Django 自定义表单验证/清理

Question

好的，所以我有一个表单，根据下拉列表的值，只需要填写某些字段，但是我会收到一个名为"discountpercent"的键的关键错误，因为如果我将其留空，则看不到它对cleaned_data的坚持，然后当自定义清理尝试运行时，我收到密钥错误，因为它找不到它。

def clean(self):
    data = self.cleaned_data
    print(str(data))
    #try:
    #    if data['discountcode']:
    #        code = data['discountcode']
    #        try:
    #            DiscountCode.objects.filter(discountcode=code)
    #            self._errors["discountcode"] = ErrorList([u"Discount code must be unique."])
    #        except:
    #            pass
    #except:
    #    pass
    if data['discounton'] == '1' and not data['discountitem']:
        self._errors["discounton"] = ErrorList([u"Please select items to apply discount on."])
    elif data['discounton'] == '2' and not data['discountcategory']:
        self._errors["discounton"] = ErrorList([u"Please select category to apply discount on."])
    elif data['discounton'] == '3':
        pass

    if data['discounttype'] == '1' and not data['discountpercentage']:
        self._errors["discounttype"] = ErrorList([u"Please provide a percentage to discount."])
    elif data['discounttype'] == '2' and not data['discountvalue']:
        self._errors["discounttype"] = ErrorList([u"Please provide a value to discount."])

    if data['discountexpiry'] == '1' and not data['discountexpiryuse']:
        self._errors["discountexpiry"] = ErrorList([u"Please provide a redeem limit."])
    elif data['discountexpiry'] == '2' and not data['discountexpirydate']:
        self._errors["discountexpiry"] = ErrorList([u"Please provide a date disable this discount code."])
    elif data['discountexpiry'] == '3':
        pass
    return data

如果我打印折扣类型 == '1' 且折扣百分比留空的cleaned_data，这就是我得到的。

{'uselimit': u'3', 'discounton': u'1', 'discountcode': u'uyhgkjhg', 'mincarttotal':   u'3', 'discountstart': u'2014-02-19', 'marketid': None, 'discountitem': [], 'uses': None, 'discountcategory': [], 'owner': None, 'discounttype': u'1', 'discountexpiry': u'3'}

感谢任何可以帮助它的人，这意味着一如既往！

Answer 1

正如您所说，如果未填写该字段，则cleaned_data中不存在该字段。您应该检查密钥是否存在，而不是检查值：

if data['discounton'] == '1' and 'discountitem' not in data: