Spring JSON cast class property to other class dynamically - json

Question

I have an (more) entity, which has a UserEntity class (creator).
Etc:
#Entity
class TestEntity {
#ManyToOne
private UserEntity creator;
}
Now, on UserEntity i have a many field which not important to use it in some request.
And i created a class (UserEntityMiniFied with just important fields) which has a Constructor with UserEntity,
Well, can i solute this question dynamiccaly with one json annotation, i mean,
i try:
#JsonView(UserEntityMinified.class)
private UserEntity creator;
but it not working.
thanks for any help.

Answer 1

I can say you're on the right track.
First – let's go through a simple example – serialize an object with #JsonView.
Here is our view:
public interface JSONView {
interface JSONBasicView {}
interface JSONAdvancedView extends JSONBasicView {}
}
And the UserEntity entity:
#Entity
class UserEntity {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#JsonView(JSONView.JSONBasicView.class)
private int id;
#JsonView(JSONView.JSONBasicView.class)
private String name;
#JsonView(JSONView.JSONBasicView.class)
private String age;
#JsonView(JSONView.JSONAdvancedView.class)
private String country;
#JsonView(JSONView.JSONAdvancedView.class)
private String city;
public UserEntity() {
}
// getter/setter ..
}
And the TestEntity entity:
#Entity
class TestEntity {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#JsonView(JSONView.JSONBasicView.class)
private int id;
#JsonView(JSONView.JSONBasicView.class)
private String name;
#ManyToOne
#JsonView(JSONView.JSONBasicView.class)
private UserEntity userEntity;
public TestEntity() {
}
// getter/setter ..
}
Now let's serialize a TestEntity instance using our view:
public static void main(String[] args) {
UserEntity userEntity = new UserEntity();
userEntity.setId(1);
userEntity.setName("User Entity Name");
userEntity.setAge("33");
userEntity.setCountry("Country");
userEntity.setCity("City");
TestEntity testEntity = new TestEntity();
testEntity.setId(1);
testEntity.setName("Test Entity Name");
testEntity.setOtherTestEntity(userEntity);
ObjectMapper mapper = new ObjectMapper();
mapper.disable(MapperFeature.DEFAULT_VIEW_INCLUSION);
String basicView = mapper
.writerWithView(JSONView.JSONBasicView.class)
.writeValueAsString(testEntity);
System.out.println(basicView);
String advancedView = mapper
.writerWithView(JSONView.JSONAdvancedView.class)
.writeValueAsString(testEntity);
System.out.println(advancedView);
}
The output of this code will be:
// JSONBasicView
{
"id": 1,
"name": "Test Entity Name",
"userEntity": {
"id": 1,
"name": "User Entity Name",
"age": "33"
}
}
// JSONAdvancedView
{
"id": 1,
"name": "Test Entity Name",
"userEntity": {
"id": 1,
"name": "User Entity Name",
"age": "33",
"country": "Country",
"city": "City"
}
}
You can also check here to do more.