<div class="form-group">
    {% include "rest_framework/fields/vertical/label.html" %}
    <select class="form-control" name="{{ field.field_name }}">
        {% for key, text in field.choices.items %}
        <option value="{{ key }}" {% if key == field.value %}selected{% endif %}>{{ text }}</option>
        {% endfor %}
    </select>
</div>
