python - Django - 'AnonymousUser' 对象不可迭代，因为我在上下文处理器中使用了用户过滤器

Question

我使用context_processorts.py将某种过滤器传递到整个项目中，但它仅在用户登录时有效，当没有用户登录时它会返回错误。这是我的文件:

context_processors.py

def include_user_favs(request, user_favs=None):
    if request.user.is_anonymous:
        pass
    else:
        user_favs = Favorite.objects.filter(user=request.user)

    context = {
        'user_favs': user_favs,
    }

    return (context)

然后包含在settings.py中，例如:

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(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',
                'fostania.context_processors.include_name_list',
                'fostania.context_processors.include_current_user',
                'fostania.context_processors.include_dress_need',
                'fostania.context_processors.include_all_ads',
                'fostania.context_processors.include_new_messages',
                'fostania.context_processors.include_user_favs',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

这就是我在 HTML 中使用的方式

home.html

                               {% if user_favs %}
                      {% for item in user_favs %}
                  {% if item.item == dress %}
                                                      <a href="{% url 'favorite_item' dress.id %}">
                  <img src="{% static 'img/star-yes.png' %}" title="مسح من  الفساتين المفضلة"></a>
{% else %}

                                <a href="{% url 'favorite_item' dress.id %}">
                  <img src="{% static 'img/star_no.png' %}" title="إضافة إلى الفساتين المفضلة"></a>

                          {% endif %}
                          {% endfor %}
              {% else %}
                                              <a href="{% url 'favorite_item' dress.id %}">
                  <img src="{% static 'img/star_no.png' %}" title="إضافة إلى الفساتين المفضلة"></a>
              {% endif %}

这是错误和回溯:

“AnonymousUser”对象不可迭代

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/

Django Version: 2.0.5
Python Version: 3.6.5
Installed Applications:
['django_filters',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'fostania_web_app.apps.FostaniaWebAppConfig']
Installed Middleware:
('whitenoise.middleware.WhiteNoiseMiddleware',
 'whitenoise.middleware.WhiteNoiseMiddleware',
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')



Traceback:

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\exception.py" in inner
  35.             response = get_response(request)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
  128.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
  126.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\python\Django\fostania\fostania_web_app\views.py" in home
  17.     user_favs = Favorite.objects.filter(user=request.user)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\manager.py" in manager_method
  82.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\query.py" in filter
  836.         return self._filter_or_exclude(False, *args, **kwargs)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\query.py" in _filter_or_exclude
  854.             clone.query.add_q(Q(*args, **kwargs))

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\sql\query.py" in add_q
  1253.         clause, _ = self._add_q(q_object, self.used_aliases)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\sql\query.py" in _add_q
  1277.                     split_subq=split_subq,

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\sql\query.py" in build_filter
  1187.             self.check_related_objects(join_info.final_field, value, join_info.opts)

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\models\sql\query.py" in check_related_objects
  1052.                 for v in value:

File "C:\Users\Dev3\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\utils\functional.py" in inner
  216.         return func(self._wrapped, *args)

Exception Type: TypeError at /
Exception Value: 'AnonymousUser' object is not iterable

Answer 1

您可以使用is_authenticated。

Read-only始终为 True 的属性(与始终为 False 的 AnonymousUser.is_authenticated 相对)

def include_user_favs(request, user_favs=None):
    if not request.user.is_authenticated:
        user_favs = Favorite.objects.filter(user=request.user)

    context = {
        'user_favs': user_favs,
    }

    return (context)