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

问题描述

我是Django（和Python）的新手，我正在试图找出如何对表单验证的某些方面进行条件化。在这种情况下，有一个应用程序的HTML接口，用户可以从窗口小部件中选择日期和时间。表单对象上的 clean 方法采用时间和日期字段的值，并将其重新转换为 datetime 。

除了HTML界面，还有一个iPhone客户端调用应用程序，我想传递UNIX时间戳样式的时间值。 / p>

我的表单代码如下所示：

  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 需要，除非 foo_timestamp

解决方案

这是使用表单上的 clean 方法完成的。您需要将 foo_date 和 foo_time 设置为 required = False 但是，因为 clean 只有在每个字段都被验证之后才被调用（另见文档）。

$ $ $ $ $ $ $ $ $


def clean（self）：
data = self.cleaned_data
如果data.get（'foo_timestamp'，无）或（data.get（'foo_date'，无）和data.get（'foo_time'，无））：
返回数据
else：
raise forms.ValidationError（'提供日期和时间或时间戳'）

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.

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.

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)

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

解决方案

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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