Associating a CPT with default taxonomies

written by: Jeff McNear

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Associating a CPT with default taxonomies

There are arguments against having multiple post types share a common taxonomy – mainly since the back-end sorting interface will not work as completely as you may want it to. If more than one post type use a taxonomy you can really only sort the array of posts a single time before having to start over (since a second sort will give the user an “invalid post type” prompt). But there are cases when the front-end wants to see mixed results…

Just adding “categories” to the the “taxonomy” line like this isn’t enough

'taxonomies'            => array( 'category', 'reviewed'),

Since the real point of a shared taxonomy is to show both post types in a category array you will need to explicitly allow it in your functions file like this:

//SOURCE: https://premium.wpmudev.org/blog/add-custom-post-types-to-tags-and-categories-in-wordpress/ 
function themeprefix_show_cpt_archives( $query ) {
 if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
 $query->set( 'post_type', array(
 'post', 'nav_menu_item', 'ratings_reviews'
 ));
 return $query;
 }
}
add_filter( 'pre_get_posts', 'themeprefix_show_cpt_archives' );

You will also want both post types to appear in search results by adding something like this in your functions file:

//SOURCE: https://thomasgriffin.com/how-to-include-custom-post-types-in-wordpress-search-results/
function tg_include_custom_post_types_in_search_results( $query ) {
    if ( $query->is_main_query() && $query->is_search() && ! is_admin() ) {
        $query->set( 'post_type', array( 'post', 'ratings_reviews' ) );
    }
}
add_action( 'pre_get_posts', 'tg_include_custom_post_types_in_search_results' );

and if you have a query in a template, you will need to do something like this:

<?php
$loop = new WP_Query(
  // again we need to make the custom post type inclusion explicit
    array(
        'post_type' => array('post','ratings_reviews'),
        'category_name'   => get_field('category_slug_name'), 
    )
);
while ( $loop->have_posts() ) : $loop->the_post();
// The content you want to loop goes in here:
?>