Using Wordpress Tags with Custom Post Types, goes in functions.php

Using Wordpress Tags with Custom Post Types

// Using Tags with Custom Post Types, goes in functions.php

    function add_custom_types( $query ) {
    if( is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {

        // this gets all post types:
        // $post_types = get_post_types();

        // alternately, you can add just specific post types using this line instead of the above:
        $post_types = array( 'post', 'news' );

        $query->set( 'post_type', $post_types );
        return $query;
        }
    }
    add_filter( 'pre_get_posts', 'add_custom_types' );