I've tried to find something similar in the SA 0.3 docs but haven't managed yet. They are dense though so I could easily have missed something. Apologies if this seems a simple problem! :/
I have a product table, some are allowed to be collections ( ie gift basket. ) They will have children, which are in turn products. I put in a boolean attribute so I can control whether they are collections, and I only need one layer deep, so products can be collections or children, and not both. Each product can be the child of many collections. I was hoping I could handle this by having a many to many table of parent products to children so I could do: collection.children Below is what I have tried and failed with: # many to many of collection-products to products collections_products_table = Table('collections_products', metadata, Column('collection_id', Integer, ForeignKey('products.id') ), Column('product_id', Integer, ForeignKey('products.id') ), ) #mapper assign_mapper(session.context, Product, product_table, properties={ 'children': relation( Product, secondary=collections_products_table, lazy=True, ) }) or assign_mapper(session.context, Product, product_table, properties={ 'children': relation( Product, secondary=collections_products_table, primaryjoin = collections_products_table.c.collection_id==product_table.c.id, lazy=True ), }) Neither of the above work. Tg loads ok but when I try to make a product I get the following: ArgumentError: Error determining primary and/or secondary join for relationship 'children' between mappers 'Mapper|Product|products' and 'Mapper|Product|products'. If the underlying error cannot be corrected, you should specify the 'primaryjoin' (and 'secondaryjoin', if there is an association table present) keyword arguments to the relation() function (or for backrefs, by specifying the backref using the backref() function with keyword arguments) to explicitly specify the join conditions. Nested error is "Cant determine join between 'products' and 'collections_products'; tables have more than one foreign key constraint relationship between them. Please specify the 'onclause' of this join explicitly." I'm in over my head here, so if anyone has the time to comment on the above that would be luverly. Thanks Iain --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---