I want to do something when a node gets updated. To keep it simple, lets say display a drupal message.


    path: /node/{node}
        _controller: Drupal\hello_world\Controller\HelloWorldController::hello_world_entity_update
        _permission: 'access content'

Not sure if the path should be /node/{node}/edit instead.


 * @file
 * Contains \Drupal\hello_world\Controller\HelloController.

namespace Drupal\hello_world\Controller;

use Drupal\Core\Controller\ControllerBase;

class HelloWorldController extends ControllerBase {

  public function hello_world_entity_update(Drupal\Core\Entity\EntityInterface $entity) { 
    drupal_set_message(t('Something @var just happened.', array('@var' => 'cool')));  

Since hook_node_update() was depreciated, I assume we now have to use hook_entity_update().

I am not getting the message upon updating a node, what I'm I missing or doing wrong?


Just so I don't confuse anyone. I was brainwashed into thinking I needed a routing file and a controller. All the D8 examples out there use them.

Since I was not creating any pages, turns out I did not need a routing.yml file nor a Controller.php file nor the /src folder. All I had to do is approach this like Drupal 7, all that I needed was the .info.yml file and a .module file to put the hook.

  • 1
    You have to put hook_entity_update() in helloword.module. This does not work as a controller.
    – 4k4
    May 10 '16 at 9:22
  • Thank you for the disclaimer at the end. I'm a D7 veteran but new to D8 and I'm still trying to figure out when to use the OOP structure... all the documentation says how to use it, but not when...
    – Keven
    Feb 9 '19 at 20:42

Hooks are still implemented as global, procedural functions; you need to declare them in the .module file just like Drupal 7, not in a controller class:

function MYMODULE_entity_update(Drupal\Core\Entity\EntityInterface $entity) {
  // ...

The system will move to OO in Drupal 9.

It's also worth noting that hook_ENTITY_TYPE_update() also exists, so you can still use hook_node_update():

function MYMODULE_node_update(Drupal\node\NodeInterface $node) {
  // ...
  • interesting, then what should I put in my controller? controllers are not mandatory?
    – No Sssweat
    May 10 '16 at 9:30
  • 1
    Typically a controller is linked up to a route, so they're generally used for building the markup (render array) for a page
    – Clive
    May 10 '16 at 9:32
  • so they're generally used for building the markup (render array) for a page since I am not building a page, leave the controller class empty? or delete it all together?
    – No Sssweat
    May 10 '16 at 9:34
  • Are you thinking a module requires a controller? It doesn't, so unless you need it for something (essentially building a page), just remove the file
    – Clive
    May 10 '16 at 9:35
  • according to this I need to have something for defaults: in my hello_world.rounting.yml, so what should I use instead? _entity_form?
    – No Sssweat
    May 10 '16 at 9:47
  1. You need not define any controller for this .
  2. Write this code in your custom .module file.

use Drupal\Core\Entity\EntityInterface;

 function module_name_entity_update(EntityInterface $entity) { 

    drupal_set_message(t('Something @var just happened.', array('@var' => 'cool')));  

  • Does this hook get invoked when ie. a comment is added with ajax ie. ajax_comments module which uses ajax to add comments.
    – Sigma
    Mar 1 '19 at 6:52

There are lots of hooks are available for node.

You can inherit in template.php file and write down your code.

you can use hook_node_update in template.php

  • hooks should be used in .module files and not in template.php. Maybe you're confusing them with function template_something. Ex: template_preprocess_node which goes in your template.php file.
    – No Sssweat
    May 11 '16 at 3:13

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