def get_isowner(self, comment):
        if not self.context.get('user').is_anonymous():
            return comment.creator == self.context.get('user')
        else:
            return False
Returns True if the user serialising the Comment has created the
dataset/ETHPy150Open ExCiteS/geokey/geokey/contributions/serializers.py/CommentSerializer.get_isowner