function changed_fields_entity_presave in Changed Fields API 8.3

Implements hook_entity_presave().

File

examples/changed_fields_basic_usage/changed_fields_basic_usage.module, line 16

This is the Changed Fields Basic Usage example module.

Code

function changed_fields_entity_presave(EntityInterface $entity) {
  if ($entity instanceof ContentEntityInterface) {

    // Create EntitySubject object that will check entity fields
    // by DefaultFieldComparator.
    $entity_subject = new EntitySubject($entity);

    // Add your observer object to EntitySubject.
    $entity_subject
      ->attach(new BasicUsageObserver());

    // Check if entity fields have been changed.
    $entity_subject
      ->notify();
  }
}