Opencart 1.5.4 - 不验证同一产品的不同选项的最小订单数量

Question

For my Opencart 1.5.4 project, we have set the minimum 12 quantity for product. If the user select the quantity less than 12 it will not allow user to buy it (Opencart validate this on cart page). But if user selects the same product in the group of different option (small, medium, large) individual less than 12 then he can place the order.

For e.g.

Product A (small) 6 Qty

Product A (medium) 6 Qty

Product A (large) 10 Qty

Total quantity is 22.

But I want individual item quantity is minimum 12 like below,

Product A (small) 12 Qty (minimum 12)

Product A (medium) 12 Qty (minimum 12)

Product A (large) 12 Qty (minimum 12)

Opencart is not treated different options as different product in cart and user can easily buy individual product in less than 12 quantity.

Can any one suggest me why this happen and how to fix this issue? Any extension is available for that?

Answer 1

I have found the solution of this issue, for that I have to make changes in the cart and checkout controller. By default Opencart is calculating the product quantity on the cart page by product id. I have customized the code and now it will check the individual quantity of each product in the cart.

Cart controller ==> Cart.php \catalog\controller\checkout\cart.php make changes in line no 192 to 197

foreach ($products as $product) {

    $product_total = 0;
    $allCartProductId[] = $product['product_id'];
    foreach ($products as $product_2) {
        if ($product_2['product_id'] == $product['product_id']) {
            $product_total += $product_2['quantity'];
        }
    }

    if ($product['minimum'] > $product_total) {
        $this->data['error_warning'] = sprintf($this->language->get('error_minimum'), $product['name'], $product['minimum']) 
    }
}

To

foreach ($products as $product) {

                $product_total = 0;
                $allCartProductId[] = $product['product_id'];

                        $product_total += $product['quantity'];

                if ($product['minimum'] > $product_total) {
                    $this->data['error_warning'] .= sprintf($this->language->get('error_minimum'), $product['name'], $product['minimum'])."<br>";
                }

Checkout controller ==> checkout.php \catalog\controller\checkout\checkout.php make changes in line no 15 to 20

foreach ($products as $product) {
        $product_total = 0;

        foreach ($products as $product_2) {
            if ($product_2['product_id'] == $product['product_id']) {
                $product_total += $product_2['quantity'];
            }
        }

To

foreach ($products as $product) {
    $product_total = 0;         
    $product_total += $product['quantity'];