Model with self association: how do I reference associated field from Child?

Thank you, so much, for taking the time to help. I do appreciate how quickly individuals here has shared their expertise.

I have a model, called "Topic", with a hasOne association to another model, called "Passage." In the Passage model is a field that I always need when calling up Topic data: this field is called "ref_abbr." I can get a view of "Topic" that includes this "Passage" field just fine, e.g.: $topic['Passage']['ref_abbr']

Now, here's the question: The "Topic" model also has a self association setup with $belongsTo ParentTopic and $hasMany ChildTopic. So, when I get a view of "Topic" it also shows its children listed at the bottom of the page. That works great, but I want that Passage ref_abbr field included in this list as well. So, how do I get a view of ChildTopic that also includes this Passage field, e.g. something like: $childTopic['ref_abbr'] -- but that does not actually work.

Is there more I need to do in setting up the association in the Topic model? Right now I have:

public $hasOne = array(

'Passage' => array(

'className' => 'Passage',

'foreignKey' => 'topic_id' ) );

public $belongsTo = array(

'ParentTopic' => array(

'className' => 'Topic',

'foreignKey' => 'parent_id' )  );

public $hasMany = array(

'ChildTopic' => array(

'className' => 'Topic',

'foreignKey' => 'parent_id',

'dependent' => false )  );

Do I need to manually specify a join for ChildTopic to the Passage model?

Thank you!

Kevin

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