--- /dev/null
+<?php
+
+namespace Drupal\migrate_drupal\Plugin\migrate\field;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * @MigrateField(
+ * id = "userreference",
+ * core = {6},
+ * type_map = {
+ * "userreference" = "entity_reference",
+ * },
+ * )
+ */
+class UserReference extends FieldPluginBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFieldFormatterMap() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
+ $process = [
+ 'plugin' => 'iterator',
+ 'source' => $field_name,
+ 'process' => [
+ 'target_id' => [
+ 'plugin' => 'migration_lookup',
+ 'migration' => 'd6_user',
+ 'source' => 'uid',
+ ],
+ ],
+ ];
+ $migration->setProcessOfProperty($field_name, $process);
+ }
+
+}