Woocommerce product rewrite rules not working

Question

I am trying to change the default structure of the woocommerce product url to include the author username. The default url for woocommerce products in my installation is as so:

https://<site_url>/product/<product-name>

I want to change it to something like this:

https://<site_url>/product/<author-username>/<product-name>

This is the code that I have so far:

function so_pre_get_posts( $query ) {
    // check if the user is requesting an admin page
    // or current query is not the main query
    if ( is_admin() || ! $query->is_main_query() ){
        return;
    }
  //since the author is not included in woocommerce query vars add author username to query_vars
  $post_type = get_query_var( 'post_type' );
  if($post_type === 'product'){
    $post_name = get_query_var( 'name');
    if ( $post = get_page_by_path($post_name,OBJECT,'product') ){
      $id = $post->ID;
      $author_id = get_post_field( 'post_author', $id );
      $author = get_userdata($author_id);
      $author_username = $author->user_login;
      $query->set( 'seller',$author_username);
    }else{
      return;
    }
  }
}

//add rewrite rules
function so_rewrite_tag_rule() {
  add_rewrite_tag( '%seller%', '([^&]+)' );
    add_rewrite_rule('^product/([^/]+)/([^/]+)/?$', 'index.php?seller=$matches[1]&name=$matches[2]','top');
  flush_rewrite_rules();
}
add_action( 'pre_get_posts', 'so_pre_get_posts', 1 );
add_action('init', 'so_rewrite_tag_rule', 10, 0);

However when I visit the product page for any product it still resolves to the default woocommerce permalink structure. I made sure to flush the permalinks in my code so I have no idea what the issue is.

Answer 1

No need to add additional rewrite rule for that, WooCommerce already provide a way to mess with product permalink. Visit Wp Admin > General > Permalink page, and use /product/%author%/ as Product permalinks value. This will organize the product url as you need.

However, WooCommerce won't replace %author% tag with product's author as like we see with post permalink, so you have to replace the tag using post_type_link filter.

// replace %author%

add_filter( 'post_type_link', 'wpse_post_type_link', 20, 2 );

function wpse_post_type_link( $permalink, $post ) {
    if ( 'product' === $post->post_type && false !== strpos( $permalink, '%author%' ) ) {
        $author = get_the_author_meta( 'user_nicename', $post->post_author );
        $permalink = str_replace( '%author%', $author, $permalink );
    }

    return $permalink;
}