django表单：绑定表单的默认值

问题描述：

使用以下格式：

class Form(forms.Form):
    name = forms.CharField(required=False, initial='Hello world')

如果我在视图中执行以下操作：

If I do something like this in the view:

form = Form(request.GET)
if form.is_valid():
    name = form.cleaned_data['name']

然后，即使request.GET不包含name的初始值也会丢失名称作为键。有什么解决方法吗？我希望初始值可以将表格绑定为默认值。

Then initial value of name is lost even if request.GET does not contain name as key. Is there any workaround? I would like initial values work to bound forms as "default values".

答

通过略微修改Gonzalo的解决方案，这是正确的方式：

By slightly modifying Gonzalo's solution, this is the right way:

class Form(forms.Form):
    name = forms.CharField(required=False, initial='Hello world')

    def clean_name(self):
        if not self['name'].html_name in self.data:
            return self.fields['name'].initial
        return self.cleaned_data['name']

如果需要此功能，可以查看django-filter应用程序。我是最近才发现的。

If you need this, you may have a look at django-filter app. I have discovered it quite recently.

django表单：绑定表单的默认值

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