What I have is a product class, you can get a product via its id or its product nr. So I have created 2 constructors. The class is retrieving the product via the database and mapping the result to the class variables.
class Partnumber extends CI_Model
{
private $partNr;
private $description;
private $type;
public function __construct() {
}
public static function withId( $id ) {
$instance = new self();
$instance->loadByID( $id );
return $instance;
}
public static function withNr($partnumber) {
$instance = new self();
$instance->getIdFromPartnumber($partnumber);
return $instance;
}
protected function loadByID( $id ) {
$instance = new self();
$instance->getPartnumberFromId($id);
return $instance;
}
private function getIdFromPartnumber($partnumber){
$this->db->select("*");
$this->db->from('part_list');
$this->db->where('part_number', $partnumber);
$query = $this->db->get();
return $query->result_object();
}
//get the partnumber from an part id
private function getPartnumberFromId($partId){
$this->db->select("*");
$this->db->from('part_list');
$this->db->where('id', $partId);
$query = $this->db->get();
$this->mapToObject($query->result());
}
private function mapToObject($result){
$this->partNr = $result[0]->Part_number;
$this->description = $result[0]->Description;
$this->type = $result[0]->Type;
}
public function toJson(){
return json_encode($this->partNr);
}
}
The mapping works, (I know, I have to catch the errors). But all the values are null when I calling the toJson method.
I call it like this:
class TestController extends MX_Controller{
public function __construct(){
parent::__construct();
$this->load->model('Partnumber');
}
public function loadPage() {
$p = Partnumber::withId(1);
echo $p->toJson();
}
}
And yes, I know for sure that data is coming back, because I can print all the items in the mapping method. But why is the data gone when I acces it via toJson?
