query_string.py

from django import template

register = template.Library()


@register.simple_tag
def url_encode(request, **kwargs):
    """
        For example, on the page, we have
            1. filters,
            2. pagination,
            3. sorting.
        we need to unite the url for each of these actions
        through the ampersand, and they should not be repeated.

        How it use:
            For integer values
            {% url_encode request url_key=url_value %}

            For string values
            {% url_encode request url_key='url_value' %}

        Example for pagination:
            {% url_encode request page=page %}

        We can add more parameters separated by a space:
            {% url_encode request order_by='price' ordering='asc' %}
    """
    dict_ = request.GET.copy()
    for key, value in kwargs.iteritems():
        dict_[key] = value

    return dict_.urlencode()