Exclude products with specific attributes terms from WooCommerce coupons

Question

I would like to exclude from all WooCommerce coupons the products that have a specific attribute (e.g. attribute_pa_brand => mybrand).

I followed this answer Exclude variations with 2 specific attribute terms from coupon usage in Woocommerce but it seems to apply only to the Variable Product type, while I would only need it for the Simple Product.

I will be grateful for any answer.

Answer 1

The linked code from your question is for product variation type. Now to make it work for simple products and variable products (without targeting specific variations attributes terms), you will use the following:

add_filter( 'woocommerce_coupon_is_valid', 'custom_coupon_validity', 10, 3 );
function custom_coupon_validity( $is_valid, $coupon, $discount ){
    // YOUR ATTRIBUTE SETTINGS BELOW:
    $taxonomy   = 'pa_brand'; // Set the taxonomy (start always with "pa_" + the slug)
    $term_names = array('Apple', 'Sony'); // Set your term NAMES to be excluded

    $term_ids = array(); // Initializing

    // Convert term names to term Ids
    foreach ( $term_names as $term_name ) {
        // Set each term id in the array
        $term_ids[] = get_term_by( 'name', $term_name, $taxonomy )->term_id;
    }

    // Loop through cart items and check for backordered items
    foreach ( WC()->cart->get_cart() as $cart_item ) {
        $product = $cart_item['variation_id'] > 0 ? wc_get_product($cart_item['product_id']) : $cart_item['data'];
        // Loop through product attributes
        foreach( $product->get_attributes() as $attribute => $values ) {
            if( $attribute === $taxonomy && array_intersect( $values->get_options(), $term_ids ) ) {
                $is_valid = false; // attribute found, coupons are not valid
                break; // Stop and exit from the loop
            }
        }
    }
    return $is_valid;
}

Code goes in functions.php file of the active child theme (or active theme). Tested and works for simple and variable products on last WooCommerce version.