{{ form_start(form, {'method': 'post', 'attr' : {'id' : 'formCategory'}}) }}
<div class="form-group">
    <label class="control-label">
        Nom <span class="symbol required"></span>
    </label>
    {{ form_widget(form.name, { 'attr': {'class': 'form-control', 'required' : 'true' }}) }}
</div>
<div class="form-actions">
    <button type="submit" class="btn btn-primary pull-right">
        Ajoutetr <i class="fa fa-arrow-circle-right"></i>
    </button>
</div>
{{ form_end(form) }}