Couldn't get all custom fields

For me, all the custom field data is coming back automatically.

In model/posts.php do you have this code:

function set_custom_fields_value() {
    global $json_api;
    if ($json_api->include_value('custom_fields')) {
      $wp_custom_fields = get_post_custom($this->id);
      $this->custom_fields = new stdClass();
      if ($json_api->query->custom_fields) {
        $keys = explode(',', $json_api->query->custom_fields);
      }
      foreach ($wp_custom_fields as $key => $value) {
        if ($json_api->query->custom_fields) {
          if (in_array($key, $keys)) {
            $this->custom_fields->$key = $wp_custom_fields[$key];
          }
        } else if (substr($key, 0, 1) != '_') {
          $this->custom_fields->$key = $wp_custom_fields[$key];
        }
      }
    } else {
      unset($this->custom_fields);
    }
  }