After node update I need to modify a field value in several connected nodes.
As I know, I cannot use hook_entity_update() since $node->save() forms infinite recursion.

How can I modify node fields after a node has been updated? (besides hook_cron)

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    You get an infinite recursion only if you do the node saves in the update hook unconditionally. – 4k4 Aug 23 '20 at 7:30
  • I need to modify a field value in another node in hook_entity_update(). Could you provide a tip what condition can help to stop infinite recursion? – Dimetry Aug 23 '20 at 8:20
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    hook_node_upate already implies the check for the entity type. If you reference a different content type add a check for the content type. If you reference within the same content type then the calculation of the field values could already imply a check, otherwise the recursion is somehow built into your logic. Then it could make sense to refactor the updates to a service which would keep track of the updated nodes. – 4k4 Aug 23 '20 at 8:53

Use hook_form_alter or hook_form_FORM_ID_alter

Add a custom validation that runs after all validation has passed

$form['actions']['submit']['#submit'][] = 'mymodule_update_referenced_nodes';

Then in that function

function mymodule_update_referenced_nodes(&$form, \Drupal\Core\Form\FormStateInterface $form_state){

  $field_other = $form_state->getValue('field_other')[0]['value'];

  $references = $node->get('field_referenced')->referencedEntities();
  foreach ($references as $referenced_node) {
    $referenced_node->field_other->value = $field_other;

  • Thanks. I could have guessed myself. Not universal solution (only for form update). But acceptable for the case. – Dimetry Aug 23 '20 at 7:05
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    @nosssweat, I am wondering why you use validation instead of another submit handler. Don't you have a risk of inconsistencies if saving of the node fails? – Neograph734 Aug 23 '20 at 8:33
  • @Neograph734 actually you're correct, should be put in a submit instead, thanks. – No Sssweat Aug 23 '20 at 10:04
  • @Dimetry updated answer. – No Sssweat Aug 23 '20 at 10:07
  • 1
    @NoSssweat Oke. I was just wondering if doing it in validation had some advantage or something, as I always used submit. Apparently it does not ;) – Neograph734 Aug 23 '20 at 10:11

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