Django QueryString patch template tag

example.html

 <a href="?{% qspatch page=clients.paginator.num_pages %}"><span>{{ clients.paginator.num_pages }}</span></a>

qspatch.py

from django.template import Library


register = Library()


@register.simple_tag(takes_context=True)
def qspatch(context, **kwargs):
    qs = context.request.GET.copy()

    for k, v in kwargs.items():
        if k in qs:
            qs.pop(k)
        qs[k] = v

    return qs.urlencode()