TaxonomyTermReference.php

<?php

namespace Drupal\taxonomy\Plugin\migrate\cckfield;

@trigger_error('TaxonomyTermReference is deprecated in Drupal 8.4.x and will be removed before Drupal 9.0.x. Use \\Drupal\\taxonomy\\Plugin\\migrate\\field\\TaxonomyTermReference instead.', E_USER_DEPRECATED);
use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate_drupal\Plugin\migrate\cckfield\CckFieldPluginBase;

/**
 * @MigrateCckField(
 *   id = "taxonomy_term_reference",
 *   type_map = {
 *     "taxonomy_term_reference" = "entity_reference"
 *   },
 *   core = {6,7},
 *   source_module = "taxonomy",
 *   destination_module = "core",
 * )
 *
 * @deprecated in drupal:8.4.0 and is removed from drupal:9.0.0. Use
 * \Drupal\taxonomy\Plugin\migrate\field\TaxonomyTermReference instead.
 *
 * @see https://www.drupal.org/node/2751897
 */
class TaxonomyTermReference extends CckFieldPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function processCckFieldValues(MigrationInterface $migration, $field_name, $data) {
        $process = [
            'plugin' => 'sub_process',
            'source' => $field_name,
            'process' => [
                'target_id' => 'tid',
            ],
        ];
        $migration->setProcessOfProperty($field_name, $process);
    }

}