Pagination with ordering and other get variables - django

Question

In a class based ListView, while rendering i want to dynamically change the no of items shown per page and the sorting order of those items.
I referred to this question and the answer by skoval00 works for me when i change the ordering and change the pages. But as soon as i change the no of items per page, my ordering is lost.
For ex: my generic view links to http://127.0.0.1:8000/marketplace/.
If i set the pagination to 10 items per page.
The url changes to http://127.0.0.1:8000/marketplace/?paginate_by=10
But now if i change my ordering too, i expect something like
http://127.0.0.1:8000/marketplace/?paginate_by=10&ordering=end_date
but i get
http://127.0.0.1:8000/marketplace/?ordering=end_date
And the pagination changes to the default value.
Same thing happens vice-versa. If i order first and then change pagination, then i lose the ordering once the pagination changes.
How do i preserve the first argument while adding the second one?
Here is the relevant class in views.py
class CatalogueListView(ListView):
model = Catalogue
context_object_name = 'catalogues'
template_name = 'marketplace/catalogue_list.html'
paginate_by = 5
ordering = ['end_date']
def get_queryset(self):
if self.request.GET.get('ordering'):
ordering = self.request.GET.get('ordering')
else:
ordering = 'end_date'
query_set = Catalogue.objects.filter(admin_approved=True, end_date__gt=timezone.now()).order_by(ordering)
return query_set
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
if self.request.GET.get('paginate_by'):
context['paginate_by'] = self.request.GET.get('paginate_by')
else:
context['paginate_by'] = self.paginate_by
if self.request.GET.get('ordering'):
context['ordering'] = self.request.GET.get('ordering')
else:
context['ordering'] = self.ordering
return context
def get_paginate_by(self, queryset):
return self.request.GET.get('paginate_by', self.paginate_by)
ans