comment.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Comment module.
 */
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\field\Entity\FieldStorageConfig;

/**
 * Implements hook_uninstall().
 */
function comment_uninstall() {

  // Remove the comment fields.
  $storage = \Drupal::entityTypeManager()
    ->getStorage('field_storage_config');
  $fields = $storage
    ->loadByProperties([
    'type' => 'comment',
  ]);
  $storage
    ->delete($fields);

  // Remove state setting.
  \Drupal::state()
    ->delete('comment.node_comment_statistics_scale');
}

/**
 * Implements hook_install().
 */
function comment_install() {

  // By default, maintain entity statistics for comments.
  // @see \Drupal\comment\CommentStatisticsInterface
  \Drupal::state()
    ->set('comment.maintain_entity_statistics', TRUE);
}

/**
 * Implements hook_schema().
 */
function comment_schema() {
  $schema['comment_entity_statistics'] = [
    'description' => 'Maintains statistics of entity and comments posts to show "new" and "updated" flags.',
    'fields' => [
      'entity_id' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The entity_id of the entity for which the statistics are compiled.',
      ],
      'entity_type' => [
        'type' => 'varchar_ascii',
        'not null' => TRUE,
        'default' => 'node',
        'length' => EntityTypeInterface::ID_MAX_LENGTH,
        'description' => 'The entity_type of the entity to which this comment is a reply.',
      ],
      'field_name' => [
        'type' => 'varchar_ascii',
        'not null' => TRUE,
        'default' => '',
        'length' => FieldStorageConfig::NAME_MAX_LENGTH,
        'description' => 'The field_name of the field that was used to add this comment.',
      ],
      'cid' => [
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {comment}.cid of the last comment.',
      ],
      'last_comment_timestamp' => [
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The Unix timestamp of the last comment that was posted within this node, from {comment}.changed.',
        'size' => 'big',
      ],
      'last_comment_name' => [
        'type' => 'varchar',
        'length' => 60,
        'not null' => FALSE,
        'description' => 'The name of the latest author to post a comment on this node, from {comment}.name.',
      ],
      'last_comment_uid' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The user ID of the latest author to post a comment on this node, from {comment}.uid.',
      ],
      'comment_count' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The total number of comments on this entity.',
      ],
    ],
    'primary key' => [
      'entity_id',
      'entity_type',
      'field_name',
    ],
    'indexes' => [
      'last_comment_timestamp' => [
        'last_comment_timestamp',
      ],
      'comment_count' => [
        'comment_count',
      ],
      'last_comment_uid' => [
        'last_comment_uid',
      ],
    ],
    'foreign keys' => [
      'last_comment_author' => [
        'table' => 'users',
        'columns' => [
          'last_comment_uid' => 'uid',
        ],
      ],
    ],
  ];
  return $schema;
}

/**
 * Implements hook_update_last_removed().
 */
function comment_update_last_removed() {
  return 8701;
}

/**
 * Remove the year 2038 date limitation.
 */
function comment_update_10100(&$sandbox = NULL) {
  $connection = \Drupal::database();
  if ($connection
    ->schema()
    ->tableExists('comment_entity_statistics') && $connection
    ->databaseType() != 'sqlite') {
    $new = [
      'type' => 'int',
      'not null' => TRUE,
      'default' => 0,
      'description' => 'The Unix timestamp of the last comment that was posted within this node, from {comment}.changed.',
      'size' => 'big',
    ];
    $connection
      ->schema()
      ->changeField('comment_entity_statistics', 'last_comment_timestamp', 'last_comment_timestamp', $new);
  }
}