python - django-mptt order_by() 在递归树期间不工作

Question

我目前正在使用django-mptt Django 包，我正在尝试运行 .order_by()针对过滤器，但它不起作用 - 更具体地说，无论如何，顺序保持不变 order_by()我用。这是我当前的代码:

View .py

class ArticleModalView(View):
    def get(self, request):
        article_id = request.GET['article_id']
        article = get_object_or_404(Article, id=article_id)

        article_comments_recent = ArticleComment.objects.filter(article=article).order_by('-created')

        return render(request, '_includes/_article-modal.html', {'article': article, 'article_comments_recent': article_comments_recent})

_article-modal.html

<ul class="root">
    {% recursetree nodes %}
        <li>
            {{ node.name }}
            {% if not node.is_leaf_node %}
                <ul class="children">
                    {{ children }}
                </ul>
            {% endif %}
        </li>
    {% endrecursetree %}
</ul>

Answer 1

所以我刚刚想通了!我不得不混合几个不同的答案，但看起来解决方案如下:

I've done lots of .filter().order_by() chains just as you have them there, and nothing jumps out to me as out of place. I've never tried to carry that ordering over to the template without further processing the objects though (usually iterate over them), so I wonder if the order_by() is lost as part of django's lazy evaluation? Maybe try wrapping the filter().order_by() line in a list() to force evaluation there instead of it being put off till some later time?

via StackOverflow Question: "order_by() doesn't work with filter() in Django view"

article_comments_recent = ArticleComment.objects.filter(article=article).order_by('-created')

应该是:

article_comments_recent = list(ArticleComment.objects.filter(article=article).order_by('tree_id', 'level', '-created'))