How is reply associated with comment ?

[tian-yan]

I am reviewing source code of django_comments_xtd.
When user replies to existing comments by clicking on "Reply",

## /templates/django_comments_xtd/comment_tree.html
{% if item.comment.allow_thread and not item.comment.is_removed %}
    {% if allow_feedback %}&nbsp;&nbsp;<span class="text-muted">&bull;</span>&nbsp;&nbsp;{% endif %}<a class="small mutedlink" href="{{ item.comment.get_reply_url }}">{% trans "Reply" %}</a>
{% endif %}

User will be taken to http://example.com/comments/reply/(comment_pk), and handled by views.rely.

## django_comments_xtd/views.py
def reply(request, cid):
    ...
    return render(request, "django_comments_xtd/reply.html",
                  {"comment": comment, "form": form, "cid": cid, "next": next})

Then in django_comments_xtd/reply.html

## django_comments_xtd/reply.html
...
<div class="card-body">
    <h4 class="card-title text-center pb-3">{% trans "Post your comment" %}</h4>
    {% include "comments/form.html" %}
</div>
...

Q: I really did not see implementation that associates the reply with the existing comment, in other words, the reply's thread_id, parent_id, level are given value accordingly. Did I overlook anything?

why I want to dig out this is because I want to customize it a bit so that clicking on reply will not redirect user to another URL but open comment dialog box right below the reply button, then user types in comments and click "send" directly.