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@fission6
Forked from dgouldin/gist:1207636
Created November 28, 2012 20:32
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Django templatetag to output the current page's querystring updated with the specified values including context variables.
from django import template
register = template.Library()
class UpdateQuerystringNode(template.Node):
def __init__(self, **kwargs):
self.kwargs = kwargs
def render(self, context):
query_dict = context['request'].GET.copy()
for k, v in self.kwargs.items():
try:
variable = template.Variable(v).resolve(context)
except template.VariableDoesNotExist:
variable = v
finally:
query_dict[k] = variable
return query_dict.urlencode()
@register.tag
def update_querystring(parser, token):
"""
From /?foo=bar, {% update_querystring foo=baz %}
will output foo=baz.
or use a context variable
{% update_querystring foo=request.user %}
foo=whatever
where whatever is the current user's username.
"""
bits = token.split_contents()
return UpdateQuerystringNode(**dict([bit.split('=') for bit in bits[1:]]))
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