[Deprecated] DMZ 1.5.3 (DataMapper OverZealous Edition)

[eluser]OverZealous[/eluser]
[quote author="rayray" date="1248809433"]In DataMapper is it possible to achieve the same results without changing the DB schema?[/quote]

That is a usual layout. Please see the advanced relationships section of the DMZ manual. DMZ has specific requirements for the table and column names, so you will almost certainly have to rename and/or migrate your data.

You can, however, store $has_one relationships on the save table as the 'parent' object, using in-table foreign keys.