<div class="form-group {% if field.errors %}has-error{% endif %}">
    {% if field.label %}
        <label class="sr-only">{{ field.label }}</label>
    {% endif %}
    <select class="form-control" name="{{ field.name }}">
        {% for key, text in field.choices.items %}
        <option value="{{ key }}" {% if key == field.value %}selected{% endif %}>{{ text }}</option>
        {% endfor %}
    </select>
</div>
