{{ form_start(form) }}
<div class="row">
    <div class="col-md-12">
        {{ form_row(form.roles) }}
    </div>
    <div class="col-md-6">
        {{ form_row(form.username) }}
        {{ form_row(form.nom) }}
    </div>
    <div class="col-md-6">
        {{ form_row(form.prenom) }}
    </div>
    <div class="col-md-12">
        {{ form_row(form.email) }}
    </div>
</div>
<div class="row">
    <div class="col-md-6">
        {{ form_row(form.estActif) }}
    </div>
</div>

{{ form_widget(form) }}
<button class="btn btn-save">{{ button|default('Enregistrer') }}</button>
{{ form_end(form) }}