django variable of one view to another from session - django

Question

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
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
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.

Answer 1

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.
Better way would be create list of pks of objects you want into session.
Something like:
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
Then in CSVView you can get them with `request.session['something_pks'] and do the query for objects.