How can I get all comments for a node?

Question

I have have a content type (Stuff) with an entity reference field (comments) for comments (their type is Stuff comments) with a single field (comment_body).

Inside a controller, I loaded a node by its ID.

How do I get the list of all the comments for that node?

Answer 1

To answer my own question I guess(better alternatives are more than welcome).

use Drupal\Core\Entity\EntityTypeManagerInterface;

class SomeRepository {

  /**
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entity_type_manager;

  /**
   * ProductRepository constructor.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->entity_type_manager = $entity_type_manager;
  }

  /**
   * @param $node_id
   *
   * @return array|null
   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
   * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
   */
  public function getNodeComments($node_id) {
    try{
      $node = $this->entity_type_manager
        ->getStorage('node')
        ->load($node_id);
    }catch(\Exception $exception) {
      // log here
      // rethrow error or return, whatever works for you
      return NULL;
    }

    try{
      $comment_ids = $this->entity_type_manager
        ->getStorage('comment')
        ->getQuery('AND')
        ->condition('entity_id', $node->id())
        ->condition('entity_type', 'node')
        ->sort('cid', 'DESC')
        ->execute();
    }catch(\Exception $exception) {
      // log here
      // rethrow error or return, whatever works for you
      return NULL;
    }

    if(empty($comment_ids)) {
      return [];
    }

    $comments = $this->entity_type_manager
      ->getStorage('comment')
      ->loadMultiple($comment_ids);

    $comments_array = [];

    foreach($comments as $comment) {
      // Loop over and get whichever fields you want from the comments
      $comments_array[$comment->id()] = [
        'cid' => $comment->id(),
        'owner_id' => $comment->getOwnerId(), // node to which this comment belongs
        'some_field' => $comment->get('some_field')->value
      ];
    }

    return $comments_array;
  }
}

Answer 2

Assuming the your node is a variable $node:

$entity_manager = \Drupal::entityTypeManager();
  try {
    /** @var \Drupal\comment\CommentStorageInterface $storage */
    $storage = $entity_manager->getStorage('comment');
    /** @var \Drupal\comment\CommentFieldItemList $commentField */
    $commentField = $node->get('comment');
    $comments = $storage->loadThread($node, $commentField->getFieldDefinition()->getName(), \Drupal\comment\CommentManagerInterface::COMMENT_MODE_FLAT);
    if (empty($comments)){
      return;
    }
    /** @var \Drupal\comment\Entity\Comment $comment */
    foreach ($comments as $comment) {
      //Logic here
    }

  } catch (\Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException $e) {
  } catch (\Drupal\Component\Plugin\Exception\PluginNotFoundException $e) {
  }

This will get you all the comments of that node. You can play with the \Drupal\comment\CommentManagerInterface to get a threaded version of the comments.

Answer 3

You can do something like

foreach ($stuff->get('comments')->referencedEntities() as $comment) {
   ..do whatever on entity comment ..
}