django MultiValueDictKeyError while requesting get object

Question

I have made a form to filter ListView

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

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

        pub_from = request.GET['pub_date_from']
        pub_to = request.GET['pub_date_to']
        
        return super(SingleNewsView,self).get(request,pk, **kwargs)

My form fields are pub_date_from and pub_date_to. When I run the site it says:
MultiValueDictKeyError .

I don't know what's going on. When I remove the two line of getting pub_from and pub_to the site works fine. I want these two values to filter the queryset.

Answer 1

On first request there is no form data submitted so request.GET would not have any data. So doing request.GET['pub_date_from'] will fail. You shall use .get() method

pub_from = request.GET.get('pub_date_from')
pub_to = request.GET.get('pub_date_to')

If these keys are not in the dict, will return None. So handle the such cases appropriately in your code.

Also, if you want to filter objects for ListView add get_queryset() method to return filtered queryset as explained here Dynamic filtering