Extending CI_MODEL but nothing....

[eluser]andreffonseca[/eluser]
Hi to all,

I got some kind of a problem in my code and i can't fix it.
It goes like this:

I create a model

Code:

class Fieldvalidation extends CI_Model{

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

    /**
     *
     * @param array $_params
     * @return array
     */
    private function _validateFormFields($_params)
    {
        
        $r = $this->db->query("select * from users");
        print_r($r);
        
        exit(0);
        
    }
}

The problem is when i run this code it gives me a

Fatal error: Call to a member function query() on a non-object in (...)

but if i done this:

Code:

$CI = & get_instance();
        $r = $CI->db->query("select * from users");
        print_r($r);

everything works like a charm...

I must always use "get_instance()" to use loaded libraries? The extends isn't enought?

Using CI 2.1.3.

Thanks in Advance