如何使用Spring Data Rest在GET调用中获取EmbeddedId对象

Question

I am using Spring 1.3.3 and I am unable to get the associated object for embedded class using GET. It returns the URI instead of object while using projection.

   {
      "employeeId": {
        "empId": 4,
        "_links": {
          "address": {
            "href": "http://localhost:8082/address/1"
          },
          "zipcode": {
            "href": "http://localhost:8082/zipcode/2"
          }
        }
      },
      "empId": 4,
      "name": "ap",

    },
    "_links": {
      "self": {
        "href": "http://localhost:8082/employee/com.blah.blah.Employee@64f11498"
      },
      "adNetworkParam": {
        "href": "http://localhost:8082/employee/com.blah.blah.EmployeeId@64f11498{?projection}",
        "templated": true
      },
      "demandSource": {
        "href": "http://localhost:8082/employee/com.blah.blah.EmployeeId@64f11498/address"
      },
      "targetCharacteristic": {
        "href": "http://localhost:8082/employee/com.blah.blah.EmployeeId@64f11498/zipcode"
      }
    }
  }

My domain classes as follows..

Employee.java

@Entity

@Table(name = "employee")
public class Employee implements Serializable {
    private EmployeeId employeeId;
    private Address address;
    private Zipcode zipcode;
    private int empId;
    private String name;

    //getter
    ...
    @MapsId("address")
    @ManyToOne
    @JoinColumn(name = "address_id")
    public Address getAddress() {
        return address;
    }

    @MapsId("zipcode")
    @ManyToOne
    @JoinColumn(name = "zipcode_id")
    public Zipcode getZipcode() {
        return zipcode;
    }

    // setter
    .....

Address.java

@Entity
@Table(name="address")
public class Address implements Serializable {
    private int id;
    private String streetName;
    private String cityName

Zipcode.java

@Entity
@Table(name = "zipcode")
public class Zipcode implements Serializable {
    @Id
    @GeneratedValue
    private int id;
    private String code;

EmployeeId.java

@Embeddable
public class EmployeeId implements Serializable {
    private Address address;
    private Zipcode zipcode;
    private int empId;

My Projection is as follows,

@Projection(name = "employeeProjection", types = { Employee.class })
public interface EmployeeProjection {

    Address getAddress();

    Zipcode getZipcode();

    int getEmpId();

    String getName();
}

Employee Search repository class as follows,

@RepositoryRestResource(excerptProjection = EmployeeProjection.class)
interface EmployeeRepository extends CrudRepository<Employee, EmployeeId> {
    List<Employee> findByNameContaining(@Param("name") @RequestParam("name") String name);

    Employee findById(@Param("employeeId") @RequestParam("employeeId") Integer employeeId);

} 

How to return associated object instead of URI for embedded class??

Kindly provide your inputs.

Answer 1

You should use excerpts in your repository definition. I can guess according to your GET result, that the Employee repository is as following:

interface EmployeeRepository extends CrudRepository<Employee, EmployeeId> {}

Change it as following:

@RepositoryRestResource(excerptProjection = EmployeeProjection.class)
interface EmployeeRepository extends CrudRepository<Employee, EmployeeId> {} 

This will cause to zipCode and address to be inlined. Note, that links to inlined resources will still appear in the projection.

The employee model should be modified and to be defined with @OneToOne annotation above embedded members:

@Table(name = "employee")
public class Employee implements Serializable {
    private EmployeeId employeeId;
    @OneToOne
    private Address address;
    @OneToOne
    private Zipcode zipcode;
    private int empId;
    private String name;

You can read more in spring doc .