Controller - Model in CodeIgniter and "Undefined property" - php

Question

<?php
class Success_model extends CI_Model
{
function __construct()
{
// Call the Model constructor
parent::__construct();
}
//insert into user table
function get_all()
{
$query = $this->db->get('session'); // = select * from session
return $query->result();
}
}
<?php
class Success extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->library('session');
$this->load->helper('url');
$this->load->model('success_model');
}
public function index()
{
$data= $this->Success_model->get_all();
$this->load->view('success_view', $data);
}
}
?>
As You can see this is good, but I have error:
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Success::$Success_model
Filename: controllers/success.php
Line Number: 15
Backtrace:
File: C:\xampp\htdocs\session\application\controllers\success.php
Line: 15
Function: _error_handler
File: C:\xampp\htdocs\session\index.php
Line: 292
Function: require_once
Fatal error: Call to a member function get_all() on null in C:\xampp\htdocs\session\application\controllers\success.php on line 15
A PHP Error was encountered
Severity: Error
Message: Call to a member function get_all() on null
Filename: controllers/success.php
Line Number: 15
Backtrace:
I'm looking, and looking, but I dont know what is bad. The good directories are files, other classes are working but this not.
Please help. I'm just tired, because after 2 hours searching mistakes...

Answer 1

For CI v3, afaik
I think I see it:
$data= $this->Success_model->get_all();
Should be:
$data = $this->success_model->get_all(); // Notice the lowercase success_model
PHP variables are case-sensitive where as functions and class names are not.
One more solution would be to change
$this->load->model('success_model');
into
$this->load->model('Success_model');
because then you can use
$data= $this->Success_model->get_all();