serializers.py 文件源码

def get_initial(self):
        form_class = self.form_class
        if not form_class:
            return super(FormMixin, self).get_initial()

        # We need a fresh instance to get initial values
        form = form_class(
            instance=self.instance if isinstance(self.instance, Model) else None
        )
        res = OrderedDict()
        for field_name, field in form.fields.items():
            if field.initial:
                res[field_name] = self.fields[field_name].to_representation(
                    field.initial
                )
        return res