{% macro render_field(field) %}
    <label class="control-label" for="{{ field.name }}">{{ field.label }}</label>
    <div class="control-group {% if field.errors %} error {% endif %}">
        <div class="controls">
            {{ field(**kwargs)|safe }}
            {{ render_errors(field) }}
        </div>
    </div>
{% endmacro %}

{% macro render_errors(field) %}
    <span class="help-inline">
            {% if field.errors %}
                <ul class="unstyled">
                    {% for error in field.errors %}
                        <li>{{ error }}</li>
                    {% endfor %}
                </ul>
            {% endif %}
    </span>
{% endmacro %}