How can I simply add a link to a Spring Data REST Entity

Question

I have my Entities with Spring Data JPA, but to generate stats about them, I use jOOQ in a Spring @Repository.

Since my methods return either a List of entities, or a Double, how can I expose them as links? Let's say I have a User entity, I want to get the following JSON:

{
  "_embedded" : {
    "users" : [ ]
  },
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/api/users"
    },
    "stats" : {
      "href" : "http://localhost:8080/api/users/stats"
    }
    "profile" : {
      "href" : "http://localhost:8080/api/profile/users"
    }
  },
  "page" : {
    "size" : 20,
    "totalElements" : 0,
    "totalPages" : 0,
    "number" : 0
  }
} 

And in http://localhost:8080/api/users/stats I want to get a list of links with the methods I declared in my jOOQ repository. How would I approach this? Thanks.

Answer 1

https://docs.spring.io/spring-hateoas/docs/current/reference/html/#reference

    public class PaymentProcessor implements RepresentationModelProcessor<EntityModel<Order>> {
        @Override
        public EntityModel<Order> process(EntityModel<Order> model) {
            model.add(
                    Link.of("/payments/{orderId}").withRel(LinkRelation.of("payments")) //
                            .expand(model.getContent().getOrderId()));
            return model;
        }
    }

migrate-to-1.0.changes

ResourceSupport is now RepresentationModel

Resource is now EntityModel

Resources is now CollectionModel

PagedResources is now PagedModel