Add a hierarchical Level taxonomy to a Course post type
Description: Register a post type course and a hierarchical taxonomy level. Add the terms Beginner and Advanced. Create a course WordPress Basics in the level Beginner, and list the courses of that level with WP_Query.
Hint:
register_taxonomy( 'level', 'course', array( 'hierarchical' => true ) ).- Use a
tax_queryfor the list.
Solution
<?php
/**
* Plugin Name: Courses
*/
add_action( 'init', function () {
register_post_type( 'course', array( 'label' => 'Courses', 'public' => true, 'show_in_rest' => true ) );
register_taxonomy( 'level', 'course', array( 'label' => 'Levels', 'hierarchical' => true, 'show_in_rest' => true ) );
} );
$ wp plugin activate tc-courses
Plugin 'tc-courses' activated.
Success: Activated 1 of 1 plugins.
$ wp term create level "Beginner" –slug=beginner –porcelain
2
$ wp term create level "Advanced" –slug=advanced –porcelain
3
$ wp post create –post_type=course –post_title="WordPress Basics" –post_status=publish –porcelain
5
$ wp post create –post_type=course –post_title="Plugin Security" –post_status=publish –porcelain
6
$ wp post term add 5 level beginner
Success: Added term.
$ wp post term add 6 level advanced
Success: Added term.
$q = new WP_Query( array(
'post_type' => 'course',
'tax_query' => array( array( 'taxonomy' => 'level', 'field' => 'slug', 'terms' => 'beginner' ) ),
) );
foreach ( $q->posts as $p ) {
echo $p->post_title . "\n";
}WordPress Basics
How it works
- A taxonomy is registered for a post type, and its terms are connected to the posts through
wp_term_relationships. - The
tax_queryasks only for the posts which have the term beginner.
Read Custom Taxonomies.
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