Changing cart data during Ajax woocommerce - cookies

Question

I'm trying to replace the current WooCommerce cart with a saved one, during Ajax.
This is the code i'm using:
function restore()
{
$current_user_id = get_current_user_id();
if ($current_user_id > 0) {
if (function_exists('get_user_attribute')) {
$buy_now_persistent_cart = get_user_meta($current_user_id, '_buy_now_persistent_cart', true);
error_log(print_r($buy_now_persistent_cart, 1));
if (!empty($buy_now_persistent_cart['cart'])) {
WC()->session->cart = $buy_now_persistent_cart['cart'];
WC()->session->applied_coupons = $buy_now_persistent_cart['applied_coupons'];
if (function_exists('delete_user_attribute')) {
//delete_user_attribute( $current_user_id, '_buy_now_persistent_cart' );
}
//delete_user_meta( $current_user_id, '_buy_now_persistent_cart' );
}
}
}
This is the $buy_now_persistent_cart output:
Array
(
[cart] => Array
(
[3430dcf4efe8aa0c418434656773a73a] => Array
(
[key] => 3430dcf4efe8aa0c418434656773a73a
[product_id] => 126096
[variation_id] => 0
[variation] => Array
(
)
[quantity] => 1
[data_hash] => b5c1d5ca8bae6d4896cf1807cdf763f0
[line_tax_data] => Array
(
[subtotal] => Array
(
)
[total] => Array
(
)
)
[line_subtotal] => 2.4
[line_subtotal_tax] => 0
[line_total] => 2.4
[line_tax] => 0
)
)
[applied_coupons] => Array
(
)
)
When I output WC()->session->cart after setting the new data it seems to have changed correctly, but the updated cart is not there when the Ajax finishes.
I guess it is about saving the cart and/or setting a cart hash and cookies?
I just can't figure it out.
Any help will be appreciated.

Answer 1

I would approach it in a different way. First empty the user cart, then add all the products.
Something like:
if (!empty($buy_now_persistent_cart['cart'])) {
WC()->cart->empty_cart();
foreach($buy_now_persistent_cart['cart'] as $item){
WC()->cart->add_to_cart($item['product_id'], $item['quantity']);
}
}
I didn't tested it, but in general I think it's a better approach than forcing a session