How to update price for Woocommerce variable product?

Question

WooCommerce

Hello,
I can't update prices for a variable product from my meta box
, I use the following code to update prices for a product and its variations

update_post_meta( $post->ID, '_regular_price', (float)$meta_value  );
update_post_meta( $post->ID, '_price', (float)$meta_value  );

But the old price is shown in the store and in the product card,

and the new price is already in the basket

Answer 1

Woocomerce actively uses transients. This is a temporary WordPress cache.
For your changes to take effect immediately, you need to delete the transient for this product

// очищаем кэш
  wc_delete_product_transients($product_id);

I also somehow searched and found it in the source code, somewhere very deep.
But to be honest, your approach is wrong, because. Woocommerce, when changing the price of a variation, also corrects the meta field of the product itself. And you work bypassing woo, directly with the database. Unfortunately, I won’t share the correct code, I didn’t get around to rewriting it, look it up on the net. I think we need to work with the WC_Product class and its derivatives.