Django没有返回HttpResponse对象错误？

Question

ValueError at /blog/1/comment/new/ 

The view blog.views.comment_new didn't return an HttpResponse object. It returned None instead. 

Request Method: GET 

Request URL: http://localhost:8000/blog/1/comment/new/ 

为什么请求方法得到？

HTML

<form action="" method="post"> 
 
    {% csrf_token %} 
 
    <table> 
 
    {{ form.as_table }} 
 
    </table> 
 
    <input type="submit" /> 
 
</form>

VIEWS

@login_required 
def comment_new(request, post_pk): 
    post = get_object_or_404(Post, pk=post_pk) 

    if request.method == 'post': 
     form = CommentForm(request.POST) 
     if form.is_valid(): 
      comment = form.save(commit=False) 
      comment.post = post 
      comment.author = request.user 
      comment.save() 
      return redirect('blog:post_detail', post.pk) 
     else: 
      form = CommentForm() 
     return render(request, 'blog/comment_form.html', { 
      'form': form, 
     })` 

感谢

Answer 1

你正在返回只POST方法的响应。你必须像这样重构你的代码。

def call_comment_form(request): #your function name 
    form = CommentForm() 
    if request.method == 'post': 
     form = CommentForm(request.POST) 
     if form.is_valid(): 
      comment = form.save(commit=False) 
      comment.post = post 
      comment.author = request.user 
      comment.save() 
      return redirect('blog:post_detail', post.pk) 
     else: 
      form = CommentForm(request.post) #this will return the errors in your form 
    return render(request, 'blog/comment_form.html', { 
    'form': form, 
})` 

当URL被称为最初它是GET方法，所以你必须先发送形式的实例（空单）。