Drupal 8.8
Modules: Metatags & Migration plus.

I am trying to convert a tag in an XML file to an open graph image metatag.

File: modules/custom/my_module/dataxml.html
This is the url that has to be converted to the image metatag.


File: modules/custom/my_module/config/install/migrate_plus.migration.content.yml
These are the source field for the required metatag.

     - name: og_image_url
       label: Image
       selector: ImageUrl

Process for the required metatag

    source: og_image_url
    plugin: prepare_meta

File: modules/custom/my_module/src/Plugin/migrate/process/PrepareMeta.php
The plugin links the metatag with the required value and serializes the mapped result


namespace Drupal\my_module\Plugin\migrate\process;

use Drupal\migrate\MigrateExecutableInterface;
use Drupal\migrate\ProcessPluginBase;
use Drupal\migrate\Row;

 * Plugin to prepare the meta tags.
 * @MigrateProcessPlugin(
 *   id = "prepare_meta",
 * )
class PrepareMeta extends ProcessPluginBase {

   * {@inheritdoc}
  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
    $metas = [];

    // This should likely work with an array later on, but for now, it'll do.
    if (!empty($value)) {
      $metas[$this->configuration['source']] = $value;

    return $metas ? serialize($metas) : [];

When I run xDebug $metas has the following value:
$metas = [ og_image_url => "https://via.placeholder.com/300.jpg/09f/fff" ];

The node is created and the other field are migrated perfectly. However the metatag field og:image:url remains empty and doesn't trigger an error. I don't really know what I'm doing wrong here. If someone could point me in the right direction, that would be much appreciated.

1 Answer 1


Turns out I used the wrong field name. My field is called field_meta_tag instead of field_meta_tags as used in the question above.

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