ValueError：视图videos.views.add_comment_post 没有返回HttpResponse 对象它在 Django 中返回 None 而不是

问题描述

我试图在帖子中添加评论，但它引发了这个错误，我使用 ajax 提交了我的评论，但问题似乎来自视图，但我无法弄清楚问题究竟是什么

我的添加评论查看

@login_required
def add_comment_post(request):
comment_form = PostCommentForm(request.POST)
            if comment_form.is_valid():
                user_comment = comment_form.save(commit=False)
                user_comment.author = request.user
                user_comment.save()

                result = comment_form.cleaned_data.get('content')
                user = request.user.username
                return JsonResponse({'result': result,'user': user})

我的评论模型

class PostCommentIDF(MPTTModel):

    post = models.ForeignKey(Post,on_delete=models.CASCADE,related_name='pos_com')
    parent = TreeForeignKey('self',null=True,blank=True,related_name='post_children')
    author = models.ForeignKey(Account,on_delete=models.CASCADE)
    content = models.TextField()
    publish = models.DateTimeField(auto_Now_add=True)
    status = models.BooleanField(default=True)
    likes = models.ManyToManyField(Account,related_name='pos_com')

    class MPTTMeta:
        order_insertion_by = ['-publish']

    def __str__(self):
        return f'{self.author}---{self.content[:15]}'

我的评论表单

class PostCommentForm(forms.ModelForm):

def __init__(self,*args,**kwargs):
    super().__init__(*args,**kwargs)

class Meta:
    model = PostCommentIDF
    fields = {'post','content'}
    widgets = {
        'content': forms.Textarea(attrs={'class': 'rounded-0  form-control','rows': '1','placeholder': 'Comment','required': 'True'})
    }
def save(self,**kwargs):
    PostCommentIDF.objects.rebuild()
    return super(PostCommentForm,self).save(*args,**kwargs)

模板中的评论表单

                  <form id="Postcommentform" class="Postcommentform" method="post" style="width: 100%;">
                      {% load mptt_tags %}
                        {% csrf_token %}
                                    <select class="d-none" name="video" id="id_video">
                                        <option value="{{ video.id }}" selected="{{ video.id }}"></option>
                                    </select>
                                          <div class="d-flex">
                                    <label class="small font-weight-bold">{{ comments.parent.label }}</label>
                                    {{ comment_form.parent }}

                                    {{comments.content}}
                    
                                <button value="Postcommentform" id="Postnewcomment" type="submit"  style="color: white; border-radius: 0;" class="d-flex justify-content-end btn btn-primary">Post</button>
                              </div>
                  </form>

解决方法

当表单无效时，您的 if 语句下的代码将不会执行，因此您的函数将返回 None 而不是 HttpResponse。
您应该在 esle 语句中处理它，例如：

@login_required
def add_comment_post(request):
    comment_form = PostCommentForm(request.POST)
    if comment_form.is_valid():
        user_comment = comment_form.save(commit=False)
        user_comment.author = request.user
        user_comment.save()

        result = comment_form.cleaned_data.get('content')
        user = request.user.username
        return JsonResponse({'result': result,'user': user})
    else:
        return JsonResponse({'result': "form is not valid"})