Explained [how to model has_many relationships in DynamoDB](https://blog.codeship.com/modeling-has_many-relationships-with-dynamodb/) with Rails in my latest article.
"Coming from a strong SQL background and being a fan of using ORM such as Active Record, adapting to the NoSQL mindset gave me an opportunity to rethink and explore the capabilities of NoSQL. But soon I realized that normalization is not always the right choice in the case of NoSQL databases. And more important, handling relations is a bit different."
Hope this article helps and please share your feedback and how you handle the relationships in DynamoDB.