has_post_thumbnail() Returns False on Scheduled Posts

Question

I am making some changes to a custom WP template and have hit an odd issue. Published posts work absolutely fine, but when you view a scheduled post the Featured Image disappears.

It's as if there was no featured image at all and has_post_thumbnail() returns false. Here's the relevant piece of code I'm working with, relatively simple stuff really:

while (have_posts()) : the_post();
  if (has_post_thumbnail($post->ID)) {
    $featuredImage = wp_get_attachment_url(get_post_thumbnail_id($post->ID));
  }
}

And again, this works fine on published posts but as soon as I set the date to the future the image stops coming through. It seems strange that images would be treated differently based on the publish date, is there anything which WP changes on scheduled posts vs live posts which could be causing this?

Answer 1

Well it turns out that the reason has_post_thumbnail() was failing was because get_post_meta() was returning empty for scheduled posts. I'm still not sure why, but in case someone else has the issue, my workaround was to create a new function to fetch the featured image ID without relying on get_post_meta():

function get_featured_image_id($postID) {
    global $wpdb;
    $data = $wpdb->get_results($wpdb->prepare("SELECT meta_value FROM wp_postmeta WHERE post_id = %d AND meta_key = '_thumbnail_id'", $postID));
    if (!empty($data[0]->meta_value)) {
        return $data[0]->meta_value;
    }
}

Then you can get a featured image URL in your template with the following line:

wp_get_attachment_url(get_featured_image_id($post->ID))

Answer 2

Its too much simple

while (have_posts()) : the_post();
    if (has_post_thumbnail($post->ID)) {
        $featuredImage = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID,'full'));
        echo $featuredImage;
    }
}