public function __construct()
{
    global $conf, $langs;

    $langs->load("products");

    // Ajouter les extrafields depuis la configuration
    $extrafields = getDolGlobalString('MYMODULE_PRODUCT_EXTRAFIELDS');

    if (!empty($extrafields)) {
        foreach (explode(',', $extrafields) as $field) {
            $key = "options_" . trim($field);
            $this->listOfPublishedFields[$key] = trim($field);
        }
    }

    $this->boot();
}