gistfile1.php

<?php

use EPWT\DataMapper\DataMap;
use Symfony\Component\Validator\Constraints as Assert;

class dataMapBooksFullBookInfo extend DataMap
{
  /**
   * @var stirng
   */
  protected $groupName = 'books';
  
  /**
   * @var stirng
   */
  protected $mapname = 'full_book_info';
  
  /**
   * @var stirng
   */
  protected $properties = [
    'title',
    'author',
    'release_data'
  ];
  
  /**
   * @var stirng
   */
  protected $requiredProperties = [
    'title',
    'author'
  ];
  
  public function getAssertCollection()
  {
    return new Assert\Collection(
      [
        'title' => new Assert\NotBlack(),
        'author' => new Assert\NotBlack(),
        'date' => new Assert\NotBlack(),
      ]
    )
  }
}

class dataMapperContainer extend DataMapperContainer
{
  protected $dataMaps = [
    'books.full_book_info' => 'dataMapBooksFullBookInfo' 
  ];
}