会话的一个视图到另一个视图的django变量 [英] django variable of one view to another from session

问题描述

我对此很困惑，我也不知道该怎么做.我有一个视图，其中列出了新闻列表中的所有新闻.为了显示新闻，我已经在列表视图中传递了上下文数据.这是我的观点

I m very confused on this and I dont have any idea how to do this.. I have a view where I have listed all the news from my news table. To display the news I have passed context data in list view. Here is my view

class SingleNewsView(ListView):
model = News
form_class = SearchForm
template_name = "single_news.html"

# def post(self, request, **kwargs):
#   print "request"
#   form = SearchForm(request.user)



def get(self, request, pk, **kwargs):

    #form = SearchForm(request.user)
    self.pk = pk

    self.pub_from = request.GET.get('pub_date_from',False)
    self.pub_to = request.GET.get('pub_date_to',False)
    self.crawlers = request.GET.get('crawler',False)


    print self.crawlers


    return super(SingleNewsView,self).get(request,pk, **kwargs)



def get_context_data(self, **kwargs):

    context = super(SingleNewsView,self).get_context_data(**kwargs)
    context["form"] = SearchForm
    if self.pub_from and self.pub_to and self.crawlers:
        context["something"] = News.objects.filter(category_id=self.pk).filter(published_date__range=(self.pub_from,self.pub_to), crawler=self.crawlers)
    else:
        context["something"] = News.objects.filter(category_id=self.pk)

    return context

并且我写了我从django doc引用的视图，以csv格式下载新闻.在我的第一个视图中，我已传递context ["something"]以显示模板中的新闻列表.现在，我想要的是在csv中下载该新闻.我为此写了一个观点

and I have written view that I referenced from django doc to download the news in csv format.. I have also included a search form to filter the news. In my first view I have passed context["something"] to display the list of news in the template. Now what I want is to download that news in csv. I have written a view for this

def CSVView(request):

response = HttpResponse(content_type="text/csv")
response["Content-Disposition"] = 'attachment; filename=somefilename.csv"'

some_val = request.session["something"]
print some_val
print "this"

writer = csv.writer(response)


writer.writerow(some_val)
return response

这是我下载csv的下一个视图.在这里，我要尝试的是下载过滤器之后的新闻.在我的第一个视图中，context ["something"]给出了新闻列表.我做了所有，但不知道如何得到它.最后，我试图从会话中获取contxt ["something"]的值，但是我也失败了.如何将一个视图的价值带到另一个视图.或者，任何人都有更好的主意，我该如何下载由context ["something"]返回的新闻.我究竟做错了什么.

This is my next view to download the csv. Here what I am trying to do is to download the news that come after filter. In my first view context["something "] gives the list of news. I did all but dont know how to get it. Lastly I m trying to get the value of contxt["something"] from session but I am failed in that too. How can I get the value of one view to another. Or anyone have better idea how can I download the news that is returned by context["something"]. What am I doing wrong.

推荐答案

在 context 中设置数据不会将其放入会话中.您需要在会话中设置数据以将其存储在其中.同样，直接在会话中存储对象也不是一个好主意.您可能需要序列化它们.

Setting data in context does not put it in session. You need to set data in session to store it there. Also, storing objects directly in session is not a good idea. You may have to serialize them.

更好的方法是创建要加入会话的对象的 pk 个列表.

Better way would be create list of pks of objects you want into session.

类似的东西:

def get_context_data(self, **kwargs):

    context = super(SingleNewsView,self).get_context_data(**kwargs)
    context["form"] = SearchForm
    if self.pub_from and self.pub_to and self.crawlers:
        qs = News.objects.filter(category_id=self.pk).filter(published_date__range=(self.pub_from,self.pub_to), crawler=self.crawlers)
    else:
        qs = News.objects.filter(category_id=self.pk)
    context["something"] = qs
    #set data in session
    self.request.session['something_pks'] = [ i.pk for i in qs ]
    return context

然后在 CSVView 中，您可以通过`request.session ['something_pks']获取它们并查询对象.

Then in CSVView you can get them with `request.session['something_pks'] and do the query for objects.

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