models.py 文件源码

def get_family(self):
        """
        Returns a ``QuerySet`` containing the ancestors, the model itself
        and the descendants, in tree order.
        """
        opts = self._mptt_meta

        left = getattr(self, opts.left_attr)
        right = getattr(self, opts.right_attr)

        ancestors = Q(**{
            "%s__lte" % opts.left_attr: left,
            "%s__gte" % opts.right_attr: right,
            opts.tree_id_attr: self._mpttfield('tree_id'),
        })

        descendants = Q(**{
            "%s__gte" % opts.left_attr: left,
            "%s__lte" % opts.left_attr: right,
            opts.tree_id_attr: self._mpttfield('tree_id'),
        })

        return self._tree_manager.filter(ancestors | descendants)