My team is working on a simple message notification using the message stack but a bit tricky to implement.

The goal is when a user is subscribed to content, a notification message will be delivered to the user's email address.

We are trying to follow this steps, doing the configuration in the browser. But the last step, we think should be added manually in a certain file as mentioned in this comment.


  • Where should I add the code to properly send the message into email?
  • Is there a need to create a custom module to achieve it?
  • In D7 this would be a peace of cake (using the Message stack, combined with Rules, and zero custom code). Sure you want to do this in D8? – Pierre.Vriens Jan 11 '18 at 9:14
  • Where should I add the code to properly send the message into email? Depends of when you would like to send the notification message. When a node is updated? When a new node is created? or both? – No Sssweat Jan 11 '18 at 10:08
  • Yes, our site is running in D8. – John Rey Tanquinco Jan 12 '18 at 0:50
  • @NoSssweat Its either, updated, created or both. Can you site one example, im not very sure which file I will append it. – John Rey Tanquinco Jan 12 '18 at 1:38

Hooks go in the .module file, the only hooks that can also work in the .theme file are preprocess and alter hooks.

So if you want the message to be sent when a node is created or updated, use hook_ENTITY_TYPE_presave.

Create a custom module, lets call it "Send Message"


name: 'Send Message'
description: 'Sends the message when a node of Content type Article is created or updated.'
core: 8.x
package: Message
  - message
type: module



use Drupal\node\NodeInterface;
use Drupal\message\Entity\Message;

 * Implements hook_ENTITY_TYPE_presave()

function send_message_node_presave(NodeInterface $node) {

   if ($node->getType() == 'article') { // checks if content type is article
      $message = Message::create(['template' => 'foo_message_type', 'uid' => $node->getOwnerId()]);
      $message->set('field_node_ref', $node);
      $notifier = \Drupal::service('message_notify.sender');

| improve this answer | |
  • Thank you for a very detailed response will try that and accept the answer once working. – John Rey Tanquinco Jan 12 '18 at 4:30
  • Getting this error message TypeError: Argument 1 passed to Drupal\message_notify\MessageNotifier::send() must be an instance of Drupal\message\MessageInterface, string given, called in /opt/app-root/src/modules/custom/send_message/send_message.module on line 14 in Drupal\message_notify\MessageNotifier->send() (line 48 of modules/message_notify/src/MessageNotifier.php). – John Rey Tanquinco Jan 12 '18 at 5:21
  • seems like it doesnt need to be a string – John Rey Tanquinco Jan 12 '18 at 5:25
  • As per drupal.org/node/2180171 looks like you need to create a message of some template type. – No Sssweat Jan 12 '18 at 5:31
  • 1
    @NoSssweat don' be surprised if some day (soon?) a competing answer using D8Rules will be added by "somebody" ... – Pierre.Vriens Jan 12 '18 at 9:13

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