function book_node_presave

Implements hook_ENTITY_TYPE_presave() for node entities.

File

core/modules/book/book.module, line 253

Code

function book_node_presave(EntityInterface $node) {
    // Make sure a new node gets a new menu link.
    if ($node->isNew()) {
        $node->book['nid'] = NULL;
    }
}