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How can I get Average of a comment field by node_id?

I have Comments here wherein user can rate a content.

I want to get the average rating per content, how do I efficiently get the average?

I have the following code to get the Average:

$cids = Drupal::entityQuery('comment')     ->condition('entity_id', $variables['row']->nid)     ->condition('entity_type', 'node')     ->condition('comment_type', 'content_rating')     ->execute();  $comments = [];  $totalRating = 0;  if ($cids) {     foreach ($cids as $cid) {         $comment = Comment::load($cid);         $comments[] = $comment->get('field_rating')->value;     }      $totRating = array_sum($comments) / count( $comments );      $totalRating = ceil($totRating); }

I know this is not efficient because I’m getting ALL the comments and manually computing for the average rating.

How can I get the average rating on a query level?

This article was republished from its original source.
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How can I get Average of a comment field by node_id?

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