[Deprecated] DMZ 1.5.3 (DataMapper OverZealous Edition)

[eluser]OverZealous[/eluser]
Have you checked to make sure that $portfolio is loading correctly? (->exists())

You cannot have an id of '0' for objects. A zero id is the same as empty(), which means a non-existant object to DataMapper. Please use auto-generated values. If you need to have special, system-only rows, try either using a special boolean column that is a flag (ex: 'is_system'), or using negative ids (I use the latter).

Have you verified that relationships are set up correctly on both objects?

It is almost certainly something wrong on your end. You might want to look through this forum, because I've answered this exact problem at least twice, I believe, and maybe a few times on the original DataMapper forum.