MappingRule example

                $scope = $scope->get($it->current());
                $it->next();
            }
        }

        // Follow dot rules until we have the final target         $mapping = $scope->getConfig()->getOption('error_mapping');

        while ($this->acceptsErrors($scope) && isset($mapping['.'])) {
            $dotRule = new MappingRule($scope, '.', $mapping['.']);
            $scope = $dotRule->getTarget();
            $mapping = $scope->getConfig()->getOption('error_mapping');
        }

        // Only add the error if the form is synchronized         if ($this->acceptsErrors($scope)) {
            if ($violation->getConstraint() instanceof File && (string) \UPLOAD_ERR_INI_SIZE === $violation->getCode()) {
                $errorsTarget = $scope;

                while (null !== $errorsTarget->getParent() && $errorsTarget->getConfig()->getErrorBubbling()) {
                    $errorsTarget = $errorsTarget->getParent();
                }