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I have an array of image id's and i want assign them to the specific post:

foreach ($image_ids as  $image_id)
    var_dump(wp_insert_post(array('ID' => $image_id, 'post_parent' => $new_post_id), TRUE));

But there occurs error:

object(WP_Error)#252 (2) {
  array(1) {
    array(1) {
      string(38) "Content, title, and excerpt are empty."
  array(0) {

So is it possible to update the post_parent without updating other data?

share|improve this question
up vote 1 down vote accepted

Use wp_update_post(), not insert.

        'ID' => $image_id, 
        'post_parent' => $new_post_id
share|improve this answer
Thanks a lot. But in codex.wordpress.org/Function_Reference/wp_insert_post is told that if ID exists - it updates current post... – user1692333 Jan 9 '13 at 22:49
Well, yes, the post_parent information is always stored in the child posts, not in the parent. So you have to update the image (post type attachment) to assign it to a parent post. – toscho Jan 9 '13 at 22:53
so i did this wp_insert_post(array('ID' => $image_id, 'post_parent' => $new_post_id) – user1692333 Jan 9 '13 at 23:15
I know that it's old discussion, but if you use wp_insert_post you need to specify all the fields. The fields that aren't in the arguments are updated with the default values. with wp_update_post you just need to specify the fields you want to change and all the other fields will keep the value. – Ricardo BRGWeb Apr 25 '15 at 13:53

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