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python - ValueError：没有返回 HttpResponse 对象。它返回 None 而不是

问题描述

我想编辑我的帖子时遇到问题。当我按下编辑时 - 我有这个问题：

ValueError at /post/19/edit/
The view blog.views.post_edit didn't return an HttpResponse object. It returned None instead.

网址.py：

url(r'^post/(?P<pk>\d+)/edit/$', views.post_edit, name='post_edit'),

视图.py：

def post_edit(request, pk):
post = get_object_or_404(Post, pk=pk)
if request.method == "POST":
    form = PostForm(request.POST, request.FILES, instance=post)
    if form.is_valid():
        post = form.save(commit=False)
        post.author = request.user
        post.published_date = timezone.now()
        post.save()
        return redirect('post_detail', pk=post.pk)
    else:
        form = PostForm(instance=post)
        return render(request, 'blog/post_edit.html', {'form':form})

post_edit.html：

{% block content %}
<h1>Edit Post</h1>
<form method="post" class="post-form" enctype="multipart/form-data">{% csrf_token %}
{{ form.as_p }}
<button type="submit" class="save btn btn-default">Save</button>
</form>
{% endblock %}

标签： pythondjangopython-3.xdjango-formsdjango-views

解决方案

您的缩进在几个地方是错误的。如果请求不是 POST，则需要实例化空白表单；你需要在任何情况下返回。所以：

def post_edit(request, pk):
    post = get_object_or_404(Post, pk=pk)
    if request.method == "POST":
        form = PostForm(request.POST, request.FILES, instance=post)
        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            post.published_date = timezone.now()
            post.save()
            return redirect('post_detail', pk=post.pk)
     else:
        form = PostForm(instance=post)
     return render(request, 'blog/post_edit.html', {'form':form})

请注意else与 firstif的对齐方式，并且 return 在它们两者之外。

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