Bolt\Storage\Field\Type\TemplateFieldsType::__construct PHP Метод

    public function __construct(array $mapping = [], EntityManager $em, TemplateChooser $chooser = null)
    {
        $this->mapping = $mapping;
        $this->chooser = $chooser;
        $this->em = $em;
        if ($em) {
            $this->setPlatform($em->createQueryBuilder()->getConnection()->getDatabasePlatform());
        }
    }