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

Thanks for your own answer, it helped me a lot :)

But I think this is a bit more generic, since I still want to call the method on the super serializer class

def restore_object(self, attrs, instance=None):
    '''
    we have to ensure that the temporary_password is attached to the model
    even though it is no field
    '''
    commenter_pw = attrs.pop('comment_pw', None)
    obj = super(
        CommentCreateSerializer, self
    ).restore_object(attrs, instance=instance)
    if commenter_pw:
        obj.commenter_pw = commenter_pw
    return obj