Score:0

Drupal

Best practice for getting field values of entity chains

mogio

8/26/23, 3:16 PM

I really would like to make this if/else field value check just a little bit more sexy.

What's Best Practice for dealing with nested functions chains to get entity field values (check if they exist / check if they are not empty)

 if($entity->hasField('field_intro_teaser_image_media_')){
      $media_field = $entity->field_intro_teaser_image_media_;

      if($media_field->entity){
        $media_field_entity = $media_field->entity;

        if($media_field_entity->hasField('field_media_image')){
          $media_field_entity_image = $media_field_entity->field_media_image;

          if($media_field_entity_image){
            $media_field_entity_image_entity = $media_field_entity_image->entity;

            if($media_field_entity_image_entity){
              $media_field_entity_image_entity_uri = $media_field_entity_image->entity->getFileUri();

              if($media_field_entity_image_entity_uri){

                // ... yay we got the damn uri!

              }

            }
          }
        }
      }
    }

The one liner would be:

$media_field = $entity->field_intro_teaser_image_media_->entity->field_media_image->entity->getFileUri();

0 + 0

entities

Clive

8/26/23, 3:55 PM

Not tried it on entity fields yet, but [Null-safe operator](https://php.watch/versions/8.0/null-safe-operator)?

Kevin

8/26/23, 4:42 PM

The one liner would fail if anything in the chain does not have the field or relational entity, so you'd want to wrap it in a try catch statement.

4uk4

8/27/23, 7:12 AM

Or use Twig, see https://drupal.stackexchange.com/questions/271579/get-video-url-from-media-entity-reference-field. Twig is null safe by default, if you don't set strict_variables.

Score:1

Drupal

Grzegorz Pietrzak

8/27/23, 6:01 AM

When you access fields by magic methods, you don't actually have to check for their existence by using hasField() method.:

$entity->field_that_does_not_exist->entity; // NULL.
$entity->get('field_that_does_not_exist'); // Exception.
$entity->get('field_that_does_not_exist')->entity; // Exception.

Using $entity->field_intro_teaser_image_media_->entity is sufficient in this case, if the field does not exist, the expression will be simply NULL, without any errors.

But of course you still have to check if referenced ->entity is not NULL. PHP 8.0 Null-safe operator may be a way to do it, as suggested by Clive.

$media_field = $entity
  ->field_intro_teaser_image_media_
  ->entity
  ?->field_media_image
  ->entity
  ?->getFileUri();

In case of using Null-safe operator, it will be probably faster to access entity fields by ->get(), to avoid additional logic.

$media_field = $entity
  ->get('field_intro_teaser_image_media_')
  ?->entity
  ?->get('field_media_image')
  ?->entity
  ?->getFileUri();

0 + 0

mogio

9/17/23, 11:16 AM

thank you . Love the Null Safe Operator. Never used it so far.

Score:1

Drupal

Jaypan

8/26/23, 10:47 PM

Assuming you've built the chain correctly, you can do it as follows:

$media_field = NULL;
try {
  $media_field = $entity->field_intro_teaser_image_media_->entity->field_media_image->entity->getFileUri();
}
catch (\Exception $e) {
  watchdog_exception('Media retrieval');
}

if (!is_null($media_field)) {
  // Do stuff.
}

0 + 0

mogio

9/17/23, 11:17 AM

Thanks. I Did it this way.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Best practice for getting field values of entity chains

TH: แนวทางปฏิบัติที่ดีที่สุดสำหรับการรับค่าฟิลด์ของสายเอนทิตี

RO: Cele mai bune practici pentru obținerea valorilor de câmp ale lanțurilor de entități

VI: Phương pháp hay nhất để nhận giá trị trường của chuỗi thực thể

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