Proper MVC location for a function and its call

Hello. Thank you, so very much, for you time and expertise. 

I am just getting started with PHP, MVC, and CakePHP. Having read through the documentation, I'm still confused about how, where to do things with proper MVC. I have a function for a TreeBehavior that returns the level of a node in the tree (1, 2, 3, etc.) based upon getPath() method.

/**

* getlevel

*

* @param int $id

* @return int

*/

public function getlevel($id=null) {

// Count of array items, minus one, will tell me the level of the node

$count = count($this->TopicTree->getPath($id,array('TopicTree.id')))-1;

// debugger::dump($count); die;

return $count;

}

The function works with debugger::dump($count); die;, producing a result, e.g.: (int) 4

Now, I would like to use that returned value in the controller's edit and add actions, to insert into the database this value in a "level" field.

I want to use proper MVC approach. So, where does this function reside (in the TopicTree Model?) and where do I call it (from the edit and add actions of the TopicTreesController?) ?

Maybe this is an entirely different issue, but would your answer change if I also wanted to use the function to, say, include the level in the Title of the index view?

So confused, but really do want to learn how to do this right!

Thank you!!

Kevin

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