

from django.shortcuts import render
from django.contrib.auth import login, authenticate
from django.contrib.auth.forms import UserCreationForm
from django.http import HttpResponseRedirect, HttpResponse

from .models import Account, ForSale, WTB

from mysite.forms import MyRegistrationForm

def signup(request):
    if request.user.is_authenticated():
        return HttpResponseRedirect('/user/')
    else:
        if request.method == 'POST':
            form = MyRegistrationForm(request.POST)
            if form.is_valid():
                form.save()
                return HttpResponseRedirect('/user/')

        context = {}
        context.update(csrf(request))
        context['form'] = MyRegistrationForm()

        return render(request, 'signup.html', context)

def index(request):
    return render(request, 'index.html')

但是，在访问站点上的/signup/时，我收到以下调试消息:

TypeError at /signup/
'bool' object is not callable
Request Method: GET
Request URL:    http://url:8000/signup/
Django Version: 2.0
Exception Type: TypeError
Exception Value:    
'bool' object is not callable
Exception Location: /www/mysite.com/mysite/views.py in signup, line 13
Python Executable:  /usr/bin/python3
Python Version: 3.5.2
Python Path:    
    ['/www/mysite.com',
    '/usr/lib/python35.zip',
    '/usr/lib/python3.5',
    '/usr/lib/python3.5/plat-x86_64-linux-gnu',
    '/usr/lib/python3.5/lib-dynload',
    '/usr/lib/python3.5/site-packages',
    '/usr/local/lib/python3.5/dist-packages',
    '/usr/lib/python3/dist-packages']
Server time:    Sun, 3 Dec 2017 18:07:54 -0800

Answer 1

在旧版本的 Django 中 request.user.is_authenticated 是一种方法。它现在是一个属性，不再需要括号。如果您将代码更改为:

如果 request.user.is_authenticated:

它应该按预期工作。

有关详细信息，请参阅此处的文档:https://docs.djangoproject.com/en/1.11/ref/contrib/auth/#django.contrib.auth.models.User.is_authenticated