serializers.py 文件源码

def validate_parent(self, value):
        # Validate parent cannot be changed
        if self.instance and value != self.instance.parent:
            raise serializers.ValidationError("Parent cannot be changed for an existing Content instance.")
        # Validate user can see parent
        if not self.instance and value:
            request = self.context.get("request")
            if not value.visible_for_user(request.user):
                raise serializers.ValidationError("Parent not found")
        return value