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1. skeg64
   Member
   Posted 1 year ago #

   Here is a function to automatically select the ancestor terms for the selected terms when a post is saved.

   Note that this will apply to all post types, and all taxonomies associated with the post type.

   add_action('save_post', 'jr_select_ancestor_terms', 12, 2); // automatically select ancestor terms
   function jr_select_ancestor_terms($post_id, $post) {
   	if( $post->post_type == 'revision' ) return; // Don't store data twice
   	foreach ($_POST['tax_input'] as $taxname => $termids) {
   		foreach ($termids as $termid) {
   			$parenttags = get_ancestors($termid,$taxname);
   			wp_set_object_terms( $post->ID, $parenttags, $taxname, true );
   		}
   	}
   }

   I would appreciate feedback & improvements.

2. skeg64
   Member
   Posted 1 year ago #

   This revision provides better compatibility with plugins (doesn't rely on POST data), and only updates custom taxonomies, not built-in ones.

   add_action('save_post', 'jr_select_parent_terms', 10, 2); // automatically select parent terms
   function jr_select_parent_terms($post_id, $post) {
   	if( $post->post_type == 'revision' ) return;
   	$taxonomies = get_taxonomies(array('_builtin' => false));
   	foreach ($taxonomies as $taxonomy ) {
   		$terms = wp_get_object_terms($post->ID, $taxonomy);
   			foreach ($terms as $term) {
   				$parenttags = get_ancestors($term->term_id,$taxonomy);
   				wp_set_object_terms( $post->ID, $parenttags, $taxonomy, true );
   		}
   	}
   }

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