Hide specific WooCommerce products for non logged in users based on the product meta key

This code snippet is based on the meta key product_access. It uses the following two conditions to update the WP Query based on this custom meta key defined in the WooCommerce products.

Prerequisites –  To make the following functionality work you must add the product_access meta key to the products. You can do this via ACF or custom meta boxes etc.

Case 1: No meta key is present

If the product_access meta key is not defined in the product then it means this product is available to all users.

Case 2:  Meta is present

If the meta key product_access is present and has some value, then we can check that value. In this example we are assuming that if it values is 0 then the product can be viewed by all users and if its value is 1 then it can be viewed by logged-in users only.

//Hide specific products for non logged in users in woocommerce
function rp_hide_product_non_logged_in_users( $query ) {
    if ( ! is_admin() &&  $query->is_main_query() && !is_user_logged_in()) {
        $meta_query = $query->get( 'meta_query' ) ?: array();
        $meta_query[] = array(
            'relation' => 'OR',
            array(
            'key'     => 'product_access',
            'compare' => 'NOT EXISTS',
            ),
            array(
                'key' => 'product_access',
                'value' => '0',
                'compare' => '=',
            )
        );
        $query->set( 'meta_query', $meta_query );
    }
}
add_action( 'pre_get_posts', 'rp_hide_product_non_logged_in_users' );

Note –  This code snippet will not work with custom ajax based queries, for that you have to integrate this custom meta_query in your custom WP Queries.