Los cambios se aplican inmediatamente.
{{ form_start(form) }}
{{ form_label(form.nombre) }}
{{ form_widget(form.nombre, {'attr': {'class': 'form-control'}}) }}
{{ form_errors(form.nombre) }}
{{ form_label(form.apellidos) }}
{{ form_widget(form.apellidos, {'attr': {'class': 'form-control'}}) }}
{{ form_errors(form.apellidos) }}
{{ form_label(form.email) }}
{{ form_widget(form.email, {'attr': {'class': 'form-control'}}) }}
{{ form_errors(form.email) }}
{{ form_label(form.telefono) }}
{{ form_widget(form.telefono, {'attr': {'class': 'form-control'}}) }}
{{ form_errors(form.telefono) }}
{{ form_end(form) }}