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我正在尝试将内联添加到我的模板中，但继续收到数据库错误：

 more than one row returned by a subquery used as an expression

我的 models.py 中有 3 个相互关联的对象。用户将能够看到选择了哪个教师并列出了该教师下的所有所有者（教师和所有者将仅显示为不可编辑的列表）。我想列出所有者下的所有宠物并进行编辑。关于我为什么收到此错误的任何想法？以及我如何才能实现我的目标？

模型.py

class Teacher(models.Model):
        teacher = models.CharField(max_length=300)

class Owner(models.Model):
       relevantteacher = models.ForeignKey(Teacher)     
       owner = models.CharField(max_length=300)

class PetName(models.Model):
        relevantowner = models.ForeignKey(Owner)
        pet_name = models.CharField(max_length=50)

表格.py

class OwnerForm(forms.ModelForm):
    class Meta:
       model = Owner

PetNameFormSet = inlineformset_factory(Owner,
    PetName,
    can_delete=False,
    extra=3,
    form=OwnerForm)

视图.py

def petname(request, teacher_id):
   teacher = get_object_or_404(Teacher, pk=teacher_id)

   owners = Owner.objects.filter(relevantteacher=teacher_id)

   if request.method == "POST":
      petNameInlineFormSet = PetNameFormSet(request.POST, request.FILES, instance=owners)

      if petNameInlineFormSet.is_valid():
         petNameInlineFormSet.save()

         return HttpResponseRedirect(reverse('success'))

   else:
      petNameInlineFormSet = PetNameFormSet(instance=owners) //error might be here?

   context = {'teacher': teacher, 'owners': owners, 'petNameInlineFormSet' : petNameInlineFormSet}
   return render(request, 'petname.html', context)

更新：

这是回溯：

File "hde/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.  response = callback(request, *callback_args, **callback_kwargs)
File "/views.py" in petname
  60.  petNameInlineFormSet = PetNameFormSet(instance=owners)
File "lib/python2.7/site-packages/django/forms/models.py" in __init__
  697.  queryset=qs, **kwargs)
File "lib/python2.7/site-packages/django/forms/models.py" in __init__
  424.  super(BaseModelFormSet, self).__init__(**defaults)
4

2 回答 2

1

只需将 1 个对象传递给实例

owner = owners[0]

然后 

instance=owner

但是，我一次只能添加/编辑 1 个主人的宠物名称。感谢阿米尔的帮助！

于 2013-08-06T00:01:27.807 回答
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我相信你的错误在views.py文件的第二行。get_object_or_404当您尝试teacher.id在模板中指定时，我相信这是对导致错误的方法的调用。对该get_object_or_404方法的调用从数据库返回多于一行，因此teacher.id无法从多于一行对其进行调用。

于 2013-08-05T23:00:50.690 回答