Cart rule with proportional gift products

[Guillaume_KS]

Hello,

I would like to create a cart rule with a free gift product for every 10 products purchased:

for example if you buy 10 products X, you receive 1 additional product X. This is managed natively by the cart rule. What I would like to do is that from 20 products X, you don't receive 1 product X, but 2 products X, 3 from 30 etc...

Do you know how this can be managed ?

Here is a part of my current code that manages the addition of a cart rule

 

        $cartRule = new CartRule();

        if($id_customer) {
            $cartRule->id_customer = $id_customer;
        }

        $cartRule->name = array($this->langId => "test_promoX+Y");
        $cartRule->date_from = $date_formated;
        $cartRule->date_to = "2050-01-01";
        $cartRule->active = true;
        if($id_group) {
            $cartRule->group_restriction = true;
        }
        $cartRule->product_restriction = true;

        if($id_product) {
            $cartRule->gift_product = $id_product;
        }


        $cartRule->save();

        $id_cart_rule = $cartRule->id;

        if($id_group > 0)
        {
            $groupRestriction = \Db::getInstance()->getValue(
                "INSERT INTO
                "._DB_PREFIX_."cart_rule_group
                (id_cart_rule, id_group)
                VALUES ($id_cart_rule, $id_group)
                " );
        }
        if($id_product > 0)
        {
            $type = 1;

            Db::getInstance()->execute(
                "INSERT INTO " . _DB_PREFIX_ . "cart_rule_product_rule_group
                 (id_cart_rule, quantity)
				VALUES ($id_cart_rule, 1)");
            $id_product_rule_group = \Db::getInstance()->Insert_ID();

            Db::getInstance()->execute(
                "INSERT INTO " . _DB_PREFIX_ . "cart_rule_product_rule
                    (id_product_rule_group, type)
                    VALUES ($id_product_rule_group, $type)");
            $id_product_rule = Db::getInstance()->Insert_ID();

            Db::getInstance()->execute(
                "INSERT INTO " . _DB_PREFIX_ . "cart_rule_product_rule_value
                    (id_product_rule, id_item)
                    VALUES ($id_product_rule, $id_product)");

        }
        return true;
    }

Thank you for your time !

[Nickz]

I wonder why people don't use the opportunity to establish a sales funnel on the basis of a special perk?

 Client buys the first product and receives an email with welcome, thank you note and the tip that each 10th buy he receives an extra gift.