CodeIgniter returns "Undefined property: Rubrica::$usuario_model" trying to load function model

Question

I am working with CodeIgniter. In my "instancia" controller I need to create an instance from the controller "rubrica" to access a function from this.

instancia.php:

include_once APPPATH.'controllers/controller_ppal.php';
include_once(APPPATH.'controllers/rubrica.php');

class Instancia extends Controller_Ppal
{
    function __construct()
    {
        parent::__construct();
        $this->no_logged_msg = 'Debe estar autenticado en el sistema para acceder a esta opción.';
        $this->no_auth_msg = 'No tiene autorización para acceder aquí.';
        $this->no_partic = 'No ha agregado participantes a la lista aún.';
        $this->datos_inc = 'No ha ingresado todos los datos de al menos uno de los participantes.';

        $this->load->model('instancia_model');
        $this->load->model('usuario_model');
    }

    ...

    function guardar()
    {
        $ext_class = new Rubrica();
        $ext_class->session = $this->session;
        $ext_class->load->model('usuario_model'); //In spite of it is loaded in "__construct" function
        $id_rubrica = $ext_class->guardar();
    }
}

rubrica.php:

include_once APPPATH.'controllers/controller_ppal.php';

class Rubrica extends Controller_Ppal {

    function __construct()
    {
        parent::__construct();

        $this->no_logged_msg = 'Debe estar autenticado en el sistema para acceder a esta opción.';
        $this->no_auth_msg = 'No tiene autorización para acceder aquí.';
        $this->load->model('rubrica_model');
        $this->load->model('tag_model');
        $this->load->model('usuario_model');
    }

    function guardar()
    {
        $_POST['usuarios'] = $this->usuario_model->todos_usuarios($this->session->userdata('id_usuario'));
    }
}

I get the error message "Undefined property: Rubrica::$usuario_model". I have read several posts and I can't get the solution. Could someone help me?

Answer 1

If you have functions which needs to be shared between multiple controllers, you should write a library.

In application/libraries create Tools.php (or whatever you want)

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Tools
{
  protected $ci;

    public function __construct()
    {
        $this->ci =& get_instance();
    }

    public function myfunction($data)
    {
       //If you want to use codeigniter's functionalities :
       //use $this->ci->function()
    }

}

And then in your controllers :

$this->load->library("tools");
$this->tools->myfunction($data);

If your library is meant to be used very often, you can load it once for all in config/autoload.php :

$autoload['libraries'] = array('database', 'tools', '...');