protected function getMutators(array $fields = null)
    {
        $mutators = [];

        foreach ($fields as $field) {
            if ($field->isAutoManaged()) {
                continue;
            }

            if ($field->isMultipleAnswers()) {
                $content = $this->getStubContent('model-mutator-multiple-answers');
                $this->replaceFieldName($content, $field->name);

                $mutators[] = $this->getMutator($field, $content);
            }

            if ($field->isDateOrTime()) {
                $content = $this->getStubContent('model-mutator-datetime');
                $this->replaceFieldName($content, $field->name);

                $mutators[] = $this->getMutator($field, $content);
            }
        }

        return implode(PHP_EOL, $mutators);
    }