Reply To: Set image as featured image

• boriskamp1991

• December 10, 2014 at 1:20 am

Thanks both of you for your replies! it’s stange to me, I did a search for _thumbnail_id but did not find any documentation on it by WordPress so I thought it was something you created!

Thanks for the heads-up on the $value->ID @Jonathan!
I want my post thumbnail to update on existing posts as well as to add on new posts so I went to update_post_meta and removed the if statement, now I have this:

//Auto assign Featured image from 'post_image'
function acf_set_featured_image( $value, $post_id, $field  ){
  update_post_meta($post_id, '_thumbnail_id', $value->ID);
  return $value;
}

add_filter('acf/update_value/name=post_image', 'acf_set_featured_image', 10, 3);

which is not working…. What am I missing? thanks again!