Re-save all nodes of a particular type in an update hook in Drupal 8

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I recently needed to re-save all the nodes of a particular content type (after I had added some fields and default configuration) as part of a Drupal 8 site update and deployment. I could go in after deploying the new code and configuration, and manually re-save all content using the built-in bulk operation available on the /admin/content page, but that would not be ideal, because there would be a period of time where the content isn't updated on the live siteā€”plus, manual processes are fragile and prone to failure, so I avoid them at all costs.

In my Drupal 8 module, called custom, I added the following update hook, inside custom.install:

<?php
// Add this line at the top of the .install file.
use Drupal\node\Entity\Node;/**
* Re-save all Article content.
*/
function custom_update_8002() {
// Get an array of all 'article' node ids.
$article_nids = \Drupal::entityQuery('node')
->
condition('type', 'article')
->
execute();// Load all the articles.
$articles = Node::loadMultiple($article_nids);
foreach (
$articles as $article) {
$article->save();
}
}
?>

Though Drupal 8's configuration management system allows almost any config changes to be made without update hooks nowadays... I find I still need to use update hooks on many sites to deploy updates that affect the way a theme or a view displays content on the site (especially when adding new fields to existing content types).

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