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))
Adds a property to the target of a reference field that
    returns the list of associated objects.