Attachments empty

Do you have a multi-site install? Does this install use paths, not subdomains? I was having the same problem, and noticed that the JSON-API for attachments only works on the main blog (residing at ABSPATH)

If you donwload version 1.0.7 (2011-01-27) and use models/attachment.php from that zip, your problem will be resolved.
I will file a bug (and waited way to long to upgrade…)
hth

@wywarren, i’ve suggested a patch for this bug in this post: https://www.ads-software.com/support/topic/modelsattachmentphp-bug-with-getting-attachments-on-folder-mulit-site-installs

Nope it’s actually a single site. Turns out if you have a different wordpress install ur; than your site url it could cause this. Turns out the fix is this: https://www.ads-software.com/support/topic/thumbnails-not-included-for-attachment-fix?replies=5

function query_images() {
    $sizes = array('thumbnail', 'medium', 'large', 'full');
    if (function_exists('get_intermediate_image_sizes')) {
      $sizes = array_merge(array('full'), get_intermediate_image_sizes());
    }
    $this->images = array();
    $upload_dir = wp_upload_dir();
    foreach ($sizes as $size) {
      list($url, $width, $height) = wp_get_attachment_image_src($this->id, $size);
      $filename = str_replace( $upload_dir['baseurl'], $upload_dir['basedir'], $url);
      if (file_exists($filename)) {
        list($measured_width, $measured_height) = getimagesize($filename);
        if ($measured_width == $width &&
            $measured_height == $height) {
          $this->images[$size] = (object) array(
            'url' => $url,
            'width' => $width,
            'height' => $height
          );
        }
      }
    }
  }

Just replace that function located in models/attachment.php and you will get back your thumbnails (featured image) in JSON API

I guess this is resolved but should be updated according in the actual plugin in a later release.

I had a similar problem, but I’m using the WP Read Only plugin (I’m running WordPress on Heroku). This plugin makes sure all images are uploaded to S3. The thumbnails were null also.

I rewritten the above function and deleted the checks whether the file exists. It works now, but obviously does not check for the file’s existence:

function query_images() {
    $sizes = array('thumbnail', 'medium', 'large', 'full');
    if (function_exists('get_intermediate_image_sizes')) {
      $sizes = array_merge(array('full'), get_intermediate_image_sizes());
    }
    $this->images = array();
    $home = get_bloginfo('url');
    $upload_dir = wp_upload_dir();
    $basedir = $upload_dir['basedir'];
    $file = get_post_meta($this->id, '_wp_attached_file', true);

    foreach ($sizes as $size) {
      list($url, $width, $height) = wp_get_attachment_image_src($this->id, $size);
      $filename = $basedir . '/' . str_replace(basename($file), basename(parse_url($url, PHP_URL_PATH)), $file);
      list($measured_width, $measured_height) = getimagesize($filename);
      $this->images[$size] = (object) array(
        'url' => $url,
        'width' => $width,
        'height' => $height
      );
    }
  }