Hide shipping methods for specific shipping class in WooCommerce

Question

Essentially I\'m trying to make the flat rate method Id flat_rate:7 disabled when there is cart items that have the shipping class \"Roller\" (

Answer 1

By tweaking LoicTheAztec's code (cheers), I was able to unset a shipping method for each package based on the shipping class of its contents, rather than the cart as a whole. Perhaps it will help someone else too:

// UNSET A SHIPPING METHOD FOR PACKAGE BASED ON THE SHIPPING CLASS(es) OF ITS CONTENTS
add_filter( 'woocommerce_package_rates', 'hide_shipping_method_based_on_shipping_class', 10, 2 );
function hide_shipping_method_based_on_shipping_class( $rates, $package )
{
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    foreach( $package['contents'] as $package_item ){ // Look at the shipping class of each item in package

        $product_id = $package_item['product_id']; // Grab product_id
        $_product   = wc_get_product( $product_id ); // Get product info using that id

        if( $_product->get_shipping_class_id() != 371 ){ // If we DON'T find this shipping class ID
            unset($rates['wbs:9:dae98e94_free_ups_ground']); // Then remove this shipping method
            break; // Stop the loop, since we've already removed the shipping method from this package
        }
    }
    return $rates;
}

This code allows me to unset my 'Free UPS Ground' shipping if the package contains anything but 'Standard' items (shipping_class_id 371 in my case).

The scenario from the original post (disable method x if shipping class y) would work like this:

// UNSET A SHIPPING METHOD FOR PACKAGE BASED ON THE SHIPPING CLASS(es) OF ITS CONTENTS
add_filter( 'woocommerce_package_rates', 'hide_shipping_method_based_on_shipping_class', 10, 2 );
function hide_shipping_method_based_on_shipping_class( $rates, $package )
{
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    foreach( $package['contents'] as $package_item ){ // Look at the shipping class of each item in package

        $product_id = $package_item['product_id']; // Grab product_id
        $_product   = wc_get_product( $product_id ); // Get product info using that id

        if( $_product->get_shipping_class_id() == 92 ){ // If we DO find this shipping class ID
            unset($rates['flat_rate:7']); // Then remove this shipping method
            break; // Stop the loop, since we've already removed the shipping method from this package
        }
    }
    return $rates;
}