> you need to flip around where you put the "delete-orphan" rule - see my
> previous email on the subject.
>



In other words:
order_mapper = mapper(Order, order_table, properties=dict
(orderdetails=relation(OrderDetail,
                                cascade='all,delete-orphan', single_parent=True,
                                backref='parentorder')))
orderdetail_mapper = mapper(OrderDetail, order_detail_table)

=====

Thank you very much.

That also solved the earlier problem with merge.  I don't need to
supply both portions of the composite key... it works that out.


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