python - “SessionStore”对象没有属性 'GET'

Question

此代码有什么问题，它会生成以下错误:

>   'SessionStore' object has no attribute 'GET'

这是代码:

def blog_detail(request, blog_slug):
    blog = get_object_or_404(Blog, slug=blog_slug)
    session_key = 'blog_views_{}'.format(blog.slug)
    if not request.session.GET.get('session_key', False)
        blog.blog_views += 1
        blog.save()
        request.session['session_key'] = True

    return render(request, 'blogs/blog-detail.html', {'blog':blog})

我认为我使用 request.session 做错了。你能帮我解决这个问题吗，谢谢。

编辑:回溯

Environment:


Request Method: GET
Request URL: http://localhost:8000/dramatically-productivate-global-functionalities-whereas-reliable-internal-or-organic-sources

Django Version: 2.2.1
Python Version: 3.7.2
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'blogs',
 'users',
 'crispy_forms']
Installed Middleware:
['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 "E:\Practice\new-blog\lib\site-packages\django\core\handlers\exception.py" in inner
  34.             response = get_response(request)

File "E:\Practice\new-blog\lib\site-packages\django\core\handlers\base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "E:\Practice\new-blog\lib\site-packages\django\core\handlers\base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "E:\Practice\new-blog\src\blogs\views.py" in blog_detail
  53.     if not request.session.GET.get('session_key', False):

Exception Type: AttributeError at /dramatically-productivate-global-functionalities-whereas-reliable-internal-or-organic-sources
Exception Value: 'SessionStore' object has no attribute 'GET'

Answer 1

这里有两个错误:

• 您不能使用 request.session.GET.get(..) 因为 SessionBase 对象没有没有 GET 属性；和
• 您使用了字符串文字 'session_key' 而不是标识符。

你可能想写:

def blog_detail(request, blog_slug):
    blog = get_object_or_404(Blog, slug=blog_slug)
    session_key = 'blog_views_{}'.format(blog.slug)
    if not request.session<b>.get(session_key</b>, False<b>)</b>:
        blog.blog_views += 1
        blog.save()
        request.session[<b>session_key</b>] = True

    return render(request, 'blogs/blog-detail.html', {'blog':blog})

我们可以使 if 语句更短一些，因为 .get(..) 默认情况下返回具有真实性的 None 错误以及:

def blog_detail(request, blog_slug):
    blog = get_object_or_404(Blog, slug=blog_slug)
    session_key = 'blog_views_{}'.format(blog.slug)
    if not request.session.get(session_key):
        blog.blog_views += 1
        blog.save()
        request.session[session_key] = True

    return render(request, 'blogs/blog-detail.html', {'blog':blog})

所以这里我们使用 request.session.get(..) 并使用 session_key 标识符，而不是文字。如果我们使用'session_key'，我们只需询问 session 是否有 key 'session_key'，而不是'blog_views_some-title'。