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<?php

class Product extends ProductCore
{

public static function changeAccessoriesForProduct($accessories_id, $product_id)  {
        foreach ($accessories_id as $id_product_2) {
            Db::getInstance()->insert('accessory', array(
                'id_product_1' => (int)$product_id,
                'id_product_2' => (int)$id_product_2
            ));
            // next 3 lines added to mirror for both ways relation
            Db::getInstance()->insert('accessory', array(
                'id_product_1' => (int)$id_product_2,
                'id_product_2' => (int)$product_id,
            ));
            }
}

public function deleteAccessories()  {
        // the next line is commented by Vito
        // return Db::getInstance()->delete('accessory', 'id_product_1 = '.(int)$this->id);
        // next 3 lines added for removing of both relations
        $res = Db::getInstance()->delete('accessory', 'id_product_1 = '.(int)$this->id);
        $res &= Db::getInstance()->delete('accessory', 'id_product_2 = '.(int)$this->id);
        return $res;
 }

public function deleteFromAccessories()  {
        // the next line is commented by Vito
        // return Db::getInstance()->delete('accessory', 'id_product_2 = '.(int)$this->id);
        // next line is added for removing of both mirorred relations
        return $this->deleteAccessories();
 }    

I try to add this Code in /override/classes/ but i get an 500error with 1.7.6.2. The cache is empty. Anyone an idea?