Django：显示NullBooleanField为Radio，默认为None [英] Django: Display NullBooleanField as Radio and default to None

问题描述

我以几种方式成功实现了 NullBooleanField 作为单选按钮，但问题是我无法将默认值设置为无。



这里是代码：

I am successfully implementing NullBooleanField as radio buttons in several ways but the problem is that I can not set the default value to None.

Here is the code:

models.py:
class ClinicalData(models.Model):
      approved = models.NullBooleanField()
      ...

forms.py:
NA_YES_NO = ((None, 'N/A'), (True, 'Yes'), (False, 'No'))
class ClinicalDataForm(ModelForm):
      approved = forms.BooleanField(widget=forms.RadioSelect(choices=NA_YES_NO))
      class Meta:
           model = ClinicalData 

我尝试了以下方法：
在模型和/或设置中设置默认值：无 inital：无在表单中，也在表单实例的视图中。

没有一个是成功的。 Im目前使用 CharField 而不是 NullBooleanField 。
但是有一些方法可以用 NullBooleanField ???

I tried the following methods: Set default:None in the model and/or setting inital:None in the form and also in the view in the form instance.
None of that was successfull. Im currently using CharField instead of NullBooleanField.
But is there some way to get this results with NullBooleanField???

推荐答案

由于某些奇怪的原因 - 我没有在Django代码中检查它，只要您为NullBooleanField提供自定义窗口小部件，它不接受您期望的值（无， True 或 False ）

For some odd reason - I didn't check it at the Django code -, as soon as you provide a custom widget for a NullBooleanField, it doesn't accept the values you expect (None, True or False) anymore.

通过分析内置的选择属性，我发现这些值分别等于 1 ， 2 和 3 。

By analyzing the built-in choices attribute, I found out that those values are equal to, respectively, 1, 2 and 3.

所以，这是我遇到的快速肮脏的解决方案粘贴默认的单选按钮：

So, this is the quick-and-dirty solution I fould to stick to radio buttons with 'Unknown' as default:

class ClinicalDataForm(forms.ModelForm):
    class Meta:
        model = ClinicalData

    def __init__(self, *args, **kwargs):
        super(ClinicalDataForm, self).__init__(*args, **kwargs)
        approved = self.fields['approved']
        approved.widget = forms.RadioSelect(
            choices=approved.widget.choices)
        approved.initial = '1'

它看起来不好，除非非常必要，否则我不会使用它。但是，就是这样，以防万一。

It doesn't look good and I wouldn't use it unless very necessary. But there it is, just in case.

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