Symfony Fieldset form type

fieldset.html.twig

{% block fieldset_row %}
    <fieldset {{ block('widget_container_attributes') }}>
        <legend{% if label_attr %}{% with { attr: label_attr } %}{{ block('attributes') }}{% endwith %}{% endif %}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}</legend>
        {%- if form.parent is empty -%}
            {{ form_errors(form) }}
        {%- endif -%}
        {{- block('form_rows') -}}
        {{- form_rest(form) -}}
    </fieldset>
{% endblock %}

FieldsetType.php

<?php

use Symfony\Component\Form\AbstractType;
use Symfony\Component\OptionsResolver\OptionsResolver;

class FieldsetType extends AbstractType
{
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefault('inherit_data', true);
    }

    public function getBlockPrefix()
    {
        return 'fieldset';
    }
}