django多值字段和多窗口小部件-使一个可选

这与我的一个朋友有关

我想有一个包含选项和文本输入小部件的多值字段。如果用户从选项中选择OTHER，则应保存TextInput的值。否则，应保存选项的值。到目前为止，我有以下代码：

custom_choices = [("one","one"),("two","two"),("OTHER","OTHER")]

class MyMultiWidget(forms.MultiWidget):
    def __init__(self,*args,**kwargs):
        widgets = (
            forms.Select(choices=custom_choices),
            forms.TextInput(),
        )
        super(MyMultiWidget, self).__init__(widgets,*args,**kwargs)

    def decompress(self, value):
        if value:
             return value.split("|")
        return ['', '']

class MyMultiValueField(forms.MultiValueField):
    def __init__(self, *args, **kwargs):
        fields = (
            forms.CharField(max_length=128,required=True),
            forms.CharField(max_length=128,required=False),
        )
        super(MyMultiValueField, self).__init__(fields, *args, **kwargs)
        self.widget = TestMultiWidget()

    def compress(self, data_list):
        if data_list:
            return '|'.join(data_list)

class MyTestField(models.CharField):
    def formfield(self, **kwargs):
        return super(MyTestField, self).formfield(form_class=MyMultiValueField)

class MyModel(models.Model):
    myField = MyTestField()

但是，每当我试图保存TextInput中不包含值的内容时，就会出现一个验证错误，该字段是必需的。这是尽管上述要求=假kwarg

我试图给clean函数添加一些逻辑；如果选择小部件的值为其他值，则忽略TextInput的小部件：

def clean(self,value):
    if value[0]!="OTHER":
        value[1]=u''
    else:
        if not value[1]:
            msg = "unspecified value"
            raise forms.ValidationError(msg)
        elif "|" in value[1]:
            msg = "bad value ('|' character is not allowed"
            raise forms.ValidationError(msg)
    super(TestFormField,self).clean(value)

但这没有效果

---

有什么建议吗？

清洁的正确版本应该如下所示：

def clean(self,value):
    if value[0] != "OTHER":
        value[1] = u' '
    else:
        if value[1].strip() == u' ':
            msg = "unspecified value"
            raise forms.ValidationError(msg)
        elif "|" in value[1]:
            msg = "bad value ('|' character is not allowed)"
            raise forms.ValidationError(msg)
    return "|".join(value)

---

啊哈！结果表明，clean必须返回一个压缩值。所以clean的最后一行应该是：return |。joinvaluecompress和clean应该总是返回一些东西。我认为这个字段是必填字段，指的是整个字段，而不仅仅是它的第二部分。