Django - reversing wrapped view functions

Question

I am trying to incorporate django-schedule into my project. Django-schedule's source is here. I don't like the urls, because they all capture a slug. My project will only allow one calendar per user, so it doesn't make sense to capture the slug. So, I wrapped the django-schedule views like this (look up the slug using the current user, and pass it to django-schedule's views):

from schedule.views import calendar_by_periods
from schedule.models import Calendar
from schedule.periods import Month

def cal_by_periods_wrapper(view):
    def new_view(request, *args, **kwargs):
        kwargs['calendar_slug'] = Calendar.objects.get_calendars_for_object(obj=request.user, distinction="owner")[0].slug
        return view(request, *args, **kwargs)
    return new_view

And here is the relevant section from urls.py:

urlpatterns = patterns('',
                url(r'^$',
                    cal_by_periods_wrapper(calendar_by_periods),
                           name = "month_calendar",
                           kwargs={'periods': [Month], 'template_name': 'schedule/calendar_month.html'}),

This works fine until it hits one of the template tags included with django-schedule, prev_url:

@register.simple_tag
def prev_url(target, slug, period):
    return '%s%s' % (
        reverse(target, kwargs=dict(calendar_slug=slug)),
            querystring_for_date(period.prev().start))

This function raises:

TemplateSyntaxError at /teacher/calendar/

Caught an exception while rendering: Reverse for 'month_calendar' with arguments 
'()' and keyword arguments '{'calendar_slug': u'asdf'}' not found.

How can I wrap this view and still make the reverse call work?

Answer 1

This has nothing to do with wrapping the function. It's just that you no longer have a URL with the name 'month_calendar' which takes a 'calendar_slug' argument. Either define one in your urlconf, or edit the templatetag.

Edit after comment Yes but the 'reverse' call is still passing a slug argument, and there's no 'month_calendar' url which takes one, so the reverse match fails.