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Я пытаюсь создать новые экземпляры на основе формы ниже, однако при сохранении база данных сохраняет только значение внешнего ключа и значение заказа, но ничего больше. Есть идеи, почему?

Модели:

 class danceType(models.Model):
    eventtype = models.ForeignKey(compType)
    dance_name = models.CharField(max_length = 20)
    Price = models.FloatField(max_length = 7, null=True, blank=True )
    field_2 = models.CharField(max_length = 20, null=True, blank=True)
    def __unicode__(self):
      fields = ('field_2')
      return self.dance_name 


class dancer(models.Model):
    dancetype = models.ForeignKey(danceType)
    e_number = models.IntegerField(max_length = 4, null=True, blank=True)
    D1_first_name = models.CharField(max_length = 20)
    D1_last_name = models.CharField(max_length = 20)
    D1_email = models.EmailField(max_length = 20)
    city = models.CharField(max_length = 20)
    order = models.PositiveIntegerField()
    perform = models.NullBooleanField(null=True, blank=True)
  

Вид:

 if request.method =='POST':

    sub_type = request.POST.get("form")
    dancetype = request.POST.get("dancetype")
    ext = request.POST.get("quantity")

    form = modelformset_factory(dancer, form=CompReg, extra=int(ext))
    productform = form(queryset = dancer.objects.none())

    if sub_type == "submitted":

        productform = form(request.POST, request.FILES)

        if productform.is_valid():
            for p in productform:
                dance=p.save(commit=False)
                dance.dancetype_id = 4
                dance.order = 1
                dance.save()
        else:
            der = "it didnt save"