Add django.core.paginator.Page.part_page_range() method

[BobDu]

Class Pagination have a attribute page_range,
it's very useful when I want to write the other page link in the html.
We only need write in html like

<!-- contacts is a instance of Page class -->
{% for p in contacts.paginator.page_range %}
<li>
    <a href="{% url 'admin_user_index' %}?&page={{ p }}">
        {{ p }}
    </a>
</li>
{% endfor %}

But, when the pages is too more, for example 1000, Things are going to get scary.

So, I suggest insert a method part_page_range() for class Page.

For example,
When the contacts.paginator.num_pages =1000,
and the contacts.number =500,
I can use the

contacts.part_page_range(5)

to acquire a range instance range(498, 503).
I think Django will be more handy after insert this method.

[Tim Graham]

I'm not understanding the purpose of the new method. Can you demonstrate example usage? The patch would also required tests and documentation.

[Carlton Gibson]

The idea here is to generate a subset of page links for a navigation aid right?

Something like (in HTML links):

1, 2, ... 498, 499, 500, 501, 502, 503, ... 9999, 1000

Rather than just outputting all 1000 links at once.

First question is, is this something we should add in core? (Maybe. Not immediately sure what to say.)

But more, there are already community solutions that do this.

Django REST Framework provides utilities that do just this for the pagination of it's Browsable API templates.
(See methods called from ​`PageNumberPagination.get_html_context()`.)

I imagine there will be other solutions also built around Django's Paginator. Before doing anything in core it would be good to consider what those are(?) (Even if that's only for implementation ideas.)

[Tim Graham]

Solved by #25513?

[Tim Graham]

Discussion can continue but closing for now as it's not immediately obvious to me that the proposed method is suitable.

[Bob Du]

Replying to Tim Graham:

Solved by #25513?

Yes, I saw that a similar feature was merged in #25513 to solve the problem. Thanks the community’s support