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<?php
/**
* Implements hook_uninstall().
*/
function chapters_uninstall() {
// Load services.
$queryFactory = \Drupal::service('entity.query');
$nodeStorage = \Drupal::entityManager()->getStorage('node');
// Query all entity.
$query = $queryFactory->get('node')
// <-- replace event in below line with your content type machine name
->condition('type', 'student_chapter');
$nids = $query->execute();
// Delete entities.
if (!empty($nids)) {
$entities = $nodeStorage->loadMultiple($nids);
$nodeStorage->delete($entities);
}
}
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