利用Django模版生成树状结构实例代码

class Comment(models.Model):
 body = models.TextField('正文', max_length=300)
 author = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name='作者', on_delete=models.CASCADE)
 article = models.ForeignKey(Article, verbose_name='文章', on_delete=models.CASCADE)
 parent_comment = models.ForeignKey('self', verbose_name="上级评论", blank=True, null=True, on_delete=models.CASCADE)

@register.simple_tag
def query(qs, **kwargs):
 """ template tag which allows queryset filtering. Usage:
   {% query books author=author as mybooks %}
   {% for book in mybooks %}
   ...
   {% endfor %}
 """
 return qs.filter(**kwargs)

{% load blog_tags %}
{% load comments_tags %}
 <div id="commentlist-container" class="comment-tab" style="display: block;">
    <ol class="commentlist">
     {% query article_comments parent_comment=None as parent_comments %}
     {% for comment_item in parent_comments %}
      {% with 0 as depth %}
       {% include "comments/tags/comment_item_tree.html" %}
      {% endwith %}
     {% endfor %}
    </ol>
   </div>

{% load blog_tags %}
<li class="comment even thread-even depth-{{ depth }} parent" id="comment-{{ comment_item.pk }}"
 style="margin-left: {% widthratio depth 1 3 %}rem">
 <div id="div-comment-{{ comment_item.pk }}" class="comment-body">
  <div class="comment-meta commentmetadata">
   {{ comment_item.created_time }}
  </div>
  <p>{{ comment_item.body |escape|custom_markdown }}</p>
  <div class="reply"><a class="comment-reply-link"
        href="javascript:void(0)" rel="external nofollow" 
        onclick="do_reply({{ comment_item.pk }})"
        aria-label="回复给{{ comment_item.author.username }}">回复</a></div>
 </div>

</li><!-- #comment-## -->
{% query article_comments parent_comment=comment_item as cc_comments %}
{% for cc in cc_comments %}
 {% with comment_item=cc template_name="comments/tags/comment_item_tree.html" %}
  {% with depth=depth|add:1 %}
   {% include template_name %}
  {% endwith %}
 {% endwith %}
{% endfor %}