cakephp Counter cache in nested model

i have nested model structure

id

parent_id

counter

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how to use automated counter cache

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Define it in the relationship definition.

<?php

class YourModel extends AppModel {

    var $belongsTo = array(
        'ParentModel' => array(
            'foreignKey' => 'your_model_id',
            'className' => 'ParentModel',
            'counterCache' => 'counter'
            )
        )
    );
}
?>

Where 'counter' is the field in your table that contains the count.