/*
 * @var string
 *
 * @ORMColumn(name="question", type="text", nullable=false)
 *
 * @Groups({"list", "details", "exercise_details"})
 * @Type("string")
 */

private $question;

$exercise = $exerciseRepo->findOneBy(array('id' => $id));
$this->response(json_decode($this->serializer->serialize($exercise, 'json', JMSSerializerSerializationContext::create()->setGroups(array('exercise_details', 'details')));

charset: UTF8

dbal:
        driver:   %database_driver%
        host:     %database_host%
        port:     %database_port%
        dbname:   %database_name%
        user:     %database_user%
        password: %database_password%
        charset:  UTF8