ForumManager::getTopics

public ForumManager::getTopics($tid, AccountInterface $account)

public function getTopics($tid, AccountInterface $account) {
  $config = $this->configFactory->get('forum.settings');
  $forum_per_page = $config->get('topics.page_limit');
  $sortby = $config->get('topics.order');

  $header = array(
    array('data' => $this->t('Topic'), 'field' => 'f.title'),
    array('data' => $this->t('Replies'), 'field' => 'f.comment_count'),
    array('data' => $this->t('Last reply'), 'field' => 'f.last_comment_timestamp'),
  );

  $order = $this->getTopicOrder($sortby);
  for ($i = 0; $i < count($header); $i++) {
    if ($header[$i]['field'] == $order['field']) {
      $header[$i]['sort'] = $order['sort'];
    }
  }

  $query = $this->connection->select('forum_index', 'f')
    ->extend('Drupal\Core\Database\Query\PagerSelectExtender')
    ->extend('Drupal\Core\Database\Query\TableSortExtender');
  $query->fields('f');
  $query
  ->condition('f.tid', $tid)
    ->addTag('node_access')
    ->addMetaData('base_table', 'forum_index')
    ->orderBy('f.sticky', 'DESC')
    ->orderByHeader($header)
    ->limit($forum_per_page);

  $count_query = $this->connection->select('forum_index', 'f');
  $count_query->condition('f.tid', $tid);
  $count_query->addExpression('COUNT(*)');
  $count_query->addTag('node_access');
  $count_query->addMetaData('base_table', 'forum_index');

  $query->setCountQuery($count_query);
  $result = $query->execute();
  $nids = array();
  foreach ($result as $record) {
    $nids[] = $record->nid;
  }
  if ($nids) {
    $nodes = $this->entityManager->getStorage('node')->loadMultiple($nids);

    $query = $this->connection->select('node_field_data', 'n')
      ->extend('Drupal\Core\Database\Query\TableSortExtender');
    $query->fields('n', array('nid'));

    $query->join('comment_entity_statistics', 'ces', "n.nid = ces.entity_id AND ces.field_name = 'comment_forum' AND ces.entity_type = 'node'");
    $query->fields('ces', array(
      'cid',
      'last_comment_uid',
      'last_comment_timestamp',
      'comment_count'
    ));

    $query->join('forum_index', 'f', 'f.nid = n.nid');
    $query->addField('f', 'tid', 'forum_tid');

    $query->join('users_field_data', 'u', 'n.uid = u.uid AND u.default_langcode = 1');
    $query->addField('u', 'name');

    $query->join('users_field_data', 'u2', 'ces.last_comment_uid = u2.uid AND u.default_langcode = 1');

    $query->addExpression('CASE ces.last_comment_uid WHEN 0 THEN ces.last_comment_name ELSE u2.name END', 'last_comment_name');

    $query
    ->orderBy('f.sticky', 'DESC')
      ->orderByHeader($header)
      ->condition('n.nid', $nids, 'IN')
      // @todo This should be actually filtering on the desired node language
      //   and just fall back to the default language.
      ->condition('n.default_langcode', 1);

    $result = array();
    foreach ($query->execute() as $row) {
      $topic = $nodes[$row->nid];
      $topic->comment_mode = $topic->comment_forum->status;

      foreach ($row as $key => $value) {
        $topic->{$key} = $value;
      }
      $result[] = $topic;
    }
  }
  else {
    $result = array();
  }

  $topics = array();
  $first_new_found = FALSE;
  foreach ($result as $topic) {
    if ($account->isAuthenticated()) {
      // A forum is new if the topic is new, or if there are new comments since
      // the user's last visit.
      if ($topic->forum_tid != $tid) {
        $topic->new = 0;
      }
      else {
        $history = $this->lastVisit($topic->id(), $account);
        $topic->new_replies = $this->commentManager->getCountNewComments($topic, 'comment_forum', $history);
        $topic->new = $topic->new_replies || ($topic->last_comment_timestamp > $history);
      }
    }
    else {
      // Do not track "new replies" status for topics if the user is anonymous.
      $topic->new_replies = 0;
      $topic->new = 0;
    }

    // Make sure only one topic is indicated as the first new topic.
    $topic->first_new = FALSE;
    if ($topic->new != 0 && !$first_new_found) {
      $topic->first_new = TRUE;
      $first_new_found = TRUE;
    }

    if ($topic->comment_count > 0) {
      $last_reply = new \stdClass();
      $last_reply->created = $topic->last_comment_timestamp;
      $last_reply->name = $topic->last_comment_name;
      $last_reply->uid = $topic->last_comment_uid;
      $topic->last_reply = $last_reply;
    }
    $topics[$topic->id()] = $topic;
  }

  return array('topics' => $topics, 'header' => $header);

}