Update select options

• pelatoscatenato

• October 19, 2018 at 3:40 am

I’m trying to get only sub categories from a parent category in a custom field but I can’t get the result.

My field is a single select field, with “allow null” option enabled.
My code:

function filter_by_stato_field($field) {
    $args = array(
        'type' => 'film',
        'child_of' => 55, //category parent
        'parent' => '',
        'orderby' => 'name',
        'order' => 'ASC',
        'hide_empty' => 0,
        'hierarchical' => 1,
        'exclude' => '',
        'include' => '',
        'number' => '',
        'taxonomy' => 'category',
        'pad_counts' => false
    );
    $categories = get_categories($args);

    $choices = array();

    foreach ($categories as $category) {
        // var_dump($category);
        $id = $category->cat_ID;//set value as category id
        $name = $category->cat_name;//label as category name
        $choices[$id] = $name;
    }
    $field['choices'] = $choices;
	   return $field;
}

add_filter('acf/load_field/name=film-stato-pubblicazione', 'filter_by_stato_field');

I get the results from the query and correctly populate $field array.
But when I check in my post editing screen, I still find all categories and not only sub categories from ID=55 parent.

Can you help me?
Thanks in advance