Django

跟着《 python 编程从入门到实践》练习 Django，遇到如下问题：创建了一个 Topic 表单，有一个 Entry 表单用外键链接到 Topic，在试图函数里定义了修改 Entry 的函数如下： def edit_entry(request, entry_id):

"""修改条目""" entry = Entry.objects.get(id=entry_id) topic = entry.topic if request.method != 'POST': form = EntryForm(instance=entry) else: form = EntryForm(instance=entry, data=request.POST.get('fields')) if form.is_valid(): form.save() return HttpResponseRedirect(reverse('xs:topic', args=[topic.id])) cOntext= {'topic': topic, 'form': form, 'entry': entry} return render(request, 'xs/edit_entry.html', context) 

现在我想修改 Topic，跟着上面的函数定义了下面这个函数：

def edit_topic(request, topic_id):

"""修改主题""" topic = Topic.objects.get(id=topic_id) if request.method != 'POST': form = TopicForm(instance=topic) else: form = TopicForm(instance=topic, data=request.POST.get('fields')) if form.is_valid(): form.save() return HttpResponseRedirect(reverse('xs:topics')) cOntext= {'topic': topic, 'form': form} return render(request, 'xs/edit_topic.html', context) 

这就出问题了，第二个 if 语句(if form.is_valid())似乎没有执行，导致没有跳转至 topics.html 页面