gfk.py 文件源码

def __set__(self, instance, value):
        mtv = instance._meta.db_table
        miv = instance._get_pk_value()
        if (isinstance(value, SelectQuery) and
                value.model_class == self.model_class):
            UpdateQuery(self.model_class, {
                self.model_type_field: mtv,
                self.model_id_field: miv,
            }).where(value._where).execute()
        elif all(map(lambda i: isinstance(i, self.model_class), value)):
            for obj in value:
                setattr(obj, self.model_type_field.name, mtv)
                setattr(obj, self.model_id_field.name, miv)
                obj.save()
        else:
            raise ValueError('ReverseGFK field unable to handle "%s"' % value)