Django 表单验证:制作“必需"有条件的? [英] Django form validation: making "required" conditional?

问题描述

我是 Django(和 Python)的新手，我正在尝试弄清楚如何对表单验证的某些方面进行条件化.在这种情况下，应用程序有一个 HTML 界面，用户可以在其中从小部件中选择日期和时间.表单对象上的 clean 方法获取时间和日期字段的值并将它们转换回 datetime.

I'm new to Django (and Python), and am trying to figure out how to conditionalize certain aspects of form validation. In this case, there's a HTML interface to the application where the user can choose a date and a time from widgets. The clean method on the form object takes the values of the time and date fields and turns them back into a datetime.

除了 HTML 界面，还有一个 iPhone 客户端调用应用程序，我想传入一个 UNIX 时间戳样式的时间值.

In addition to the HTML interface, there's also an iPhone client making calls into the application, and I'd like to pass a UNIX timestamp-style time value in.

我的表单代码如下所示:

My form code looks like this:

class FooForm(forms.ModelForm):
    foo_date             = forms.CharField(required=True, widget=forms.RadioSelect(choices=DATE_CHOICES))
    foo_time             = forms.CharField(required=True, widget=SelectTimeWidget())
    foo_timestamp        = forms.CharField(required=False)

如何使 foo_date 和 foo_time 成为必需的除非 foo_timestamp 已提供?

How do I make foo_date and foo_time required unless foo_timestamp is provided?

推荐答案

这是通过表单上的 clean 方法完成的.但是，您需要将 foo_date 和 foo_time 设置为 required=False，因为 clean 仅在每个字段之后调用已经过验证(另见 文档).

This is done with the clean method on the form. You need to set foo_date and foo_time to required=False, though, because clean is only called after every field has been validated (see also the documentation).

class FooForm(forms.Form)
    # your field definitions

    def clean(self):
        data = self.cleaned_data
        if data.get('foo_timestamp', None) or (data.get('foo_date', None) and data.get('foo_time', None)):
            return data
        else:
            raise forms.ValidationError('Provide either a date and time or a timestamp')

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