I have a self referential hierarchy structure in a table that I have mapped with SA 0.4. What I would like to do is query the table given a node, and find its grandchildren based on some criteria in both the child and grandchildren nodes. In SQL I would do:
SELECT * FROM nodehierarchy AS grandparent JOIN nodehierarchy AS parent ON parent.parentuid = grandparent.uid JOIN nodehierarchy AS child ON child.parentuid = parent.uid WHERE grandparent.uid = <<some_value>> AND parent.type=<<different_value>> AND child.type=<<another_value>> ORDER BY parent.name, child.name; Following the third example from http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_relation_selfreferential_query I have the following: grandchildren = session.query(Node).filter(Node.c.type==var1).\ join('Parent', aliased=True).filter(Node.c.type==var2).\ join('Parent',aliased=True, from_joinpoint=True).filter(Node.uid==var3).all () # order_by(Node.Parent.name, Node.name).all() grandchildren.sort (key=lambda i: (i.Parent.name,i.name)) However the commented out order_by() doesn't work I get "AttributeError: 'InstrumentedAttribute' object has no attribute 'name'" As you can see I am currently sorting client side. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
