How to render a custom block with variables from another custom block twig template

Question

I have a custom block with some values I can access in the template of that block, for example the product_type variable. In the same template file I'm adding another view block with {{ drupal_block('views_block:my-view-block_1', {product_type: 'clothes'}) }}.

For that block I implemented this hook.

function myModule_views_pre_view(&$view, &$display_id, &$args) {
// I want to access that product_type variable in this hook
// because I want to add a filter.
$view->display_handler->display['display_options']['filters']['field_product_type_target_id']['default_value'] = $product_type;
}

The hook is invoked, but I cannot get the value of product_type. I'm not sure that is the correct way to achieve it, but I really need to pass that value from first block to second block to filter out results. It's been 2 days I'm trying to figure this out. Any help would be highly appreciated.

Answer 1

Variables are passed from PHP/preprocess to Twig, but never vice versa.

Instead of preprocessesing the filter of the second block, replace the product type filter in the 2nd views block with a "contextual filter" , and pass product_type as contextual argument to the view. And finally - since you are already using Twig Tweak module - use drupal_view to render the 2nd views block:

{{ drupal_view('MY_VIEW_ID', 'MY_VIEWDISPLAY_ID', product_type) }}