Django 'logout' TypeError: 'AnonymousUser' 对象不可迭代

Question

美好的一天，

我在 Django 3.0 中遇到了身份验证问题。

我的项目取决于为用户的每项操作（如发布、评论、点赞、收藏等）打分。

我正在使用自定义 context_processors 在多个模板中获取这些值。

我的问题：当我登录时……一切正常（管理面板、新帖子、新评论……）。

当我退出时..所有项目都疯了，所有页面都不起作用..出现以下错误：

'AnonymousUser' object is not iterable

Models.py

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    likes = models.ManyToManyField(User, related_name='likes', blank=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    favourite = models.ManyToManyField(User, related_name='favourite', blank=True)

    def __str__(self):
        return self.title

class Comment(models.Model):
    user = models.ForeignKey(
        User, on_delete=models.CASCADE, related_name='commenter')
    content = models.TextField(verbose_name='Comment')
    post = models.ForeignKey(
        Post, on_delete=models.CASCADE, related_name='comments')

    def __str__(self):
        return '{} Commented On {}.'.format(self.user, self.post)

Views.py

def logout_user(request):
    logout(request)
    return render(request, 'user/logout.html', {})

context_processors.py

def extra_cp(request):
    categories = Category.objects.all()

    postsperuser = Post.objects.filter(author=request.user)
    postsperusercount = Post.objects.all().annotate(posts_count=Count('title')).filter(author=request.user)
    postspoints = postsperusercount.aggregate(posts_score=Count('posts_count') * 1000)

    commentsperuser = Comment.objects.filter(user=request.user)
    commentsperusercount = Comment.objects.all().annotate(comments_count=Count('content')).filter(user=request.user)
    commentspoints = commentsperusercount.aggregate(comments_score=Count('comments_count') * 350)

    total_points = postspoints['posts_score'] + commentspoints['comments_score']

    comment_list = Comment.objects.filter(user=request.user)

    context = {
        'categories': categories,
        'postsperuser': postsperuser,
        'postspoints':postspoints,
        'commentsperuser':commentsperuser,
        'commentspoints':commentspoints,
        'comment_list': comment_list,
        'total_points': total_points,
                    }
    return context

settings.py

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR + '/templates/', ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
                'common.context_processors.extra_cp'

            ],
        },
    },
]

回溯错误：

Django version 3.0.3, using settings 'my_blog.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Internal Server Error: /
Traceback (most recent call last):
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "D:\Private\PythonProjects\ProCoers02\src\blog-django-ar-master\src\blog\views.py", line 59, in HomePageView
    return render(request, 'blog/home.html', {})
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\template\loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\template\backends\django.py", line 61, in render
    return self.template.render(context)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\template\base.py", line 169, in render
    with context.bind_template(self):
  File "C:\Users\clt\AppData\Local\Programs\Python\Python38-32\lib\contextlib.py", line 113, in __enter__
    return next(self.gen)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\template\context.py", line 246, in bind_template
    updates.update(processor(self.request))
  File "D:\Private\PythonProjects\ProCoers02\src\blog-django-ar-master\src\common\context_processors.py", line 19, in extra_cp
    postsperuser = Post.objects.filter(author=request.user)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\query.py", line 904, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\query.py", line 923, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\sql\query.py", line 1350, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\sql\query.py", line 1377, in _add_q
    child_clause, needed_inner = self.build_filter(
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\sql\query.py", line 1284, in build_filter
    self.check_related_objects(join_info.final_field, value, join_info.opts)
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\db\models\sql\query.py", line 1124, in check_related_objects
    for v in value:
  File "D:\Private\PythonProjects\ProCoers02\lib\site-packages\django\utils\functional.py", line 225, in inner
    return func(self._wrapped, *args)
TypeError: 'AnonymousUser' object is not iterable
[02/Apr/2020 00:23:21] "GET / HTTP/1.1" 500 137245

我相信解决方案是在 django 会话中。我尝试了几次并在这里搜索了多个问题和答案，但我失败了。

有人可以帮忙吗？

提前感谢您的支持......

Answer 1

经过简单的修改就可以了：

1. 将用户定义为user.request.is_authenticated。
2. 在 if 语句之前将上下文添加为空字典。
3. 使用 if 语句，如下所示。
4. 在 if 语句中移动上下文。
5. 保持返回上下文不变。

context_processors.py

def extra_cp(request):
    categories = Category.objects.all()
    user = request.user.is_authenticated
    context = {}

    if user:
        postsperuser = Post.objects.filter(author=request.user)
        postsperusercount = Post.objects.all().annotate(posts_count=Count('title')).filter(author=request.user)
        postspoints = postsperusercount.aggregate(posts_score=Count('posts_count') * 1000)

        commentsperuser = Comment.objects.filter(user=request.user)
        commentsperusercount = Comment.objects.all().annotate(comments_count=Count('content')).filter(user=request.user)
        commentspoints = commentsperusercount.aggregate(comments_score=Count('comments_count') * 350)

        total_points = postspoints['posts_score'] + commentspoints['comments_score']

        comment_list = Comment.objects.filter(user=request.user)

        context = {
            'categories': categories,
            'postsperuser': postsperuser,
            'postspoints': postspoints,
            'commentsperuser': commentsperuser,
            'commentspoints': commentspoints,
            'comment_list': comment_list,
            'total_points': total_points,
        }

    return context

请注意：

@Omonbude Emmanuel 是真的 .. 它必须是 request.user.is_authenticated() 因为使用 Django 3.0。

但它在没有() 的情况下与request.user.is_authenticated 一起工作......我不知道为什么......

非常感谢大家，

最好的问候，

Answer 2

您在上下文处理器中过滤用户。 它仅在用户登录时才起作用。 您可以使用 if 语句来检查他们是否已登录或使用 try 和 except。