Implementing Domain-Driven Design

Persisting Value Objects

There are a variety of ways to persist Value Object instances to a persistent store. In a general sense it involves serializing the object to some text or binary format and saving it to disk. However, since we are not concerned with persisting individual Value instances on their own, I won’t be focusing on general-purpose persistence. Rather, we are more interested in persisting Values along with the state of the Aggregate instances that contain them. The following approaches assume that a parent Entity ultimately holds references to the Value instances that get persisted. All of the following examples are based on the assumption that an Aggregate is being added to or read from its Repository (12), and its contained ...