Using session data within a model

Since you have the $session object in your controller you could also pass it to the model when the model is constructed.

Passing objects to a class constructor as a way of supplying the object's dependencies is a very good habit to have. It's actually considered a best practice, especially if you're going to do unit testing of a class - and you really, really should unit test. Then passing dependencies to an object is pretty much a must.

So, one approach is to define a model like this.

PHP Code:

<?php namespace App\Models;

use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Session\SessionInterface;

class UserModel
{
    protected $db;
    protected $session;

    public function __construct(ConnectionInterface &$db, SessionInterface &$session)
    {
        $this->db =& $db;
        $this->session =& $session; 
    }
} 


Use the model like this in a controller

PHP Code:

// other controller code

$session = Services::session();
$db = \Config\Database::connect();

$users = new UserModel($db, $session);

// other code 


If your model is extending /CodeIgniter/Model then there are a few minor changes, but I bet you get the idea.