Adding field that isn't in model to serializer in Django REST framework

Question

I have a model Comment that when created may or may not create a new user. For this reason, my API requires a password field when creating a new comment. Here is my Comment

Answer 1

If anyone is curious, the solution is to override the restore_object method and add the extra instance variable to the comment object after it has been instantiated:

def restore_object(self, attrs, instance=None):
        if instance is not None:
            instance.email = attrs.get('email', instance.email)
            instance.author = attrs.get('author', instance.author)
            instance.url = attrs.get('url', instance.url)
            instance.content = attrs.get('content', instance.content)
            instance.ip = attrs.get('ip', instance.ip)
            instance.post_title = attrs.get('post_title', instance.post_title)
            instance.post_url = attrs.get('post_url', instance.post_url)
            return instance

        commenter_pw = attrs.get('commenter_pw')
        del attrs['commenter_pw']

        comment = Comment(**attrs)
        comment.commenter_password = commenter_pw

        return comment