Spring: как конвертировать JSON-объект с id внешнего ключа вместо объекта

@Entity
@Table(name="auto_devices")
@NamedQuery(name="Device.findAll", query="SELECT d FROM Device d")
public class Device implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@Column(name="adev_id")
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;

	@Column(name="adev_code")
	private BigDecimal code;

	@Column(name="adev_last_config")
	private Timestamp lastConfig;

	@Column(name="adev_model")
	private String model;

	//bi-directional many-to-one association to DeviceType
	@ManyToOne
	@JoinColumn(name="adev_type")
	private DeviceType deviceType;

        // тут всякие геттеры-сеттеры...

	/* Сериализуем как ID */
	@JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
	@JsonIdentityReference(alwaysAsId=true)
	public DeviceType getDeviceType() {
		return this.deviceType;
	}

	public void setDeviceType(DeviceType deviceType) {
		this.deviceType = deviceType;
	}

}

@Entity
@Table(name="auto_device_types")
@NamedQuery(name="DeviceType.findAll", query="SELECT d FROM DeviceType d")
public class DeviceType implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@Column(name="adt_id")
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;

	@Column(name="adt_config")
	@Lob
	@Type(type="org.hibernate.type.StringClobType")
	private String config;

	@Column(name="adt_config_time")
	private Timestamp configTime;

	@Column(name="adt_name")
	private String name;

	//bi-directional many-to-one association to Device
	@OneToMany(mappedBy="deviceType", cascade = CascadeType.REMOVE)
	@JsonIgnore
	private List<Device> devices;

	// тут геттеры-сеттеры

}

[{"id":1,"code":1234567890.00,"lastConfig":null,"model":"TR-200","deviceType":1}]

	@RequestMapping(method = RequestMethod.PUT)
	@ResponseStatus(HttpStatus.OK)
	public void update(@RequestBody Device resource) {
		deviceService.update(resource);
	}