Meta Slider by Slug

gistfile1.txt

/**
 * Filter the shortcode attributes.
 * If the ID parameter is not an integer, assume it is a slug.
 * Convert the slug to an ID and return the attributes.
 */
function metaslider_shortcode_slug( $atts ) {

	if ( isset( $atts['id'] ) && ! is_int( $atts['id'] ) ) {

        $slider = get_page_by_path( $atts['id'], OBJECT, 'ml-slider' );

        if ( $slider ) {
            $atts['id'] = $slider->ID;
        }

	}

	return $atts;

}
add_filter('shortcode_atts_metaslider', 'metaslider_shortcode_slug', 10, 3);

/**
 * Ensure the post_name (slug) is updated when a slideshow title
 * is updated.
 */
function metaslider_update_slug_on_save( $data , $postarr ) {

	if ( isset( $postarr['post_type'] ) && $postarr['post_type'] == 'ml-slider' ) {

	    $data[ 'post_name' ] = sanitize_title( $postarr[ 'post_title' ] );

	}

	return $data;

}
add_filter( 'wp_insert_post_data' , 'metaslider_update_slug_on_save' , 10, 2 );