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我正在建立一个具有评论和回复功能的论坛。在填写表格时，我面临一个问题

无法分配“<Post: Post object (10)>”：“Reply.comment”必须是“Comment”实例。 我可以理解这个问题，但不知道如何将它变成评论实例。我正在使用 Django 3.1.4

型号如下：

class Post(models.Model):
    headline = models.CharField(max_length = 100)
    context = models.TextField()
    author = models.ForeignKey(User, on_delete = models.CASCADE)
    created = models.DateTimeField(auto_now_add = True)
    modified = models.DateTimeField(auto_now = True)


class Comment(models.Model):
    post = models.ForeignKey(Post, on_delete = models.CASCADE)
    text = models.TextField(max_length = 200)
    author = models.ForeignKey(User, on_delete = models.CASCADE)
    created = models.DateTimeField(auto_now_add = True)
    modified = models.DateTimeField(auto_now = True)


class Reply(models.Model):
    comment = models.ForeignKey(Comment, related_name='replies',  on_delete=models.CASCADE)
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    timestamp = models.DateTimeField(auto_now_add=True)
    reply = models.TextField()

view.py 如下：

class PostDetail(DetailView):
    model = Post

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)
        context['comment_form'] = CommentForm()
        context['reply_form'] = ReplyForm()
        return context
 
    def post(self, request, *args, **kwargs):
        comment_form = CommentForm(request.POST)
        if comment_form.is_valid():
            comment = Comment(
                author = request.user, 
                post = self.get_object(),
                text = comment_form.cleaned_data['comment']
            )
            comment.save()
        else:
            comment = Comment()

        reply_form = ReplyForm(request.POST)
        if reply_form.is_valid():
            reply = Reply(
                user = request.user, 
                comment = self.get_object(), # This line is the issue!!!
                reply = reply_form.cleaned_data['reply']
            )
            reply.save()
        else:
            reply = Reply()     
        return redirect (reverse('postdetail', args=[self.get_object().id]))

我想这么多信息就足够了。真的需要了解如何去做。

谢谢

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