Issue #3310801 by bojan_dev, m.stenta, e0ipso, KenowaX, Berdir: Add client_id...

 * Set uuid as client_id for existing consumers.

 */

function consumers_update_8109() {

  $consumers = \Drupal::entityTypeManager()->getStorage('consumer')->loadMultiple();

  foreach ($consumers as $consumer) {

    $consumer->set('client_id', $consumer->uuid());

    $consumer->save();

  $database = \Drupal::database();

  $query = $database->select('consumer', 'c')

    ->fields('c', ['id', 'uuid']);

  $results = $query->execute()->fetchAllKeyed();

  foreach ($results as $consumer_id => $consumer_uuid) {

    $database->update('consumer_field_data')

      ->fields(['client_id' => $consumer_uuid])

      ->condition('id', $consumer_id)

      ->execute();

  }

}