class Article(models.Model):
    author = models.ForeignKey(Author)
    title = models.CharField(max_length = 100)

(assume an article can have only one author)

article = Article.objects.get(title="Django is awesome)

if I need only author id, I can access author id as 1)
article.author_id or 2) article.author.id

I prefer first article.author_id as it requires less db lookup and
hence better performance.

Any reason to use 2nd way over 1st.

( I understand this approach only works for id and not for say author
name)

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