/**
  * Create a new assignment.
  *
  * @param AssignmentFormBuilder    $builder
  * @param TypeRepositoryInterface  $types
  * @param FieldRepositoryInterface $fields
  * @param                          $type
  * @return \Symfony\Component\HttpFoundation\Response
  */
 public function create(AssignmentFormBuilder $builder, TypeRepositoryInterface $types, FieldRepositoryInterface $fields, $type)
 {
     /* @var TypeInterface $type */
     $type = $types->find($type);
     return $builder->setField($fields->find($this->request->get('field')))->setStream($type->getEntryStream())->render();
 }