form.save不會保存數據，也不會向數據庫添加任何行

Question

我有一個模型，如下所示：

class ProductLeastDiscountLog(LoggableModel):
    product = models.ForeignKey(ProductType, verbose_name='a', on_delete=models.CASCADE, related_name='least_discount_log')
n_weeks = models.IntegerField('a', null=True, blank=True)
    buy_price = models.BigIntegerField('a a', null=True, blank=True)
    future_sell_price = models.BigIntegerField('a a', null=True, blank=True)
    mean_sell_prediction = models.IntegerField('a a a a a', null=True, blank=True)
    discount_factor = models.FloatField('a a a', null=True, blank=True)
    least_discount = models.FloatField('a a a', null=True, blank=True)

我想使用一個模型將該模型的對象添加到數據庫：

class LeastDiscountForm(BaseModelForm):
class Meta:
    model = ProductLeastDiscountLog
    fields = ('n_weeks','buy_price', 'future_sell_price', 'mean_sell_prediction', 'discount_factor')

但是在調用form.save db后仍然為空：

def action_view(self, http_request, selected_instances):
    if http_request.method == 'POST':
        form = self.modelForm(http_request.POST, http_request.FILES, instance=selected_instances[0],
                              http_request=http_request)
        print('let me see if form is vaid')
        if form.is_valid():
            print('form is valid')
            form.save()
            form = None
    else:
        form = self.modelForm(instance=selected_instances[0], http_request=http_request)

    return render(http_request, 'manager/actions/add_edit.html', {'form': form, 'title': self.form_title})

Answer 1

您必須像這樣更改表格：

class LeastDiscountForm(ModelForm):
    class Meta:
        model = ProductLeastDiscountLog
        fields = ('n_weeks','buy_price', 'future_sell_price', 'mean_sell_prediction', 'discount_factor')


...


def action_view(self, http_request, selected_instances):
    if http_request.method == 'POST':
        form = self.modelForm(http_request.POST, http_request.FILES, instance=selected_instances[0])
        print('let me see if form is vaid')
        if form.is_valid():
            print('form is valid')
            form.save()
            form = None
    else:
        form = self.modelForm(instance=selected_instances[0])
    return render(http_request, 'manager/actions/add_edit.html', {'form': form, 'title': self.form_title})

表單必須是ModelForm的子級，而不是BaseModelForm。 並且您不能傳遞額外的參數來初始化表單（http_request）