commerce_giftcard.module

<?php

/**
 * @file
 * Primary module hooks for Commerce Gift Card module.
 */

use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\BaseFieldDefinition;

/**
 * Implements hook_entity_base_field_info().
 */
function commerce_giftcard_entity_base_field_info(EntityTypeInterface $entity_type) {
  if ($entity_type->id() == 'commerce_order') {
    $fields['commerce_giftcards'] = BaseFieldDefinition::create('entity_reference')
      ->setLabel(t('Giftcards'))
      ->setDescription(t('Giftcards which have been applied to order.'))
      ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED)
      ->setRequired(FALSE)
      ->setSetting('target_type', 'commerce_giftcard')
      ->setSetting('handler', 'default')
      ->setTranslatable(FALSE)
      ->addConstraint('GiftcardOrderCurrency')
      ->setDisplayOptions('form', [
        'type' => 'entity_reference_autocomplete',
        'weight' => 5,
        'settings' => [
          'match_operator' => 'CONTAINS',
          'size' => '60',
          'autocomplete_type' => 'tags',
          'placeholder' => '',
        ],
      ]);

    return $fields;
  }
}