DMZ 1.7.1 (DataMapper OverZealous Edition)

[eluser]OverZealous[/eluser]
@Mareshal
No. Write a custom method on the parent table's model, or override the save function on the parent table:

Code:

class Parent extends DataMapper {
    function save($object = '', $related_field = '') {
        $needs_update = ($this->shared_field === $this->stored->shared_field);
        $ret = parent::$save();
        if($need_update && $ret) {
            if($this->other_object->get()->exists()) {
                $this->other_object->shared_field = $this->shared_field;
                $this->other_object->save();
            }
            // repeat for each object
        }
        return $ret;
    }
}

You may need to add in special code to check for new objects. This is just an example, so don't take it as gospel.