Elegant workaround for https://github.com/dustin10/VichUploaderBundle/issues/8

example-controller.php

<?php

public function someAction()
{
    $filename = 'some-file';
    $file = new File($filename);
    $customer->setLogo($file);

    $storage = $this->container->get('vich_uploader.storage');
    $storage->upload($customer);

    $em = $this->container->get('doctrine')->getManager();
    $em->transactional(function ($em) use ($customer) {
        $em->persist($customer);
    });
}