def get_comments_for_article(article_id, repo: AbstractRepository):
article = repo.get_article(article_id)
if article is None:
raise NonExistentArticleException
return comments_to_dict(article.comments)
def get_article(article_id: int, repo: AbstractRepository):
article = repo.get_article(article_id)
if article is None:
raise NonExistentArticleException
return article_to_dict(article)
