django - Djangoインライン外部キーが親主キーと一致しません

Question

インライン フォームを使用して Django エラーを回避するための助けが必要です。私はこれを理解できないようです。検証を試みる前にその方法を理解できれば、おそらく eventID を強制的に挿入できます。

フォームを送信すると、次のエラーが表示されます。Hidden field (event): The inline foreign key did not match the parent instance primary key

このコードを機能させる方法はありますか?

次のコードは、教師がイベントに複数の生徒を登録できるようにすることを想定しています。

------ モデル.py ------------

class Event(models.Model):
    title = models.CharField(max_length=200)
    description = models.CharField(max_length=200)
    time = models.DateTimeField()
    duration = models.DecimalField(max_digits=5, decimal_places=2)
    location = models.CharField(max_length=200)


# Customer is a parent, teacher, or school
class Customer(models.Model):
    event = models.ForeignKey(Event)
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30) 
    address1 = models.CharField(max_length=60) 
    address2 = models.CharField(max_length=60, blank=True) 
    city = models.CharField(max_length=30) 
    state = models.CharField(max_length=2) 
    zipcode = models.CharField(max_length=5) 
    phone_number = models.CharField(max_length=30)
    email = models.EmailField()


# A customer can enroll several students for a single event.
class Attendee(models.Model):
    event = models.ForeignKey(Event)
    sponsor = models.ForeignKey(Customer)
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30) 

------ forms.py -----------

class AttendeeForm(forms.ModelForm):
  event = forms.IntegerField(required=True, widget=forms.HiddenInput())

  class Meta:
    model = Attendee
    fields = ( 'event', 'last_name', 'first_name', 'gender', 'schoolYr', )
    #exclude = ('event', )
    #widgets = {
    #     'dtgPurchase' : DateTimeWidget(),
    #}

  def __init__(self, *args, **kwargs):
      super(AttendeeForm, self).__init__(*args, **kwargs)

---------- views.py ----------

def register3(request, event_id):
  messages = []
  try:
    event = get_object_or_404(Event, id=event_id)  #Event ID is passed in here.
    AttendeeFormSet = inlineformset_factory(Event, Attendee, form=AttendeeForm, extra=1)
    #AttendeeFormSet = formset_factory(AttendeeForm)
    if request.method == 'POST':
      print "POST"
      formset = AttendeeFormSet(request.POST, request.FILES, prefix='attendees')
      #formset.save(commit=False)
      i=0
      for form in formset.forms:
         print "Form %s " % str(i)
         #  ??  Is is possible to set the event Here? 

      if formset.is_valid():
          attendees = formset.save_all()
          print "Yay!!!"   
          #return redirect('event_view', event_id=event.id)
      else:
          print "Invalid formset"

    else:   # is get method on first step
      formset = AttendeeFormSet(instance=event, prefix='attendees')
      print "Event: %s " % event

  except Event.DoesNotExist:
      raise Http404

  c = Context({
      'messages': messages,
      'event' : event,
      'attendees': formset,
  })
  return prepCxt(request, 'register3.html', c)