Issue #3324607: Cannot import data into field using feeds module

<?php

namespace Drupal\year\Feeds\Target;

use Drupal\Core\Field\FieldDefinitionInterface;

use Drupal\feeds\FieldTargetDefinition;

use Drupal\feeds\Plugin\Type\Target\FieldTargetBase;

/**

 * Defines a year field mapper.

 *

 * @FeedsTarget(

 *   id = "year",

 *   field_types = {"year"}

 * )

 */

class Year extends FieldTargetBase {

  /**

   * {@inheritdoc}

   */

  protected static function prepareTarget(FieldDefinitionInterface $field_definition) {

    $definition = FieldTargetDefinition::createFromFieldDefinition($field_definition)

      ->addProperty('value')

      ->markPropertyUnique('value');

    return $definition;

  }

  /**

   * {@inheritdoc}

   */

  protected function prepareValue($delta, array &$values) {

    $value = is_string($values['value']) ? trim($values['value']) : $values['value'];

    $values['value'] = is_numeric($value) ? (int) $value : '';

  }

}