docs: def _initialize_referenced(model_class, attribute):
      """Adds a property to the target of a reference field that
      returns the list of associated objects.
      """
      # this should be a descriptor
      def _related_objects(self):
          return (model_class.objects
                  .filter(**{attribute.attname: self.id}))
  
      klass = attribute._target_type
      if isinstance(klass, basestring):
          return (klass, model_class, attribute)
      else:
          related_name = (attribute.related_name or
                  model_class.__name__.lower() + '_set')
          setattr(klass, related_name,
                  property(_related_objects))