code: def get_url(self, action, obj=None, domain=True):
          
          if not obj:
              url = reverse('actstream_detail', None, (action.pk,))
          elif hasattr(obj, 'get_absolute_url'):
              url = obj.get_absolute_url()
          else:
              ctype = ContentType.objects.get_for_model(obj)
              url = reverse('actstream_actor', None, (ctype.pk, obj.pk))
          if domain:
              return add_domain(Site.objects.get_current().domain, url)
          return url
docs: Returns an RFC3987 IRI for a HTML representation of the given object, action.
          If domain is true, the current site's domain will be added.