validation.py 文件源码

def form_args(self, bundle):
        data = bundle.data

        # Ensure we get a bound Form, regardless of the state of the bundle.
        if data is None:
            data = {}

        kwargs = {'data': {}}

        if hasattr(bundle.obj, 'pk'):
            if issubclass(self.form_class, ModelForm):
                kwargs['instance'] = bundle.obj

            kwargs['data'] = model_to_dict(bundle.obj)

        kwargs['data'].update(data)
        return kwargs