NcsLastCommentName.php

1. 8.x drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NcsLastCommentName.php
2. 8.x drupal/core/modules/comment/lib/Drupal/comment/Plugin/views/sort/NcsLastCommentName.php

<?php

/**
 * @file
 * Definition of Drupal\comment\Plugin\views\sort\NcsLastCommentName.
 */
namespace Drupal\comment\Plugin\views\sort;

use Drupal\views\Plugin\views\sort\SortPluginBase;
use Drupal\Component\Annotation\PluginID;

/**
 * Sort handler to sort by last comment name which might be in 2 different
 * fields.
 *
 * @ingroup views_sort_handlers
 *
 * @PluginID("comment_ncs_last_comment_name")
 */
class NcsLastCommentName extends SortPluginBase {
  public function query() {
    $this
      ->ensureMyTable();
    $definition = array(
      'table' => 'users',
      'field' => 'uid',
      'left_table' => $this->tableAlias,
      'left_field' => 'last_comment_uid',
    );
    $join = drupal_container()
      ->get('plugin.manager.views.join')
      ->createInstance('standard', $definition);

    // @todo this might be safer if we had an ensure_relationship rather than guessing
    // the table alias. Though if we did that we'd be guessing the relationship name
    // so that doesn't matter that much.
    $this->user_table = $this->query
      ->ensure_table('ncs_users', $this->relationship, $join);
    $this->user_field = $this->query
      ->addField($this->user_table, 'name');

    // Add the field.
    $this->query
      ->addOrderBy(NULL, "LOWER(COALESCE({$this->user_table}.name, {$this->tableAlias}.{$this->field}))", $this->options['order'], $this->tableAlias . '_' . $this->field);
  }

}