Change author base and slug in author link

i found out what i was doing wrong, i used this part like i mentioned

add_filter( 'request', 'wpse5742_request' );
function wpse5742_request( $query_vars )
{
if ( array_key_exists( 'author_name', $query_vars ) ) {
    global $wpdb;
    $author_id = $wpdb->get_var( $wpdb->prepare( "SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key='nickname' AND meta_value = %s", $query_vars['author_name'] ) );
    if ( $author_id ) {
        $query_vars['author'] = $author_id;
        unset( $query_vars['author_name'] );    
    }
}
return $query_vars;
}

and changed the meta_key=”nickname” in $author_id = $wpdb->get_var( $wpdb->prepare( "SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key='nickname' AND meta_value = %s", $query_vars['author_name'] ) ); with my custom metabox meta key this managed to find the author id and add it to the $query_vars successfully