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<p><span>Hey guys, </span></p><p><span><br></span></p><p><span>How do you manage data mapping in DDD?</span></p><p>To me, to follow DDD principles, we'd need to do the following:</p><p><ul class=""><li>clients have their own DTO, to represent the data in their level</li><li>clients do NOT work with domain objects such entities, aggregates ... domain model, in general;</li><li>clients call, via controllers/application services, the domain services from the domain</li><li>domain services talk to repositories, and both work with the domain model</li><li>repository definition belongs to the domain layer, but implementation belongs to infrastructure;</li><li>repository implementation need mappers to convert from domain model to DTO and vice-versa;</li></ul><div>Some consequences of the
DDD are that, in the domain model, I'd never put JPA annotations (and any other infrastructure-related stuff). DTOs, in the infrastructure layer, would be the classes that are actually mapped with such a thing. </div><div><br></div><div>But then we need data mapping between client and domain and also domain and infrastructure. </div><div>Where do you usually put it? Would it be kind of separate modules such as:</div><div><ul><li>a module (separate library) that maps client DTO's to domain objects, and the model depends on it;</li><li>a module (separate library) that maps domain objects to infrastructure (example: DB) model and vice-versa, and the infrastructure depends on it (repository implementation receives domain objects as parameters, convert them or build whateve
r query it needs, persist/fetch data and, eventually, converts data back to domain objects to return to the caller);</li></ul><div>That's the only way I can think of, preserving the DDD principles. </div><div>Doing so, we kinda preserve domain talking about domain, infra talking about data, no 'infra-related' configuration on domain objects, and also no clients speaking in the domain terms. </div><div><br></div><div>What do you think? How do you play with data mapping? </div><div>By the way, do you agree with my words?</div><div><br></div><div>Cheers, </div><div>Pedro</div></div>
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