Django的。在自定义clean（）方法中为Form.errors添加一个字段 [英] django. adding a field to Form.errors in a custom clean() method

问题描述

我有一个事件模型，我想在自定义的 def clean（self）：方法中放置以下验证规则：

I have an Event model that I'd like to place the following validation rule on, in a custom def clean(self): method on the Model:

def clean(self):
    from django.core.exceptions import ValidationError
    if self.end_date is not None and self.start_date is not None:
        if self.end_date < self.start_date:
            raise ValidationError('Event end date should not occur before start date.')

哪个工作正常，除了我想在管理界面中突出显示 self.end_date 字段，通过某种方式将其提名为具有错误的字段。否则我只收到更改表单顶部出现的错误消息。

Which works fine, except that I'd like to highlight the self.end_date field in the admin UI, by somehow nominating it as the field that has errors. Otherwise I only get the error message that occurs at the top of the change form.

推荐答案

docs 说明如何执行此操作。

The docs explain how to do this at the bottom.

提供的示例： strong>

provided example:

class ContactForm(forms.Form):
    # Everything as before.
    ...

    def clean(self):
        cleaned_data = self.cleaned_data
        cc_myself = cleaned_data.get("cc_myself")
        subject = cleaned_data.get("subject")

        if cc_myself and subject and "help" not in subject:
            # We know these are not in self._errors now (see discussion
            # below).
            msg = u"Must put 'help' in subject when cc'ing yourself."
            self._errors["cc_myself"] = self.error_class([msg])
            self._errors["subject"] = self.error_class([msg])

            # These fields are no longer valid. Remove them from the
            # cleaned data.
            del cleaned_data["cc_myself"]
            del cleaned_data["subject"]

        # Always return the full collection of cleaned data.
        return cleaned_data

为您的代码：

class ModelForm(forms.ModelForm):
    # ...
    def clean(self):
        cleaned_data = self.cleaned_data
        end_date = cleaned_data.get('end_date')
        start_date = cleaned_data.get('start_date')

        if end_date and start_date:
            if end_date < start_date:
                msg = 'Event end date should not occur before start date.'
                self._errors['end_date'] = self.error_class([msg])
                del cleaned_data['end_date']
        return cleaned_data

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