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Using reverse() to do redirects

Author:
ubernostrum
Posted:
August 24, 2007
Language:
Python
Version:
.96
Tags:
urls reverse redirects
Score:
5 (after 5 ratings)

When I initially set up my blog, I put together the archives with URL patterns like so:

  • /weblog/2007/ goes to archive_year
  • /weblog/2007/08/ goes to archive_month
  • /weblog/2007/08/24/ goes to archive_day
  • /weblog/2007/08/24/some-slug goes to object_detail

The same patterns held for links, only the prefix was /links/ instead of /weblog/.

For a forthcoming redesign/rewrite, I'm switching to using abbreviated month names (e.g., "aug", "sep", "oct", etc.) in the URLs, which means I need to redirect from the old-style URLs to the new. This snippet is the solution I hit upon. Two things are notable here:

  1. Each one of these views uses reverse(), called with the appropriate arguments, to generate the URL to redirect to. This means URLs don't have to be hard-coded in.
  2. Each view takes an argument -- object_type -- which is used to generate the view name to pass to reverse, meaning that only one set of redirect views had to be written to handle both entries and links.

This is just one of many handy tricks reverse can do :)

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from django.core.urlresolvers import reverse
from django.http import HttpResponsePermanentRedirect


MONTH_DICT = { '01': 'jan',
               '02': 'feb',
               '03': 'mar',
               '04': 'apr',
               '05': 'may',
               '06': 'jun',
               '07': 'jul',
               '08': 'aug',
               '09': 'sep',
               '10': 'oct',
               '11': 'nov',
               '12': 'dec' }


def redirect_detail(request, year, month, day, slug, object_type):
    return HttpResponsePermanentRedirect(reverse('coltrane_%s_detail' % object_type,
                                                 kwargs={ 'year': year,
                                                          'month': MONTH_DICT[month],
                                                          'day': day,
                                                          'slug': slug }))


def redirect_archive_day(request, year, month, day, object_type):
    return HttpResponsePermanentRedirect(reverse('coltrane_%s_archive_day' % object_type,
                                                 kwargs={ 'year': year,
                                                          'month': MONTH_DICT[month],
                                                          'day': day }))


def redirect_archive_month(request, year, month, object_type):
    return HttpResponsePermanentRedirect(reverse('coltrane_%s_archive_month' % object_type,
                                                 kwargs={ 'year': year,
                                                          'month': MONTH_DICT[month] }))

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Comments

mbi (on August 25, 2007):

I'd probably use HttpResponsePermanentRedirect instead of HttpResponseRedirect, if the new URLs are going to stick!

#

ubernostrum (on August 25, 2007):

Good catch.

#

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