Assign a tag to custom post type using a query

Question

I have a custom post type courses with a custom field level. I want to run a query (mysql or WP query) that runs through every course (post) and if the level is greater than 3, append a tag called higher to it.

How would I go about this please?

Many thanks

Tim

Answer 1

Put code below to your functions.php

add_filter('pre_get_posts', 'query_post_type'); function query_post_type($query) { if(is_category() || is_tag()) { $post_type = get_query_var('post_type'); if($post_type) $post_type = $post_type; else $post_type = array('post','cpt'); // replace cpt to your custom post type $query->set('post_type',$post_type); return $query; } }