提交多對多的ModelForm

Question

時，「選擇一個有效的選擇。 不是可用的選項之一」的錯誤我想一個ManyToManyField的選擇限制爲那些匹配一個ForeignKey。表單顯示正確，但在保存結果時出現錯誤「選擇一個有效的選擇不是可用的選項之一」。

之前我試圖通過在視圖將參數傳遞給形式，並且然後使用該參數來過濾的查詢集來限制查詢集。

型號：

class VenueEventTimeslot(models.Model): 
    venue = models.ForeignKey(Venue) 
    name = models.CharField(max_length=255) 

class VenueEvent(models.Model): 
    venue = models.ForeignKey(Venue) 
    event_timeslots = models.ManyToManyField(VenueEventTimeslot)  

class VenueEventForm(ModelForm): 
    event_timeslots = ModelMultipleChoiceField(queryset=None, widget=CheckboxSelectMultiple()) 

    def __init__(self, *args, **kwargs): # limit timeslots to those of the venue only 
     venue_obj = kwargs.pop('venue_obj',None) 
     super(VenueEventForm, self).__init__(*args,**kwargs) 
     self.fields['event_timeslots'].queryset=VenueEventTimeslot.objects.filter(venue=venue_obj) 

    class Meta: 
     model = VenueEvent 
     fields = ['event_timeslots'] 

瀏覽：

@login_required 
def calendar(request, pk): 
    venue = Venue.objects.get(pk = pk) 

    if request.method == "POST": 
     form = VenueEventForm(request.POST) 
     if form.is_valid(): 
      # form stuff 
     else: 
      form = VenueEventForm(venue_obj = venue) 

    context = {'venue':venue, 'form':form} 
    return render(request, ... , context) 

但是，如果我從視圖通過查詢集，它完美的作品。

型號：

class VenueEventTimeslot(models.Model): 
    # same as above 

class VenueEvent(models.Model): 
    # same as above 

class VenueEventForm(ModelForm): 
    class Meta: 
    model = VenueEvent 
    fields = ['date','client_name','event_timeslots'] 
    widgets = { 
     'date': SelectDateWidget(), 
     'event_timeslots': CheckboxSelectMultiple(), 
    } 

瀏覽：

@login_required 
def calendar(request, pk): 
    venue = Venue.objects.get(pk = pk) 

    if request.method == "POST": 
     form = VenueEventForm(request.POST) 
     if form.is_valid(): 
      # form stuff 
     else: 
      form = VenueEventForm() 
    form.fields['event_timeslots'].queryset=VenueEventTimeslot.objects.filter(venue=venue) 

    context = {'venue':venue, 'form':form} 
    return render(request, ..., context) 

會有人能夠擺脫這方面的一些輕？

Answer 1

我剛剛解決與此類似昨天是在這裏，How To Exclude A Value In A ModelMultipleChoiceField?一個問題，但我認爲你的初始化函數的問題是，它被格式化的方式。相反場地= venue_obj的，你需要改變它的PK = venue_obj，因爲它出現在你越來越場地PK的看法，而不是VenueEvent會場屬性，我重新格式化您的形式有點使它看起來更乾淨。

forms.py

class VenueEventForm(ModelForm): 

    def __init__(self, *args, **kwargs): # limit timeslots to those of the venue only 
     venue_obj = kwargs.pop('venue_obj') 
     super(VenueEventForm, self).__init__(*args,**kwargs) 
     self.fields['event_timeslots'] = forms.ModelMultipleChoiceField(widget=forms.CheckboxSelectMultiple(), queryset=VenueEventTimeslot.objects.filter(pk=venue_obj)) 

    class Meta: 
     model = VenueEvent 
     fields = ['event_timeslots'] 

views.py

@login_required 
def calendar(request, pk): 
    venue = Venue.objects.get(pk = pk) 
    if request.method == "POST": 
     form = VenueEventForm(request.POST, venue_obj=venue) 
     if form.is_valid(): 
      # form stuff 
     else: 
      print VenueEventForm.errors 

    else: 
     form = VenueEventForm(venue_obj=venue) 
     context = {'venue':venue, 'form':form} 
     return render(request, ... , context)