Modify the node title with the node ID before saving it

Question

I need to modify the node title while saving the node ID. I implemented hook_form_FORM_ID_alter() as follows.

/**
 * Implements hook_form_FORM_ID_alter()
 */
function module_name_form_form_id_alter(&$form, FormStateInterface $form_state, $form_id) {
  $form['title']['#access'] = FALSE;
  $form['#entity_builders'][] = 'change_node_title';   
}

function change_node_title($entity_type, NodeInterface $node, $form, FormStateInterface $form_state) {
  $node_id = $node->nid->value; // Not getting the node details
  $node->setTitle('Custom Title -' . $node_id);
}

The node details aren't found from the #entity_builders callback.

How can modify the node title before saving it? I don't want to use any custom modules for this. I don't want to use hook_node_presave() either, as it would affect the cloned nodes.

Answer 1

Never tried entity_buildres but you could probably use the old and tried way of adding a submit handler

function MODULENAME_form_alter(&$form, &$form_state, $form_id) { 
  // this is the create form id, edit form would be node_article_edit_form
  if($form_id == 'node_article_form') {
    $form['actions']['submit']['#submit'][] = 'MODULENAME_change_title';
  }   
}

function MODULENAME_change_title($form, $form_state) {
  $node = $form_state->getFormObject()->getEntity();
  $node->setTitle('Custom Title - ' . $node->id());
  $node->save();
}

Answer 2

I would advice to use hook_entity_presave() for this:

/**
 * Implements hook_ENTITY_TYPE_presave().
 */
function MYMODULE_entity_presave(Drupal\Core\Entity\EntityInterface $entity) {
  // save a different value as title
  if ($entity->bundle() == 'NODE_TYPE') {
    $entity->title = 'Custom Title - ' . $entity->id();
  }
}