DataTransformerConfigurationsFeaturesTransformer.php

<?php
namespace Lynux\CoreBundle\Form\DataTransformer;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;

use Lynux\AssetBundle\Entity\Core\Codes;
use Lynux\AssetBundle\Entity\Core\ConfigurationsFeatures;

class ConfigurationsFeaturesTransformer implements DataTransformerInterface
{
    private $objectManager;

    public function __construct(ObjectManager $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    // transform submitted ArrayCollection of Core\Codes
    // into ArrayCollection of Core\ConfigurationsFeatures
    public function transform(ArrayCollection $codes)
    {
        $features = new ArrayCollection();

        foreach($codes as $code) {
            $feature = new ConfigurationsFeatures();
            $feature->setFeatureFk($code);
            $features->add($feature);
        }

        return $features;
    }

    // transform provided ArrayCollection of Core\ConfigurationsFeatures
    // into array for form
    public function reverseTransform(ArrayCollection $features)
    {
        return $features->toArray();
    }
}