Woocommerce: Dynamically change attributes / parameters of a WC Render-Block - php

Question

I use the Woocommerce “Handpicked products” Block in Wordpress Gutenberg to create a showcase of 3 products on my Frontpage. I saw that Woocommerce does not use Shortcodes for that, but that the page itself includes a paragraph which looks like this:
<!-- wp:woocommerce/handpicked-products {"contentVisibility":{"image":true,"title":true,"price":false,"rating":false,"button":false},"orderby":"menu_order","products":[181,225,179]} /-->"
I want to dynamically change the products (randomly shuffle) upon page load. Unfortunately, in the whole PHP-classes HandpickedProducts, AbstractProductGrid, AbstractDynamicBlock etc I do not see a Hook to change the Render parameter dynamically...
So what I found as possible solution is: To directly replace the product attribute in the Wordpress Post itself, therefore I implemented this hook:
function my_the_post_action(&$pobj) {
$pobj->post_content = str_replace('[181,225,179]', '[225, 220, 222]', $pobj->post_content );
}
add_action('the_post', 'my_the_post_action' );
It is actually replaced in the wp:woocommerce/handpicked-products paragraph, but doesnt take effect. Why does Woocommerce not consider the new Product IDs as parameters to his rendered block?
Thanks!!

Answer 1

Instead of modifying the "Blocks" entered via Pageeditor upon Pageload within the Frontpage - I came up with a better and cleaner option IMHO - by simply rendering such a Block within a customer Shortcode.
The following code consists of first the part where I randomly pick 3 products from the Database which have the Product-Tag "Featured" set so that the user can decide himself which products are open for selection ... and then I create my "Handpicked Products" block and render it:
add_shortcode('my_featured_prods', function($atts, $content = null)
{
// Get list of all Woocommerce products by Tag
$args = array(
'post_type' => 'product',
'posts_per_page' => 3,
'orderby' => 'rand',
'tax_query' => array(
array(
'taxonomy' => 'product_tag',
'field' => 'slug',
'terms' => 'featured'
)
)
);
$products = new WP_Query($args);
$ids = [$fix];
foreach($products->posts as $p)
$ids[] = $p->ID;
// Shuffle array:
shuffle($ids);
// Output Hand Picked Products Widget with my settings ...
$args = (object) [
'editMode' => 0,
'contentVisibility' => (object) [
'image' => 1,
'title' => 1,
'price' => 0,
'rating' => 0,
'button' => 0,
],
'orderby' => 'random',
'products' => $ids,
'alignButtons' => 1,
];
$args = sprintf(
'<!-- wp:woocommerce/handpicked-products %s /-->',
json_encode( $args )
);
return do_blocks($args);
});