无法在没有主键的情况下强制更新 save() 。恐怖！

Question

我不知道该怎么办，我是“空白”...

我有一个函数可以使用 request.GET 查询数据库并填写表单，您可以更改内容并保存更新信息。问题是 id 没有传递给函数，Django 选择 INSERT 而不是 UPDATE，代码如下：

看看这个混乱：

def meet_save(request):
  if request.method == 'POST':
    form = MeetingForm(request.POST)
      if form.is_valid():
        creator = get_object_or_404(Submitter, name=request.user)
        meeting = Meeting(creator=creator)
        meeting.ave = form.cleaned_data['ave']
        meeting.st = form.cleaned_data['st']
        meeting.date = form.cleaned_data['date']
        #it is supposed to work with save()
        #i tryed meeting.save(force_update=True)
        #and i figured out the id is missing
        meeting.save()
        for people in form.cleaned_data['people']:
            meeting.people.add(people)
        return HttpResponseRedirect('/meeting/register/')
  elif request.GET.has_key('meeting'):
    id = request.GET['meeting']        
    people = ''
    ave = ''
    st = ''
    date = ''
    try:
      meeting = meeting.objects.get(id=id)
      #id = unicode(request.GET['meeting'])
      #Have tryed different ways with no luck
      id = request.GET['meeting']
      ave = meeting.ave
      st = meeting.st
      date = meeting.date
      except:
        pass
      form = MeetingForm({
         'id':id, 'ave' : ave, 'st' : st,'date' : date
      })
  else:
    form = MeetingForm()
  variables = RequestContext(request, {
      'form': form,
  })
  return render_to_response('meeting/meeting_save.html', variables)

它收到一个在 GET 请求中传递的 meet=id （例如/meeting/register/meeting=3) 并且表单获取数据，但保存时会创建一个新行而不是更新它，但它在 Django 中不会像这样工作，也许是 PHP 但不是 Django！

这是 Django 的正确代码：

def meet_save(request):
  pk=request.GET['meeting'] #get the meeteng id from url
  form = MeetingForm(request.POST)
  if form.is_valid():
    meeting, created = Meeting.objects.get_or_create(id=pk)
    meeting.ave = form.cleaned_data['ave']
    meeting.st = form.cleaned_data['st']
    meeting.date = form.cleaned_data['date']
    meeting.people = form.claned_data['people']
    meeting.save()
    #for people in form.cleaned_data['people']:
      #meeting.people.add(people)
    return HttpResponseRedirect('/meeting/register/')
  else:
    meeting = get_object_or_404(Meeting, pk=request.GET['meeting'])# this is the id passed
    form = MeetingForm(instance=meeting)
  variables = RequestContext(request, {
        'form': form,
  })
  return render_to_response('meeting/meeting_save.html', variables)

我猜混乱可能会起作用，但我修复了我的模板，因为POST 是这样的：method=POST action="."，当我到达该页面时，我发现该网址没问题，但是当在帖子中发送数据时，它会清除 meeting= id 我认为那是真实的恐怖！！我将其更改为 action="" 我在文档中没有看到任何有关它的内容，并且我读过它是相同的，请注意它不是。
姜戈摇滚！！！

Answer 1

您是否有理由不使用 django 内置机制来使用关联对象填充表单？例如：

meeting = Meeting.objects.get(pk=id)
form = MeetingForm(instance=meeting)

另外，您应该使用 django 快捷方式 get_object_or_404 ，以便可以避免不需要的行为。因此，它不会创建一个新对象，而只会发回 404。没有什么坏处。