Reply To: Repeater and Flexible Fields not Saving Values from FrontEnd

• John Huebner

• July 12, 2015 at 7:59 am

I think you may be right.

The problem is that you need the attachment/image ID in order to set the post thumbnail.

But instead of do_action, in your pre save post function change it to:

add_action('acf/save_post', 'tsm_save_image_field_to_featured_image', 20);

I’ve set the priority to 20 above so it runs after the acf save post action and ACF has saved all of the custom fields.

function tsm_save_image_field_to_featured_image( $post_id ) {

  // this function will only be called if the pre_save_post
  // filter was run because that's where we added the hook
  // so you can remove all the tests
  // I am using get_post_meta here to make sure
  // we get the ID of the image field no matter what you have
  // set the image field to return (URL, ID or Object)
  $attachment_id = intval(get_post_meta($post_id, 'your_image_field', true));
  if ($attachment_id) {
    set_post_thumbnail($post, $attachment_id);
  }