Symfony twig how to add class to a form row

Question

I am building a project in Symfony 2.3 using Twig. I want to add a class to the form row block. I am using a form theme file which contains:

{% block form_ro         


        

Answer 1

Docs say: you always able to pass attr to rendered element:

{{ form_start(form, {'attr': {'class': 'your-class'}} ) }}
    {{ form_label(form, {'attr': {'class': 'your-class'}}) }}
    {{ form_widget(form, {'attr': {'class': 'your-class'}}) }}
    {{ form_errors(form, {'attr': {'class': 'your-class'}}) }}
{{ form_end(form) }}