defining guid, permalink for feeds and site

In our website, for short urls we are using a different domain name.. 

So, get_absolute_url() in model methods uses django.core.urlresolvers.reserve() and thus returns the actual domain name

Till now we have been manually defining short urls in views like

permalink = settings.SPC['short_URL_root'] + str(submission.id) + '/' + \

                                                  str(revision.rev_id+1) + '/'

settings.SPC['short_url_root'] is short-url domain name

Since I feel this method inconsistent I would like to define a model method like below

from django.conf import settings

def permalink(self):

        return settings.SPC['short_URL_root'] + '/%d/%s' %(self.entry.pk, self.rev_id+1)

Would it be a nice idea..

The whole point of defining such a model method helps me returning "item_guid" in feed syndication. something like this:

def item_guid(self, item):

      return item.permalink()

Would it be a nice idea to define such a model method? 

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