<div class="list-group">
  {% for category in categories %}
    {% if category.category_id == category_id %}
      <a href="{{ category.href }}" class="list-group-item active">{{ category.name }}</a>
      {% if category.children %}
        {% for child in category.children %}
          {% if child.category_id == child_id %}
            <a href="{{ child.href }}" class="list-group-item active">&nbsp;&nbsp;&nbsp;- {{ child.name }}</a>
          {% else %}
            <a href="{{ child.href }}" class="list-group-item">&nbsp;&nbsp;&nbsp;- {{ child.name }}</a>
          {% endif %}
        {% endfor %}
      {% endif %}
    {% else %}
      <a href="{{ category.href }}" class="list-group-item">{{ category.name }}</a>
    {% endif %}
  {% endfor %}
</div>