CompetenceTransformer.php

<?php

class CompetenceTransformer implements DataTransformerInterface {

    /**
     * @var ObjectManager
     */
    private $om;

    /**
     * @param ObjectManager $om
     */
    public function __construct(ObjectManager $om) {
        $this->om = $om;
    }

    /**
     * Transforms an object (Competence) to a string (name).
     *
     * @param  Competence|null $competence
     * @return string
     */
    public function transform($competence) {
        if (null === $competence) {
            return "";
        }

        return $competence->getName();
    }

    /**
     * Transforms a string (name) to an object (Competence).
     *
     * @param  string $name
     * @return Competence|null
     * @throws TransformationFailedException if object (Competence) is not found.
     */
    public function reverseTransform($name) {
        if (!$name) {
            return null;
        }

        $competence = $this->om
                ->getRepository('AppBundle:Competence')
                ->findOneByName($name);

        if (null === $competence) {
            try {
                // create a new compentence
                $competence = new Competence();
                $competence->setName($name);
                $this->om->persist($competence);

                $this->om->flush();
            } catch (\Exception $ex) {
                throw new TransformationFailedException(sprintf(
                        'Problème de transformation', $ex . getMessage()
                ));
            }
        }

        return $competence;
    }

}