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I'm creating a custom module. This module displays public custom content without node and views . For this content custom page , I would like to add dynamic meta keyword and meta description .

I have read this excellent answer How do I add a meta tag in <head>...</head> section? and it said we can use

mymodulename_page_attachments(&$page) 

and update variable

$page

But the meta contents are getting in a controller's method. For this raison, I would like to pass the meta contents to mymodulename_page_attachments hook.

How can I call and update $page in my controller module to do this ? Or how can I generate meta in my controller ?

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    Move the logic into a service then use the service in both contexts (controller and hook). You can statically cache the results of the op if it’s expensive. Or maybe try attaching html_head to the render array you return from the controller and see if it bubbles up to the page layer (something tells me it will but I’m not sure) – Clive Feb 7 '18 at 9:59
  • tank's I didn't think to this. I will try . – Agriesean Feb 7 '18 at 12:29
  • @Clive than'ks . Your message told me what to do and what to learnt . ^^ – Agriesean Feb 8 '18 at 9:03
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hook_page_attachments() is only needed so you can attach it to any possible route/url. You should be to just add it directly to the response that you re returning, and it should bubble up and be added.

  • thank's to your response . I didn't understood realy what was Drupal Service. It's mistake . :-) – Agriesean Feb 8 '18 at 9:06
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Service was the key to my problem .

After i understood Drupal services https://www.drupal.org/docs/8/api/services-and-dependency-injection/services-and-dependency-injection-in-drupal-8

and

http://valuebound.com/resources/blog/how-to-define-your-own-services-drupal-8

It's easy to define dynamic keyword and meta to one page

function mymodulename_page_attachments(array &$page) {
    $currentUrl = Drupal::request()->get(Symfony\Cmf\Component\Routing\RouteObjectInterface::ROUTE_NAME); 
    switch($currentUrl){
        case 'path_url': 
        //call my service 
          $description = array(
                '#tag' => 'meta',
                '#attributes' => array(
                    'property' => 'description',
                    'content' => /* value to my service return */,
                ),
            );

            $page['#attached']['html_head'][] = [$description, 'description'];
        break;

    }
}

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