Question

当另一个[关联]字段具有特定值时，如何使必填字段成为非必需字段？

我们假设我有以下模型：

class foo(models.Model):
    bar = models.CharField(max_length=200)
    foo_date = models.DateTimeField()

当我保存，并且bar包含某个值时，我希望foo_date成为非强制性的。我该如何做到这一点？感谢。

Answer 1

T.Stone是对的。这是您使用模型表单的方式：

class foo(models.Model):
    bar = models.CharField(max_length=200)
    foo_date = models.DateTimeField()

class ClientAdmin( MyModelAdmin ):
    form = FooModelForm

class FooModelForm( forms.ModelForm ):

    def clean(self):
        cleaned_data = self.cleaned_data
        if cleaned_data.get("bar") == 'some_val' and not cleaned_data.get('foo_date'):
            msg = 'Field Foo Date is mandatory when bar is some_val'
            self._errors[field] = ErrorList([msg])
            del cleaned_data[field]
        return cleaned_data

http://docs.djangoproject.com/en/dev/ref/forms/validation/#cleaning-and-validating-fields-that-depend-on-each-other

Answer 2

我认为只需将foo_barr设置为blank = True，然后为Admin模型实现自己的Form和自定义验证即可。请参阅文档的这一部分 - Adding custom validation to admin

Django Admin：强制字段非强制性动态

2 个答案: