通过DDD应用程序从REST api返回域模型是否很好？ [英] Is it good to return domain model from REST api over a DDD application?

问题描述

如果要在DDD App的CRUD之上有一个REST层，是否要让REST层吐出域模型（就数据而言）（例如GET）？

If you were to have a REST layer on top of your DDD App for CRUD, would you let the REST layer spit out domain model(in terms of data)(say for a GET)?

推荐答案

通常，您希望能够更改域对象（例如，当您学习有关该域的新知识时），而不必更改系统的公共接口/ API。反之亦然：如果需要对公共接口进行更改，则不必更改域模型。

Generally, you'd want to be able to change your domain objects (for instance when you learn something new about the domain), without having to change a public interface/API to your system. Same thing the other way around: if a change is required to a public interface, you don't want to have to change your domain model.

所以从这个角度来看，我永远不会通过公共接口按原样公开我的域对象。相反，我将创建属于公共接口的数据传输对象（DTO）。这样，对我的域和公共api的更改就可以独立更改。

So from this perspective I'd never expose my domain objects as-is over a public interface. Instead I'd create data transfer objects (DTO) that are part of the public interface. This way, changes to my domain and public api can change independently.

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