Make is_purchasable hook work with variations and product tags In Woocommerce

Question

I'm trying to prevent that visitors buying certain products based on product tags.

I'm using 'woocommerce_is_purchasable' woocommerce filter but it doesn't work with variable products.

This is my code:

    function remove_add_to_cart_for_tag_id ( $purchasable, $product ){

    if( $product->get_tag_ids() == array(181)) {

      $purchasable = false;

    } else {
      return $purchasable;
    }

    if ( $purchasable && $product->is_type( 'variation' ) ) {
        $purchasable = $product->parent->is_purchasable();
    }

    return $purchasable;

}
add_filter( 'woocommerce_is_purchasable', 'remove_add_to_cart_for_tag_id', 10, 2 );
add_filter( 'woocommerce_variation_is_purchasable', 'remove_add_to_cart_for_tag_id', 10, 2 );

I've based my code on this example: Get is_purchasable hook working for Woocommerce product variations too

Answer 1

There is some errors and mistakes in your code. Try the following instead (to make it work with product variations too):

add_filter( 'woocommerce_is_purchasable', 'remove_add_to_cart_for_tag_id', 10, 2 );
add_filter( 'woocommerce_variation_is_purchasable', 'remove_add_to_cart_for_tag_id', 10, 2 );
function remove_add_to_cart_for_tag_id ( $purchasable, $product ){
    // For product variations (from variable products)
    if ( $product->is_type('variation') ){
        $parent = wc_get_product( $product->get_parent_id() );
        $tag_ids = $parent->get_tag_ids(); 
    } 
    // For other product types
    else {
        $tag_ids = $product->get_tag_ids();
    }

    if( in_array( 181, $tag_ids ) ) {
        $purchasable = false;
    }

    return $purchasable;
}

Code goes in function.php file of your active child theme (or active theme). It should work now.