Re: a tree with some dependencies

I would suggest that you write a special model method for this task, because the {before|after}Save callbacks can loop quite easily, which can cause high blood pressure.

Also helpful, if you use the MPTT, you can get ALL the children as a non-threaded result by using the LEFT and RIGHT fields. Also, if you fiddle too much with the parent-child and left/right values, make sure to rebuild the tree structure every now and then.

Here's some imagined code I wrote just now... It's not tested or anything, but should point you in the right direction.

class MyModel extends AppModel {

public function saveAndUpdateRelatedModel($data) {

    if (empty($data[$this->alias]['other_model_id']) && !empty($data[$this->alias]['parent_id'])){
         // the related model is not set AND has parent
         $this->recursive = -1;
         $parentRecord = $this->read(null, $data[$this->alias]['parent_id']);
         if (!empty($parentRecord[$this->alias]['other_model_id'])){

             // copy the other_model_id from the parent

             $data[$this->alias]['other_model_id'] = $parentRecord[$this->alias]['other_model_id'];

         }

    }
    //save the record with other model relation
    $saved = $this->save($data);
    //now pass it on to children
    $children = $this->find('all', array(

       // I have not idea if this is done right, check the docs and test...

       'conditions' => array( 

             'left >' => $saved[$this->alias]['left'], 

             'right <' => $saved[$this->alias]['right']

       ),

       'recursive' => -1

    ));

    foreach($children as $child){

       $child[$this->alias]['other_model_id'] = $saved[$this->alias]['other_model_id'];

       if (!$this->save($child)){

          trigger_error("FAILED", E_USER_ERROR);

       }

    }

}

}

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