Wordpress how to get field from parent category

Question

I'm trying to display an image in a custom field on child category archive pages.

The current setup is:

<?php
    $term_id = get_queried_object()->term_id;
    $post_id = 'product_cat_'.$term_id;
    $custom_field = get_field('brand_background', $post_id);
?>

<div id="brandHeader" class="brand-header-logo" style="background-image: url('<?php the_field('brand_background', $post_id); ?>');">

This obviously gets the 'background image' field from the category archive it's currently on.

If the category is a child category I want to be able to pull the 'background image' from the parent category. I've tried a few things but doesn't seem to be working - can anyone help?

Answer 1

You could use the get_ancestors function to get the parent id and use that id to get your field:

get_ancestors

So let's say your categories looks like this:

-Parent (id = 24)
--Child (id = 42)

$term_id = get_queried_object()->term_id;

$term_ancestor_ids = get_ancestors($term_id, 'product_cat');

// if you do a print_r on $term_ancestor_ids
// you'll see this: 
// Array ( [0] => 24 )

$post_id = 'product_cat_'.$term_ancestor_ids[0];

$custom_field = get_field('brand_background', $post_id);

Tested and works, let me know if you were able to get it to work too!