'Returns the admin URL to edit the object represented by this log entry.
This is relative to the Django admin index page.'

def get_admin_url(self):

    if (self.content_type and self.object_id):
        url_name = (u'admin:%s_%s_change' % (self.content_type.app_label, self.content_type.model))
        try:
            return reverse(url_name, args=(quote(self.object_id),))
        except NoReverseMatch:
            pass
    return None
