What are the two techniques for validating a domain model? Describe them. The topic is Object Orient Program
We can divide the validation of the Domain Model into two types based on scope – Aggregates scope and Bounded Context scope
Aggregates scope
Each Aggregate forms a transactional consistency boundary. This
means that within a single
Aggregate, all composed
parts must be consistent, according to business rules, when
the controlling
transaction is committed to the database.
So in context of Aggregates scope, we need to protect the invariants by executing validation during our use case (business operation) processing.
Bounded Context scope
Unfortunately, validation of Aggregates invariants is not enough. Sometimes the business rule may apply to more than one Aggregate (they can be even aggregates of different types).
For example, assuming that we have Customer Entity as Aggregate Root, the business rule may be “Customer email address must be unique”. To check this rule we need to check all emails of Customers which are separated Aggregate Roots. It is outside of the scope of one Customer aggregate. Of course, supposedly, we could create new entity called CustomerCatalog as Aggregate Root and aggregate all of the Customers to it but this is not good idea for many reasons.
What are the two techniques for validating a domain model? Describe them. The topic is Object...
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