How to embed a node's NID in the title of a node?

Question

I know the Automatic Nodetitles module exists, but it is only for Drupal 7.

Is there a method of automatically assigning the title with the NID upon clicking submit? I know that the NID doesn't exist until the submit button is hit. How would one embed the NID in the title?

What hook would one use?

Answer 1

You need to do two step:

Step one: auto generate the title and hidden form. use hook_field_widget_form_alter() with code

function MY_MODULE_field_widget_form_alter(&$element, \Drupal\Core\Form\FormStateInterface $form_state, $context) {
  $field_definition = $context['items']->getFieldDefinition();
  $bundle = $form_state->getFormObject()->getEntity()->bundle();
  // You can check with other bundle
  if ($field_definition->getName() == 'title' && $bundle == 'page' && $element['value']['#default_value'] == '') {
    $element['#required'] = FALSE;
    //hidden title  
    $element['#type'] = 'hidden';
    $element['value']['#required'] = FALSE;
    // Set default value
    $element['value']['#default_value'] = 'Default Title';
  }
}

with step one you can cross submit form.

Step two: Override new title with default value. Use hook_node_insert()

function MY_MODULE_node_insert(Drupal\node\NodeInterface $node) {
  if ($node->bundle() == 'page') {
    $new_title = 'New title ' . $node->id();
    $node->setTitle($new_title);
    $node->setNewRevision(FALSE);
    $node->save();  
  }
}

Answer 2

You can use the Hook Post Action module

So this module introduces several new Drupal hooks to overcome this limitation

• hook_entity_postsave
• hook_entity_postinsert
• hook_entity_postupdate
• hook_entity_postdelete
• hook_node_postsave
• hook_node_postinsert
• hook_node_postupdate
• hook_node_postdelete

and one you have it installed you can use the hook_node_postsave() hook

In the Automatic Nodetitles module page says:

Be advised that there is a better maintained alternative available: https://www.drupal.org/project/auto_entitylabel

Answer 3

This may be an old issue, but here's my take. Let's say you need this for node add article.

<?php

use Drupal\Core\Form\FormStateInterface;
use Drupal\node\NodeInterface;

function MYMODULE_form_node_article_form_alter(&$form, FormStateInterface $form_state, $form_id) {

    // Hide title field to avoid confusion
    $form['title']['#access'] = FALSE;
    // Set a temporary title because it's always required on node save.
    $form['title']['widget'][0]['value']['#default_value'] = 'Dummy title';

}

function MYMODULE_node_insert(NodeInterface $node) {
  if ($node->bundle() == 'article') {
    $new_title = 'Title ' . $node->id();
    $node->setTitle($new_title);
    $node->setNewRevision(FALSE);
    $node->save();
  }
}