WooCommerce custom shipping rate with cost at product level - php

Question

I want to create several shipping rates in WooCommerce, based on a different fixed cost per product, which I'm saving as meta values. I'd like to offer a different selection of rates for each of my shipping zones: for example, in the UK I'd like to have UK First and UK Second, each of which has a different cost for each product.
I've created the first of my shipping methods, and I can add it to a shipping zone. But when I try to check out in that zone, the cart says No shipping options were found. Can anyone spot what I'm doing wrong?
I've turned on debug mode and confirmed that I really am checking out in the UK zone.
I've also tried just adding the rate and returning from the top of calculate_shipping:
$this->add_rate(
$rate = array(
'id' => $this->id,
'label' => $this->title,
'cost' => 101,
)
);
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
function shipping_method_uk_first_init() {
class Shipping_Method_UK_First extends \WC_Shipping_Method {
private string $meta_key = 'shipping_uk_1st';
public function __construct() {
$this->id = 'shipping_method_uk_first';
$this->method_title = __( 'UK First' );
$this->method_description = __( 'Royal Mail first class' );
$this->enabled = 'yes';
$this->title = 'UK First Class';
$this->supports = array(
'shipping-zones',
'instance-settings',
);
$this->init();
}
function init() {
$this->init_form_fields();
$this->init_settings();
add_action(
'woocommerce_update_options_shipping_' . $this->id,
array(
$this,
'process_admin_options',
)
);
}
public function calculate_shipping( $package = array() ) {
$cost = 0;
foreach ( $package['contents'] as $item_id => $values ) {
$product = $values['data'];
$product_shipping_method_cost = $product->get_meta( $this->meta_key );
$cost += floatval( $product_shipping_method_cost );
}
$rate = array(
'id' => $this->id,
'label' => $this->title,
'cost' => $cost,
);
$this->add_rate( $rate );
}
}
}
add_action( 'woocommerce_shipping_init', 'shipping_method_uk_first_init' );
function add_shipping_method_uk_first( $methods ) {
$methods['shipping_method_uk_first'] = 'Shipping_Method_UK_First';
return $methods;
}
add_filter( 'woocommerce_shipping_methods', 'add_shipping_method_uk_first' );
}

Answer 1

There are some mistakes and missing things. I have also added a product custom field to product shipping options. Try the following:
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
function shipping_method_uk_first_init() {
class Shipping_Method_UK_First extends \WC_Shipping_Method {
public function __construct( $instance_id = 0 ) {
$this->id = 'shipping_method_uk_first';
$this->instance_id = absint( $instance_id );
$this->method_title = __( 'UK First' );
$this->method_description = __( 'Royal Mail first class' );
$this->enabled = 'yes';
$this->meta_key = 'shipping_uk_1st'; // <= HERE define the related product meta key
$this->title = __('UK First Class' );
$this->supports = array(
'shipping-zones',
'instance-settings',
);
$this->init();
}
function init() {
$this->init_form_fields();
$this->init_settings();
add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
}
public function calculate_shipping( $package = array() ) {
$cost = 0; // Initializing
foreach ( $package['contents'] as $item_key => $item ) {
// Get the parent variable product for product variation items
$product = $item['variation_id'] > 0 ? wc_get_product( $item['product_id']) : $item['data'];
$cost += floatval( $product->get_meta( $this->meta_key ) );
}
$rate = array(
'id' => $this->id,
'label' => $this->title,
'cost' => $cost,
);
$this->add_rate( $rate );
}
}
}
add_action( 'woocommerce_shipping_init', 'shipping_method_uk_first_init' );
function add_shipping_method_uk_first( $methods ) {
$methods['shipping_method_uk_first'] = 'Shipping_Method_UK_First';
return $methods;
}
add_filter( 'woocommerce_shipping_methods', 'add_shipping_method_uk_first' );
// Add a custom field to product shipping options
function add_custom_field_product_options_shipping() {
global $product_object;
echo '</div><div class="options_group">'; // New option group
woocommerce_wp_text_input( array(
'id' => 'shipping_uk_1st',
'label' => __( 'UK First shipping cost', 'woocommerce' ),
'placeholder' => '',
'desc_tip' => 'true',
'description' => __( 'Enter the UK First shipping cost value here.', 'woocommerce' ),
'value' => (float) $product_object->get_meta( 'shipping_uk_1st' ),
) );
}
// Save product custom field shipping option value
function save_custom_field_product_options_shipping( $product ) {
if ( isset($_POST['shipping_uk_1st']) ) {
$product->update_meta_data( 'shipping_uk_1st', (float) sanitize_text_field($_POST['shipping_uk_1st']) );
}
}
add_action( 'woocommerce_product_options_shipping', 'add_custom_field_product_options_shipping', 5 );
add_action( 'woocommerce_admin_process_product_object', 'save_custom_field_product_options_shipping' );
}
Code goes in functions.php file of the active child theme (or active theme). Tested and works.