How can I get previous and next objects from a filtered, ordered queryset?

Question

I have a page based on a model object, and I want to have links to the previous and next pages. I don\'t like my current solution because it requires evaluating the entire query

Answer 1

Check out django-next-prev, I wrote it to solve this exact problem. In this case:

from next_prev import next_in_order, prev_in_order

def get_prev_and_next_page(current_page):
    page_qs = Page.objects.all()  # this could be filtered, or ordered
    prev_page = prev_in_order(current_page, page_qs)
    next_page = next_in_order(current_page, page_qs)
    return (prev_page, next_page)