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class UserProductlistView(ListView):
    template_name = 'productlist/userproductlistitem_list.html'
    model = UserProductListItem
    paginate_by = 20
    list = None
    formset = modelformset_factory(UserProductListItem, ProductlistItemForm, extra=0, max_num=20)
    deleteform = None

    def get_queryset(self):
        self.list = get_object_or_404(UserProductList, slug=self.kwargs.get('slug'))
        return UserProductListItem.objects.filter(productlist=self.list, productlist__user=self.request.user)

    def post(self, request, **kwargs):
        self.list = get_object_or_404(UserProductList, slug=self.kwargs.get('slug'))
        if request.POST.get('deletelist'):
            self.deleteform = ProductlistDeleteForm(request.POST, instance=self.list)
            if self.deleteform.is_valid():
                self.deleteform.instance.delete()
                messages.success(request, u'Список "%s" удален' % (self.list,))
                return redirect('userproductlist_list')
        if request.POST.get('subscribelist'):
            self.list.subscribe = not self.list.subscribe
            self.list.save()
            messages.success(request, u'Настройки списка "%s" изменены' % (self.list,))
            return redirect('userproductlist_list')
        return self.get(request, **kwargs)