' . t('About') . ''; $output .= '

' . t('TODO') . '

'; return $output; } } /** * Implements hook_ENTITY_TYPE_presave() for node entities. */ function pe_course_node_presave(EntityInterface $node) { pe_course_build_book($node); } /** * Create book for course. * * @param \Drupal\Core\Entity\EntityInterface $entity */ function pe_course_build_book(EntityInterface $entity) { if ($entity->bundle() == NODE_TYPE_COURSE) { if (empty($entity->get('field_course_book')->target_id)) { $node = Node::create([ 'type' => 'book', 'title' => '[BOOK]: ' . $entity->getTitle(), 'uid' => '1', 'status' => 1, ]); $node->body->generateSampleItems(1); $node->book['bid'] = 'new'; $node->save(); // Update the course book reference field. $entity->field_course_book->target_id = $node->id(); } } }