/**
  * @ApiDoc(
  *     section="Messaging",
  *     description="Start a conversation wich a user",
  *     input="MessageBundle\Model\Conversation",
  *     statusCodes={
  *         201 = "Created",
  *     },
  * )
  * @Method("POST")
  * @Route("/users/{user}/conversations")
  * @param PersonInterface $user
  * @param InputConversationInterface $conversation
  * @param ConstraintViolationListInterface $validationErrors
  * @ParamConverter(name="conversation", converter="fos_rest.request_body", class="MessageBundle\Model\Conversation")
  * @ParamConverter(name="user", class="UserBundle:User", converter="doctrine.orm")
  * @View(statusCode=201)
  */
 public function startConversationAction(PersonInterface $user, InputConversationInterface $conversation, ConstraintViolationListInterface $validationErrors)
 {
     if (count($validationErrors) > 0) {
         throw new ConstraintViolationBadRequestException($validationErrors);
     }
     $this->sender->startConversation($this->getSender(), $user, $conversation->getBody(), $conversation->getSubject());
 }