Set programmatically product sale price and cart i

Question

This is the continuation of : Set product sale price programmatically in WooCommerce 3

The answer works, however once a user adds the product to cart, the old price still shows up on checkout.

How to get the correct sale price on cart and checkout pages for cart items?

Any help is appreciated.

Answer 1

@LoicTheAztec answers works very nicely, but is not required.

You need to filter at least woocommerce_product_get_price and woocommerce_product_variation_get_price with the dynamic_sales_price_function.

To make it work really smoothly, you need some more filters as well.

Answer 2

The missing part to get it work for for cart and checkout pages (and also Orders and email notifications too) is a very simple trick:

add_action( 'woocommerce_before_calculate_totals', 'set_cart_item_sale_price', 20, 1 );
function set_cart_item_sale_price( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    // Iterate through each cart item
    foreach( $cart->get_cart() as $cart_item ) {
        $price = $cart_item['data']->get_sale_price(); // get sale price
        $cart_item['data']->set_price( $price ); // Set the sale price

    }
}

Code goes in function.php file of your active child theme (active theme).

Tested and works.

So the code just set the product sale price as the product price in cart items and it works.