Remove Custom Post Type Slug from Permalinks 2

remove-custom-post-type-slug-from-permalinks-2.php

/**
 * Have WordPress match postname to any of our public post types (page, post, race)
 * All of our public post types can have /post-name/ as the slug, so they better be unique across all posts
 * By default, core only accounts for posts and pages where the slug is /post-name/
 */
function gp_parse_request_trick( $query ) {
 
    // Only noop the main query
    if ( ! $query->is_main_query() )
        return;
 
    // Only noop our very specific rewrite rule match
    if ( 2 != count( $query->query ) || ! isset( $query->query['page'] ) ) {
        return;
    }
 
    // 'name' will be set if post permalinks are just post_name, otherwise the page rule will match
    if ( ! empty( $query->query['name'] ) ) {
        $query->set( 'post_type', array( 'post', 'race', 'page' ) );
    }
}
add_action( 'pre_get_posts', 'gp_parse_request_trick' );