Why is the command not finding the attribute?

Question

Django

I'm trying to get additional fields.

a = Article.objects.get(id = article_id)
  a.articleadd_set.all()

But django says it didn't find the articleadd_set attribute.
The model name is ArticleAdd. with relation OneToOneField to Article
How do I know if I wrote the model correctly or if any additional field is assigned to Article. to know where I made a mistake.

Answer 1

If the relation is one to one, then the reverse relation will be without _set.
PS Very strange name for the ArticleAdd model.