Mark, I'm trying to test run your above example with SQLAlchemy-ORM-tree-0.1.2 and SQLAlchemy-0.8.0b2
i get the following traceback, any suggestions, thanks Traceback (most recent call last): File "./t.py", line 28, in <module> Node.tree.register() File "/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/manager/unmapped.py", line 216, in __get__ return self._get_class_manager(root_node_class) File "/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/manager/unmapped.py", line 250, in _get_class_manager manager = self.class_manager) File "/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/options.py", line 233, in class_mapped self.parent_field_name = self._get_parent_field_name() File "/nfs/disks/rel/SQLAlchemy-ORM-tree-0.1.2/sqlalchemy_tree/options.py", line 260, in _get_parent_field_name u"could not auto-detect parent field name; tree extension will not " \ ValueError: could not auto-detect parent field name; tree extension will not work property without a parent relationship defined -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/dSwo2N8kxjIJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.