如果Jackson决定使用ObjectIdentity作为输出，则更改JSON属性名称

Question

Given a class

@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class User {
  public int id;
  public User other;
}

If Jackson matches a previously seen User object, it will use the ObjectIdGenerator to output the id instead of the actual object.

An example output:

{
  "id": 1257,
  "other" : {
    "id": 411,
    "other": 1257   
  }  
}

However, I'd like to use a different property name if the object id is triggered, so the output looks like

{
  "id": 1257,
  "other" : {
    "id": 411,
    "otherRef": 1257   
  }  
}

Will a custom serializer achieve this? I can find plenty of examples where the property value is changed by a custom serializer, but none where the property name is changed based on the property value.

Answer 1

You could use a @JsonGetter to do this. Mark the field with @JsonIgnore and then create a method with the name getOtherRef marked with @JsonGetter .