Reply To: Show only categories in the relationship field taxonomy filter

• netseven

• June 24, 2021 at 10:02 pm

This works (for me)

add_filter('acf/load_field/key={FIELD_KEY}', 'load_just_categories_filter', 12, 1);

function load_just_categories_filter( $field ) {
    
    $terms = get_terms( array(
        'taxonomy' => 'category',
        'hide_empty' => false
    ) );
    if ( !empty($terms) ) {
        foreach( $terms as $term ) {
            $field['taxonomy'][] = 'category:'.$term->slug;
        }
    }

    return $field;
}