ForumManager::getForumStatistics

protected ForumManager::getForumStatistics($tid)

protected function getForumStatistics($tid) {
  if (empty($this->forumStatistics)) {
    // Prime the statistics.
    $query = $this->connection->select('node_field_data', 'n');
    $query->join('comment_entity_statistics', 'ces', "n.nid = ces.entity_id AND ces.field_name = 'comment_forum' AND ces.entity_type = 'node'");
    $query->join('forum', 'f', 'n.vid = f.vid');
    $query->addExpression('COUNT(n.nid)', 'topic_count');
    $query->addExpression('SUM(ces.comment_count)', 'comment_count');
    $this->forumStatistics = $query
    ->fields('f', array('tid'))
      ->condition('n.status', 1)
      ->condition('n.default_langcode', 1)
      ->groupBy('tid')
      ->addTag('node_access')
      ->execute()
      ->fetchAllAssoc('tid');
  }

  if (!empty($this->forumStatistics[$tid])) {
    return $this->forumStatistics[$tid];
  }
}