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django - 如何在 Django 中增加会话内部？

问题描述

我尝试在会话内创建一个计数器，但我失败了。会话打印出我添加一次的结果，当我想再次添加新评论时，它不会增加进程。评论将被添加，但计数器仍然等于一，所以我怎样才能增加会话：

def post(self, request, user_slug, *args, **kwargs):
    my_question = UserAsking.objects.get(ask_slug=user_slug)
    userprof = UserProfile.objects.get(userasking__ask_slug=user_slug)
    comment_form = CommentForm(request.POST, instance=request.user)
    name = "%s %s" % (self.request.user.first_name, self.request.user.last_name)
    username = self.request.user.username
    logo = self.request.user.userprofile.logo.url
    if comment_form.is_valid():
        comment_request = self.request.POST.get('comment', None)
        comment_form = Comment.objects.create(comment=comment_request,
                                              userasking_id=my_question.id,
                                              userprofile_id=userprof.id,
                                              name=name,
                                              username=username,
                                              logo=logo,
                                              comment_slug=my_question.ask_slug
                                              )
        q = UserAsking.objects.get(ask_slug=my_question.ask_slug)
        c = comment_form
        u = comment_form.userprofile
        if 'notify_counts' in request.session:
            counter = request.session.get('notify_counts', 0)
            request.session['notify_counts'] = counter + 1
            request.session.save()
            print('%s is commented your post: %s and comment is (%s) notify = %i'
                  %(u, q, c, counter))
        return redirect('community:question_view', user_slug)
        # return redirect('community:question_view', comment_form.userasking.ask_slug)
    return render(request, 'community/question_view.html', {'comment_form': comment_form})

标签： djangosessionincrement

解决方案

Django 会在 session 被修改后自动保存到 session 数据库中，所以你不用手动保存，看看：<em>什么时候保存 session [Django-Doc]。

def post(request，...):
   ...
   notify_counts = request.session.get('notify_counts')
   if notify_counts is None:
       request.session['notify_counts'] = 1
   else:
       request.session['notify_counts'] +=1

你也可以使用try...except如下模式：</p> 

def post(request, ...):
    try:
        request.session['notify_counts'] +=1
    except KeyError:
        request.session['notify_counts'] = 1

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