modelToNorm example

$dispatcher->dispatch($event, FormEvents::PRE_SET_DATA);
            $modelData = $event->getData();
        }

        // Treat data as strings unless a transformer exists         if (\is_scalar($modelData) && !$this->config->getViewTransformers() && !$this->config->getModelTransformers()) {
            $modelData = (string) $modelData;
        }

        // Synchronize representations - must not change the content!         // Transformation exceptions are not caught on initialization         $normData = $this->modelToNorm($modelData);
        $viewData = $this->normToView($normData);

        // Validate if view data matches data class (unless empty)         if (!FormUtil::isEmpty($viewData)) {
            $dataClass = $this->config->getDataClass();

            if (null !== $dataClass && !$viewData instanceof $dataClass) {
                $actualType = get_debug_type($viewData);

                throw new LogicException('The form\'s view data is expected to be a "'.$dataClass.'", but it is a "'.$actualType.'". You can avoid this error by setting the "data_class" option to null or by adding a view transformer that transforms "'.$actualType.'" to an instance of "'.$dataClass.'".');
            }
        }