WordPress 3.3 custom post type with /%postname%/ permastruct?

There is earlier post with similar title, but it does not look in to the WordPress 3.3, and that is important as 3.3 advertises interestingly: “Use the postname permalink structure without a performance penalty”

Problem with WordPress 3.2 and earlier was that first it looked page names, and then 404. It didn’t check the arbitrary post types first. 3.3 on the other hand must look post types, then pages, and finally 404 (as it advertises this feature). This implies that custom post types without slug should be simple, if they didn’t hard code post_type=post somewhere.

I can’t find a 3.3 specific solution yet though.

Question: How can I define permalink struct “/%postname%/” for any given custom post type “xyz”?

Thanks.

This isn’t easily done in WP 3.3 unless you trick the rewrite rules to be in the correct spot and make wp_rewrite think verbose rules are being used in the front end. The class below works.

class Test_Post_Type {
    const POST_TYPE = 'test';

    public static function init() {
        global $wp_rewrite;

        $post_type_obj = register_post_type( self::POST_TYPE, array(
            'labels' => array(
                'name' => __( 'Tests' ),
                'singular_name' => __( 'Test' ),
                'add_new' => __( 'Add New' ),
                'add_new_item' => __( 'Add New Test' ),
                'edit_item' => __( 'Edit Test' ),
                'new_item' => __( 'New Test' ),
                'all_items' => __( 'All Tests' ),
                'view_item' => __( 'View Test' ),
                'search_items' => __( 'Search Tests' ),
                'not_found' => __( 'No Tests found' ),
                'not_found_in_trash' => __( 'No Tests found in Trash' ),
                'menu_name' => __( 'Tests' )
            ),
            'publicly_queryable' => true,
            'exclude_from_search' => true,
            'hierarchical' => false,
            'public' => true,
            'rewrite' => false,
            'has_archive' => true,
            'supports' => array( 'title', 'editor', 'thumbnail', 'test_source' ),
            'taxonomies' => array( 'category', 'post_tag' ),
        ) );

        $post_type_obj = get_post_type_object(self::POST_TYPE);

        //register the rewrite tag for permalink building
        $wp_rewrite->add_rewrite_tag( '%' . $post_type_obj->query_var . '%', '([^/]+)', $post_type_obj->query_var . '=' );

        //we have to add the permastruct here in order to build the permalink, otherwise we'll need to filter the post_type link
        add_permastruct(self::POST_TYPE, '%' . $post_type_obj->query_var . '%/', false );

        //add a filter to remove the permastructs generated above
        add_filter(self::POST_TYPE . '_rewrite_rules', array(__CLASS__, '_remove_default_rules')); 

        //now we add a filter to put the generated rewrite rules in the correct spot
        add_action('generate_rewrite_rules', array(__CLASS__, '_filter_rewrite_rules'));

        if(!is_admin()) {
            //we need verbose_page_rules to be on on the front end in order for pages to be process properly
            $wp_rewrite->use_verbose_page_rules = true;
        }
    }

    /**
     * Filter to remove the rules for this post type when they're automatically generated due to the permastruct registration
     * @param type $rules
     * @return type 
     */
    public static function _remove_default_rules($rules) {
        return array();
    }

    /**
     * Filters the rules at the end to add back the ones for this post type at the bottom
     * @param WP_Rewrite $wp_rewrite 
     */
    public static function _filter_rewrite_rules($wp_rewrite) {
        $post_type_obj = get_post_type_object(self::POST_TYPE);
        $my_rules = $wp_rewrite->generate_rewrite_rules('%' . $post_type_obj->query_var . '%', EP_NONE);
        $wp_rewrite->rules += $my_rules;
    }

}

add_action( 'init', array( 'Test_Post_Type', 'init' ) );