Sam-Kruglov

@RepositoryRestController
public class UserController {
    
    private final RepositoryEntityLinks links;
    private final UserRepository userRepository;
    
    // all arg constructor
    
    @GetMapping("users/search/username")
    public ResponseEntity<Resource<UserUsername>> addLinksToUserUsername(@RequestParam("id") Long id){

Sam-Kruglov

{
    "_links": {
        "getUsername": {
            "href": "http://localhost:8080/users/search/username{?id}",
            "templated": true
        },
        "self": {
            "href": "http://localhost:8080/users/search"
        }
    }

Sam-Kruglov

{
    "username": "jsmith",
    "firstName": "John",
    "lastName": "Smith",
    "_links": {
        "self": {
            "href": "http://localhost:8080/users/1"
        },
        "user": {
            "href": "http://localhost:8080/users/1"

Sam-Kruglov

{
    "username": "jsmith"
}

Sam-Kruglov

public interface UserRepository extends CrudRepository<User, Long> {
    
    @RestResource(path = "username", rel = "getUsername")
    UserUsername findUsernameById(@Param("id") Long id);
}

Sam-Kruglov

/**
 * Only defines a {@link com.samkruglov.entities.User#username username}.
 */
public class UserUsername {
    
    private final String username; // getter & consctuctor
        
    // equals & hashcode
}

Sam-Kruglov

{
  "name": "A",
  "_links": {
    "self": {
      "href": "http://localhost:8080/groups/1"
    },
    "group": {
      "href": "http://localhost:8080/groups/1"
    },
    "users": {

Sam-Kruglov

{
  "_links" : {
    "groups" : {
      "href" : "http://localhost:8080/groups"
    },
    "users" : {
      "href" : "http://localhost:8080/users"
    },
    "profile" : {
      "href" : "http://localhost:8080/profile"

Sam-Kruglov

public interface GroupRepository extends CrudRepository<Group, Long> {}

Sam-Kruglov

public interface UserRepository extends CrudRepository<User, Long> {}