Django中的多個ModelForm

Question

我在models.py中有類似的東西

class A(models.Model):
   name = CharField(max_length=150)
class B(models.Model):
    a= ForeignKey(A)
    name =  CharField(max_length=150)

我在views.py中為兩者創建了modelform

def create(request):
     a_form = AForm()
     b_form = BForm()
     if request.method == 'POST':
          a_form = AForm(request.POST, prefix="a")
          b_form  = BForm(request.POST, prefix="b")
     if a_form.is_valid() and b_form.is_valid():
          a = a_form.save()
          b_form.cleaned_data["a"] = a
          b= b_form.save()
          return HttpResponseRedirect('/companies/detail/{b.id}')
     return render_to_response('companies/signup.html',{'AForm':a_form , 'BForm': b_form }, context_instance=RequestContext(request))

我得到這個錯誤

Exception Value: mysite_b.a_id may not be NULL

誰能告訴我我想念什么？

Answer 1

我認為即使在GET模式下，您也應該使用前綴：

def create(request):
>>   a_form = AForm(prefix="a") 
>>   b_form = BForm(prefix="b")
     if request.method == 'POST':
          a_form = AForm(request.POST, prefix="a")
          b_form  = BForm(request.POST, prefix="b")
     if a_form.is_valid() and b_form.is_valid():
          a = a_form.save()
>>        b = b_form.save(commit=False)
>>        b.a = a
>>        b.save()
          return HttpResponseRedirect('/companies/detail/{b.id}')
     return render_to_response('companies/signup.html',{'AForm':a_form , 'BForm': b_form }, context_instance=RequestContext(request))