Domain Model is a Magical Bag that Validates the Business Rules

Domain Model is a Magical Bag that Validates the Business Rules

In Queries, Repositories give data back in Domain Obj, this data is then filtered and filled in the Model, in controllers, further this Model is augmented with View specific info and we get the ViewModel. That is finally rendered on the View. Behavior or Domain Logic part of the Domain Model is not involved in the fetch operations. We just treat the Hydrated Domain Obj as the Data Bags. We do not execute the business logic inside the Domain Logic.

But in Commands, we hydrated Models from ViewModels, we hydrate Domain Obj. from the Models. During this, we may fetch data from the DB. When Domain Obj. are Hydrated, we executed Domain Logic against them.

Hydrated Domain Obj. ç Request Data + Data fetched form DB

When Hydrated, now the Domain Model has become a Magical Bag, we call method and tell whether the information given is valid or not. We can infer information about the Data Provided. Business Rules are applied on these Hydrated Domain Obj and we get results from it. These Results help us to do different operations on the Data. We send email, archive data, send message to another application, we can generated more data to be inserted.