匹配查询不存在。 /blog/postComment 不存在

Question

我正在尝试在我的博客中添加评论和回复功能。但它不断地向我抛出“BlogComment 匹配查询不存在”的错误。

def postComment(request):
    if request.method == "POST":
        comment = request.POST.get('comment')
        user = request.user
        postSno = request.POST.get('postSno')
        post = Post.objects.get(sno=postSno)
        parentSno = request.POST.get('parentSno')
        if parentSno == "":
            comment = BlogComment(comment=comment, user=user, post=post)
            comment.save()
            messages.success(request, "Your comment has been posted successfully")
        else:
            parent = BlogComment.objects.get(sno=parentSno)
            comment = BlogComment(comment=comment, user=user, post=post, parent=parent)
            comment.save()
            messages.success(request, "Your reply has been posted successfully")

Answer 1

当指定键不存在时，get()方法returnsNone默认。

所以你应该检查 if parentSno is not None: 而不是 if parentSno == "":。

（或者，您也可以使用 get() 方法的第二个参数更改该默认值：parentSno = request.POST.get('parentSno', "")（例如 see here））。