Question

我想知道我的代码出了什么问题。当我尝试保存数据时，它会被覆盖。

            if form.is_valid():
                for item in unions_choice_list:
                    announcement = form.save(commit=False)
                    obj = Union.objects.get(pk=item)
                    announcement.union = obj
                    announcement.tittle = request.POST.get('tittle')
                    announcement.message_text = request.POST.get('message_text')
                    tilldate = request.POST.get('till_date')
                    p = unicodedata.normalize('NFKD', tilldate).encode('ascii','ignore')
                    till_date1 = datetime.datetime.strptime(p, '%d %b %Y').date()
                    announcement.till_date = till_date1
                    announcement.type = type
                    announcement.message_from = request.POST.get('message_from')
                    announcement.show_to = 'union'

                    if request.FILES.get('file1') is not None:
                        announcement.file1 = request.FILES['file1']
                    announcement.save()
            else:
                messages.error(request, "Correct the displayed errors")

Answer 1

如果多次调用表单的save()方法，将始终保存相同的模型实例。要在每次调用时创建新实例，您必须将实例的pk设置为None：

for item in unions_choice_list:
    form.instance.pk = None
    announcement = form.save(commit=False)
    ...

或者，这是相同的：

for item in unions_choice_list:
    announcement = form.save(commit=False)
    announcement.pk = None
    ...

使用for循环django时覆盖的数据

1 个答案: