somebehavior.php

<?php
// Calling this model OtherItem
// in your model initialize function for your OtherItem
$this->addBehavior('CounterCache', [
    'PrimaryItems' => [
        'other_items_count' 
    ]
]);

$this->hasMany('OtherItems', [
    'conditions' => [
        'OtherItems.someproperty = PrimaryItems.someproperty',
        'OtherItems.date < PrimaryItems.date',
    ]
]);