Question

我正在关注自定义表单集验证的Django Formset Documents上发布的示例，稍作修改。我在示例中发现了一个缺陷，但不确定如何修复它。如果3个输入字段中的1个未完全填写，是否有办法检查数据的唯一性？显然，空表单被记录为“无”，这迫使我至少填写2/3组输入字段（名字/姓氏）;否则，它将注册为重复。说明我的意思：

forms.py

class UserInfo (forms.Form):

    first_name = forms.CharField (max_length = 20, required = False)
    last_name = forms.CharField (max_length = 20, required = False)


class BaseUserInfoFormSet (BaseFormSet):

    def clean (self):
        if any (self.errors):
            return

        firstnames = []
        lastnames = []
        errors = []

        for form in self.forms:
            firstname = form.cleaned_data.get ('first_name')
            lastname = form.cleaned_data.get ('last_name')

            if ((firstname in firstnames) or (lastname in lastnames)) and len (errors) < 2:
                errors.append ('First and/or last name must be unique')
            if ((firstname == '') or (lastname == '')) and len (errors) < 2:
                errors.append ('First and/or last name cannot be blanked')

            firstnames.append (firstname)
            lastnames.append (lastname)
            print ('First Name List: ', firstnames)
            print ('Last Name List: ', lastnames)

        if errors:
            raise forms.ValidationError (errors)

        return self.cleaned_data

只填写了一组firstname / lastname，这是控制台的结果。

First Name List:  ['John']
Last Name List:  ['Doe']

First Name List:  ['John', None]
Last Name List:  ['Doe', None]

First Name List:  ['John', None, None]
Last Name List:  ['Doe', None, None]

由于存在重复的“无”，因此触发了错误：

errors.append ('First and/or last name must be unique')

Answer 1

只是为了澄清，您不需要空值，为什么不填写所需的字段。这将完全删除None问题，因为那时将需要所有字段。

否则，如果值不为空，则只能将值添加到列表中

if firstname: 
    firstnames.append(firstname)
if lastname: 
    lastnames.append(lastname)

Answer 2

我想我通过添加＆＃39; if＆＃39;来修复它。检查无的声明。

if (firstname or lastname) is not None:
    firstnames.append (firstname)
    lastnames.append (lastname)

如何检查Django表单中的唯一数据？

2 个答案: