<?php
// app/AppKernel.php
public function registerBundles()
{
    $bundles = array(
        // ...
        new Vich\UploaderBundle\VichUploaderBundle(),
        // ...
    );
}

<?php

namespace VichUploaderDemoBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Vich\UploaderBundle\Mapping\Annotation as Vich;

/**
 * @ORM\Entity
 * @Vich\Uploadable <== クラスに対するコメントにおいてアノテーションをつけます
 */
class Product
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="string")
     */
    protected $title;

    /**
     * @Vich\UploadableField(mapping="product_image", fileNameProperty="imageName")
     *   `mapping` は app/config/config.yml で設定した vich_uploader.mappings 配下のラベル
     *   `fileNameProperty` は 当エンティティ内のファイル名を保持するプロパティ名です。
     */
    protected $imageFile;

    /**
     * @ORM\Column(type="string", length=255, name="image_name")
     */
    protected $imageName;  // <== これが $imageFile のアノテーションで指定されている

    public function getId()
    {
        return $this->id;
    }

    public function getTitle()
    {
        return $this->title;
    }

    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    public function setImageFile(File $image = null)
    {
        $this->imageFile = $image;

        return $this;
    }

    public function getImageFile()
    {
        return $this->imageFile;
    }

    public function setImageName($imageName)
    {
        $this->imageName = $imageName;

        return $this;
    }

    public function getImageName()
    {
        return $this->imageName;
    }
}

<?php

namespace VichUploaderDemoBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

class ProductType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('title','text')
            ->add('imageFile','file') // <== 第1引数は Product エンティティにおいて UploadableField アノテーションが付与されているプロパティ
            ->add('save','submit', ['label' => '更新'])
        ;
    }

    public function getName()
    {
        return 'product_image';
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults([
            'data_class' => '\VichUploaderDemoBundle\Entity\Product',
        ]);
    }
}

<?php

namespace VichUploaderDemoBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use VichUploaderDemoBundle\Entity\Product;
use VichUploaderDemoBundle\Form\ProductType;

/**
 * Class ProductController
 *
 * @Route("/products")
 * @package VichUploaderDemoBundle\Controller
 */
class ProductController extends Controller
{
    /**
     * @Route(
     *      "/new",
     *      name="product_form"
     * )
     * @Method({"GET"})
     * @Template()
     * @return array
     */
    public function newAction()
    {
        $form = $this->createForm(new ProductType(), null, ['method' => 'POST']);

        return [
            'form' => $form->createView(),
        ];
    }

    /**
     * @Route(
     *      "",
     *      name="product_create"
     * )
     * @Method({"POST"})
     * @param Request $request
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     */
    public function createAction(Request $request)
    {
        $product = new Product();
        $form = $this->createForm(new ProductType(), $product);

        $form->handleRequest($request);
        if ($form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($product);
            $em->flush();

            return $this->redirect($this->generateUrl('product_list'));
        }

        return $this->redirect($this->generateUrl('product_form'));
    }

    /**
     * @Route(
     *      "",
     *      name="product_list"
     * )
     * @Method({"GET"})
     * @Template()
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function listAction()
    {
        $products = $this->getDoctrine()->getManager()->getRepository('VichUploaderDemoBundle:Product')->findAll();

        return [
            'products' => $products,
        ];
    }

    /**
     * @Route(
     *      "/{id}",
     *      requirements = {"id" = "\d+"},
     *      name="product_delete"
     * )
     * @Method({"DELETE"})
     * @ParamConverter("product", class="VichUploaderDemoBundle:Product")
     * @param Product $product
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     */
    public function deleteAction(Product $product)
    {
        $em = $this->getDoctrine()->getManager();
        $em->remove($product);
        $em->flush();

        return $this->redirect($this->generateUrl('product_list'));
    }
}

<?php

namespace VichUploaderDemoBundle\Service;

use Symfony\Component\Validator\Constraints\DateTime;
use Vich\UploaderBundle\Mapping\PropertyMapping;
use Vich\UploaderBundle\Naming\DirectoryNamerInterface;

class ProductDirectoryNamer implements DirectoryNamerInterface
{
    public function directoryName($object, PropertyMapping $mapping)
    {
        return 'flower'
    }
}