/**
  * Render custom columns
  * @see https://codex.wordpress.org/Plugin_API/Action_Reference/manage_$post_type_posts_custom_column
  *
  * @since 3.3.0
  *
  * @param string $column the current column.
  * @param int $entity_id An entity post id.
  *
  * @return true if the post is an entity otherwise false.
  */
 public function render_custom_columns($column, $entity_id)
 {
     switch ($column) {
         case 'wl_column_related_posts':
             echo count(wl_core_get_related_post_ids($entity_id));
             break;
         case 'wl_column_thumbnail':
             $edit_link = get_edit_post_link($entity_id);
             $thumb = get_the_post_thumbnail($entity_id, array(self::THUMB_SIZE, self::THUMB_SIZE));
             if (!$thumb) {
                 $thumb = "<img src='" . WL_DEFAULT_THUMBNAIL_PATH . "' width='" . self::THUMB_SIZE . "' />";
             }
             echo "<a href='{$edit_link}'>{$thumb}</a>";
             break;
         case 'wl_column_rating':
             $rating = $this->entity_service->get_rating_for($entity_id);
             echo '<i class="wl-traffic-light wl-tl-' . $rating['traffic_light_score'] . '">' . $rating['percentage_score'] . '%</i>';
             break;
     }
 }