Migrate ResourceSupport to RepresentationModel

I have this code which I would like to migrate to latest Spring hateoas version. I tried this:

@JsonInclude(Include.NON_NULL)
public class TransactionResource extends RepresentationModel {

  @JsonProperty("id")
  private UUID uuid;

  public void setUuid(UUID uuid) {
    // Remove the hateoas ID (self referential link) if exists
    if (getId() != null) {
      getLinks().remove(getId());
    }

    add(linkTo(methodOn(TransactionController.class).lookup(uuid, null))
        .withSelfRel()
        .expand());

    this.uuid = uuid;
  }
  ......................
}

I get error Cannot resolve method 'getId' in 'TransactionResource' and Cannot resolve method 'remove' in 'Links'

Do you know how I have to fix this issue?

Solution

I think that in the newer Spring Hateoas version you could achieve a similar result with this code:

@JsonInclude(Include.NON_NULL)
public class TransactionResource extends RepresentationModel {

  @JsonProperty("id")
  private UUID uuid;

  public void setUuid(UUID uuid) {
    // Remove the hateoas ID (self referential link) if exists
    if (this.hasLink(IanaLinkRelations.SELF)) {
      this.getLinks().without(IanaLinkRelations.SELF);
    }

    add(linkTo(methodOn(TransactionController.class).lookup(uuid, null))
        .withSelfRel()
        .expand());

    this.uuid = uuid;
  }
  ......................
}

I haven't tested it but probably the above code could be simplified like this:

@JsonInclude(Include.NON_NULL)
public class TransactionResource extends RepresentationModel {

  @JsonProperty("id")
  private UUID uuid;

  public void setUuid(UUID uuid) {
    // Remove the hateoas ID (self referential link) if exists
    this.getLinks().without(IanaLinkRelations.SELF);

    add(linkTo(methodOn(TransactionController.class).lookup(uuid, null))
        .withSelfRel()
        .expand());

    this.uuid = uuid;
  }
  ......................
}

Note that the main changes are related to the use of the methods provided in RepresentationModel and in the Links.

As I told, please, be aware that I haven't tested the code. My main concern has to do with the fact that this.getLinks().without(IanaLinkRelations.SELF); return a new Links instance and it may not replace in place the existing ones associated with the RepresentationModel, so you probably would need to merge the results. Please, take that into account.