Function get_list() for codeigniter v2

I'm new into CodeIgniter so I have more questions about it. In my controller I have this:

public function __construct() {
       parent::__construct();
       $this->load->model('db/m_class_model', 'class');
       $this->load->model('db/m_course_model', 'course');
       $this->load->library('form_validation');
       $this->load->library("pagination");
       $this->load->library('user_agent');
       $this->load->model('db/m_item_model', 'm_item_model');
   }

public function index() {
       if ($this->error_flg)
           return;
       try {

           $pagin['total_rows'] = count($this->class->get_list());

       } catch (Exception $e) {
           $this->_show_error($e->getMessage(), $e->getTraceAsString());
       }
   }

My question is I can't find this function "get_list()" inside the model "m_class_model". Is this a built-in function of CodeIgniter? because I've search inside its documentation and I can't find that function. Enlighten me about this one. Any help will do.

Attached Files

Thumbnail(s)