Django如何通过模型表单保存m2m字段

Question

如何将我的表单中的payment_mode值保存到PaymentChoices模型中？

models.py

9 PAYMENT_MODE=(('Credit Card','Credit Card'),('Bank Transfer','Bank Transfer'), 
10    ('Bankdraft/Cheque','Bankdraft/Cheque'), 
11    ('Other','Other')) 
12 
13 class PaymentChoices(models.Model): 
14  currency = models.CharField('Payment Modes', choices=PAYMENT_MODE, max_length=25) 
15 
16 class EventPaymentDetail(models.Model): 
17  event = models.ForeignKey(Event) 
18  merchant_name = models.CharField('Merchant Name', max_length=50, blank=True, null=True, default='INMEET CMS PTE LTD') 
19  currency = models.CharField('Currency', choices=CURRENCY_LIST, default='SGD', max_length=3) 
20  payment_mode = models.ManyToManyField(PaymentChoices) 
21  transaction_prefix = models.CharField(max_length=5, blank=True, null=True) 
22  tax = models.DecimalField('Tax', decimal_places=2, max_digits=10, default=0) 
23  terms = models.CharField('Terms and Conditions', max_length=2500, blank=True, null=True) 
24  modified = models.DateTimeField(auto_now=True, editable=False) 
25  created = models.DateTimeField(default=datetime.datetime.now, editable=False)�editable=False) 

forms.py

9 class EventPaymentDetailForm(forms.ModelForm): 
10  account_name = forms.CharField(label='Account Name', max_length=100, required=False) 
11  bank_name = forms.CharField(label='Bank Name', max_length=100, required=False) 
12  branch_name = forms.CharField(label='Branch Name', max_length=100, required=False) 
13  address = forms.CharField(label='Bank Address' ,max_length=100, required=False) 
14  account_number = forms.CharField(label='Account Number', max_length=50, required=False) 
15  payment_mode = forms.MultipleChoiceField(label='Payment Mode', widget=CheckboxSelectMultiple(), choices=PAYMENT_MODE) 
16 
17  class Meta: 
18   model = EventPaymentDetail 
19   fields = ('merchant_name', 
20     'currency', 
21     'payment_mode', 
22     'account_name', 
23     'account_number', 
24     'bank_name', 
25     'branch_name', 
26     'address', 
27     'transaction_prefix', 
28     'tax', 
29     'terms',) 
30   widgets = {'terms': forms.Textarea } 

views.py

20 @login_required 
21 @event_admin_only 
22 def payment_details(request, event_slug, role_id, module_slug): 
23  event = get_object_or_404(Event, slug=event_slug) 
24  payment_details = EventPaymentDetail.objects.get_or_create(event=event)[0] 
25  bank_details = EventBankAccountDetail.objects.get_or_create(event=event)[0] 
26 
27  if request.method == 'POST': 
28   payment_form = EventPaymentDetailForm(request.POST, instance=payment_details) 
29   display_error(request, payment_form) 
30   if payment_form.is_valid(): 
31 
32    cd = payment_form.cleaned_data 
33    bank_details.account_number = cd['account_number'] 
34    bank_details.bank_name = cd['bank_name'] 
35    bank_details.address = cd['address'] 
36    bank_details.account_name = cd['account_name'] 
37    bank_details.branch_name = cd['branch_name'] 
38    bank_details.save() 
       # stuck here ??? 
40    payment_details = payment_form.save() 
42 
43    messages.success(request, 'Payment details successfully saved!') 
44    url = reverse('registration_item_details', args=[event_slug, role_id, module_slug]) 
45    return redirect(url) 
46 
47  else: 
48   initial_values={'account_number': bank_details.account_number, 
49       'account_name': bank_details.account_name, 
50       'bank_name': bank_details.bank_name, 
51       'address': bank_details.address, 
52       'branch_name': bank_details.branch_name} 
53   payment_form = EventPaymentDetailForm(initial=initial_values, instance=payment_details) 
54 
55  template = 'registration/payment_details.html' 
56  return render(request, template, locals()) 

request.POST

{'bank_name': u'', 'terms': u'tesfefsef', 'branch_name': u'', 'tax': Decimal('0.10'), 'transaction_prefix': u'234', 'currency': u'SGD', 'account_number': '', 'address': u'', 'payment_mode': [u'Credit Card', u'Bank Transfer', u'Bankdraft/Cheque', u'Other'], 'account_name': u'', 'merchant_name': u'INMEET CMS PTE LTD'} 

Answer 1

答案是使用ModelMultipleChoiceField像这样：在模型

payment_mode = forms.ModelMultipleChoiceField(label='Payment Mode', widget=CheckboxSelectMultiple(), queryset=PaymentChoices.objects.all()) 

的初始值将是空的，所以你必须从选择列表中的值来填充它。