Reply To: Attach images created in front end form to custom post

• markbloomfield

• May 16, 2017 at 7:50 pm

This is quite an old post, but I had to do something similar here and I did it in a slightly different way to the solution above so figured I’d share:

In my scenario, the user uploads images (which are correctly assigned a post_parent), and a couple PDF posts (which weren’t being correctly assigned).

function attachment_change_parent($aid,$pid) {
  $update_attachment_post = array(
    'ID'            => $aid,
    'post_parent'   => $pid
  );

  wp_update_post($update_attachment_post);
}

Instead of doing a SQL query, I just used the native wp_update_post function to update the attachment’s post_parent to be the ID of the newly created post.

Then my PDF field was set to return an array, not a post ID. So in my pre_save_post function, I had to get that ID slightly differently:

attachment_change_parent($_POST['acf']['field_58a18e2988392'][0], $post_id);

…where you’d obviously just update that field key to be the key of your upload field.

Works a dream. Thanks!