$entity_types['node']
->setFormClass('book_outline', 'Drupal\book\Form\BookOutlineForm')
->setLinkTemplate('book-outline-form', '/node/{node}/outline')
- ->setLinkTemplate('book-remove-form', '/node/{node}/outline/remove');
+ ->setLinkTemplate('book-remove-form', '/node/{node}/outline/remove')
+ ->addConstraint('BookOutline', []);
}
/**
}
if (!empty($build)) {
- drupal_render($build);
+ \Drupal::service('renderer')->render($build);
}
$variables['has_links'] = FALSE;