Thanks!
Making some headway, here is my new test code:
function my_post_object_query( $args, $field, $post )
{
$args['cat'] = wp_get_post_categories($post->ID);
echo '<pre>';
print_r($args);
echo '</pre>';
//die;
return $args;
}
// filter for a specific field based on it's key
add_filter('acf/fields/post_object/query/key=field_524f02159316d', 'my_post_object_query', 10, 3);
This returns the following array:
Array
(
[numberposts] => -1
[post_type] => post_images
[orderby] => title
[order] => ASC
[post_status] => Array
(
[0] => publish
[1] => private
[2] => draft
[3] => inherit
[4] => future
)
[suppress_filters] =>
[sort_column] => menu_order, post_title
[sort_order] => ASC
[cat] => Array
(
[0] => 5
)
)
you can see the cat id is getting added, but the results that come back in the dropdown are not filter to only include posts form catid 5
