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I’ve designed a domain model following DDD methodology. I would like to add validation.
Do you think adding validation at the domain model level is a good idea? If no, where should I validate my domain objects?
Thanks
If the validation rules form part of the business domain, they belong in the model.
An aggregate root is responsible of maintaining the invariants encompassed by it, so validating them falls under its responsibility.
If you find that the validation rules are very complex, you can create a validation service that will be used by the aggregate root for this function.