controller
$this->AdAddress = TableRegistry::get('AdAddress');
$this->AdAddress->find('jeff',['limit' => 30]);
$this->AdAddress = TableRegistry::get('AdAddress');
$this->AdAddress->find('jack');

AdAddressTable.php
<?php
namespace App\Model\Table;

use Cake\ORM\Query;
use Cake\ORM\Table;

class AdAddressTable extends TableEx
{
	public function findJeff(Query $query, array $options)
	{
		return $query->group(['city_id'])->order(['id' => 'ASC'])->all();
	}
	public function findJack(Query $query, array $options)
	{
		return $this->find()->group(['city_id'])->order(['id' => 'ASC'])->limit(3);
	}
}