I would like to set up a table prefix for all my models, How can set config.php

Regarding my configuration prefix; how to use it?

I would like to set up a table prefix for all my models, since this is how it is designed in the database.

• How can I achieve that?
• How can set it in config.php
• How can I use in Model

class Users extends Phalcon\Mvc\Model
{
    public function getSource()
    {
        //return 'ik_' . 'users';
        return $this->get('config')->database->prefix.'users';
    }
}

//config.php    'prefix'   => 'ik_'
//////////////////////////////////////////////////////
return new \Phalcon\Config(
    'database' => array(
        'adapter'  => 'mysql',
        'host'     => 'localhost',
         'username' => 'root',
        'password' => '',
        'name'     => 'ikphp',
        'prefix'   => 'ik_', // table prefix
),
));