NodeNewComments.php

<?php

/**
 * @file
 * Definition of Drupal\comment\Plugin\views\field\NodeNewComments.
 */
namespace Drupal\comment\Plugin\views\field;

use Drupal\views\Plugin\views\field\Numeric;
use Drupal\views\ViewExecutable;
use Drupal\Core\Annotation\Plugin;

/**
 * Field handler to display the number of new comments.
 *
 * @ingroup views_field_handlers
 *
 * @Plugin(
 *   id = "node_new_comments",
 *   module = "comment"
 * )
 */
class NodeNewComments extends Numeric {

  /**
   * Overrides Drupal\views\Plugin\views\field\FieldPluginBase::init().
   */
  public function init(ViewExecutable $view, &$options) {
    parent::init($view, $options);
    $this->additional_fields['nid'] = 'nid';
    $this->additional_fields['type'] = 'type';
    $this->additional_fields['comment_count'] = array(
      'table' => 'node_comment_statistics',
      'field' => 'comment_count',
    );
  }
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['link_to_comment'] = array(
      'default' => TRUE,
      'bool' => TRUE,
    );
    return $options;
  }
  public function buildOptionsForm(&$form, &$form_state) {
    $form['link_to_comment'] = array(
      '#title' => t('Link this field to new comments'),
      '#description' => t("Enable to override this field's links."),
      '#type' => 'checkbox',
      '#default_value' => $this->options['link_to_comment'],
    );
    parent::buildOptionsForm($form, $form_state);
  }
  public function query() {
    $this
      ->ensureMyTable();
    $this
      ->add_additional_fields();
    $this->field_alias = $this->table . '_' . $this->field;
  }
  function pre_render(&$values) {
    global $user;
    if (!$user->uid || empty($values)) {
      return;
    }
    $nids = array();
    $ids = array();
    foreach ($values as $id => $result) {
      $nids[] = $result->{$this->aliases['nid']};
      $values[$id]->{$this->field_alias} = 0;

      // Create a reference so we can find this record in the values again.
      if (empty($ids[$result->{$this->aliases['nid']}])) {
        $ids[$result->{$this->aliases['nid']}] = array();
      }
      $ids[$result->{$this->aliases['nid']}][] = $id;
    }
    if ($nids) {
      $query = db_select('node', 'n');
      $query
        ->addField('n', 'nid');
      $query
        ->innerJoin('comment', 'c', 'n.nid = c.nid');
      $query
        ->addExpression('COUNT(c.cid)', 'num_comments');
      $query
        ->leftJoin('history', 'h', 'h.nid = n.nid');
      $query
        ->condition('n.nid', $nids);
      $query
        ->where('c.changed > GREATEST(COALESCE(h.timestamp, :timestamp), :timestamp)', array(
        ':timestamp' => NODE_NEW_LIMIT,
      ));
      $query
        ->condition('c.status', COMMENT_PUBLISHED);
      $query
        ->groupBy('n.nid');
      $result = $query
        ->execute();
      foreach ($result as $node) {
        foreach ($ids[$node->nid] as $id) {
          $values[$id]->{$this->field_alias} = $node->num_comments;
        }
      }
    }
  }
  function render_link($data, $values) {
    if (!empty($this->options['link_to_comment']) && $data !== NULL && $data !== '') {
      $node = entity_create('node', array(
        'nid' => $this
          ->get_value($values, 'nid'),
        'type' => $this
          ->get_value($values, 'type'),
      ));
      $this->options['alter']['make_link'] = TRUE;
      $this->options['alter']['path'] = 'node/' . $node->nid;
      $this->options['alter']['query'] = comment_new_page_count($this
        ->get_value($values, 'comment_count'), $this
        ->get_value($values), $node);
      $this->options['alter']['fragment'] = 'new';
    }
    return $data;
  }
  function render($values) {
    $value = $this
      ->get_value($values);
    if (!empty($value)) {
      return $this
        ->render_link(parent::render($values), $values);
    }
    else {
      $this->options['alter']['make_link'] = FALSE;
    }
  }

}