Add body class to custom post type

Question

I'd like to add a category class to body_class for custom post type to change body background color. I tried to rework the following code to work with custom post types, but no dice. It works with posts, but not the custom post type.

add_filter('body_class','add_category_to_single');
  function add_category_to_single($classes) {
    if (is_singular() ) {
      global $post;
      foreach((get_the_category($post->ID)) as $category) {
        // add category slug to the $classes array
        $classes[] = $category->category_nicename;
      }
    }
    // return the $classes array
    return $classes;
  }

I'm using Pods plugin and the latest WP.

Answer 1

your code only works if you are using category taxonomy.

if you are using custom taxonomy like brands you must change your code to this:

function add_category_to_single( $classes ) {
    if ( is_singular() ) {
        global $post;

        $taxonomy = 'brands';
        $terms = get_the_terms( $post->ID, $taxonomy );

        if ( ! empty( $terms ) && ! is_wp_error( $terms ) ) {
            foreach ( $terms as $term ) {
                $classes[] = $term->slug;
            }
        }
    }

    return $classes;
}

add_filter( 'body_class', 'add_category_to_single' );

Answer 2

Wordpress as designed will add the class of the post type that you create to the body class list.

As an example if your post type is wspe_cats, wordpress will inject single-wspe-cats to the body of the single post for your CPT.

Similarly it will do the same for that CPT archive.

Let's say I create a taxonomy for my cpt called wspe-breeds, and set 3 terms (black, white, calico).

If I have an archive post for wspe_cats, WordPress will automatically add archive tax-wspe-breeds to the body.

If I went to the archive for my custom post taxonomy to look at calico cats, WordPress will automatically add archive tax-wspe-breeds to the body along with the these additional classes term-calico term-3 to the body of that archive. (Three came from the fact that that is the term's ID.)

So, if I'm reading your question correctly, there is no code that you need to create...WordPress did the heavy lifting!