How to serialize only the ID of a child with Jackson

by

There are couple of ways. First one is to use @JsonIgnoreProperties to remove properties from a child, like so:

public class Parent {
   @JsonIgnoreProperties({"name", "description" }) // leave "id" and whatever child has
   public Child child; // or use for getter or setter
}

another possibility, if Child object is always serialized as id:

public class Child {
    // use value of this property _instead_ of object
    @JsonValue
    public int id;
}

and one more approach is to use @JsonIdentityInfo 

public class Parent {
   @JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
   @JsonIdentityReference(alwaysAsId=true) // otherwise first ref as POJO, others as id
   public Child child; // or use for getter or setter

   // if using 'PropertyGenerator', need to have id as property -- not the only choice
   public int id;
}

which would also work for serialization, and ignore properties other than id. Result would not be wrapped as Object however.

More Related Contents:

  1. Get NPE reading null object field when deserializing using Jackson [closed]
  2. How do I use a custom Serializer with Jackson?
  3. Why when a constructor is annotated with @JsonCreator, its arguments must be annotated with @JsonProperty?
  4. Jackson: How to add custom property to the JSON without modifying the POJO
  5. Jackson ObjectMapper – specify serialization order of object properties
  6. Jackson – How to process (deserialize) nested JSON?
  7. Jackson databind enum case insensitive
  8. What is the JSON View class in Jackson and how does it work?
  9. Ignore missing properties during Jackson JSON deserialization in Java
  10. Jackson is not deserialising a generic list that it has serialised
  11. Jackson JSON custom serialization for certain fields
  12. Use class name as root key for JSON Jackson serialization
  13. Jackson JSON serialization, recursion avoidance by level defining
  14. Json deserialization into other class hierarchy using Jackson
  15. Custom Jackson Serializer for a specific type in a particular class
  16. Jackson custom annotation for custom value serialization
  17. Jackson Serialize Instant to Nanosecond Issue
  18. Jackson deserialize based on type
  19. Jackson – Deserialize using generic class
  20. Date format Mapping to JSON Jackson
  21. Deserialize JSON with Jackson into Polymorphic Types – A Complete Example is giving me a compile error
  22. Jackson JSON Deserialization with Root Element
  23. Jackson + Builder Pattern?
  24. JPA Transient Annotation and JSON
  25. Removing JSON elements with jackson
  26. Jackson conditional @JsonUnwrapped
  27. Jackson @JsonProperty(required=true) doesn’t throw an exception
  28. JSON to JSON transformer
  29. Jsonpath with Jackson or Gson
  30. How to use @JsonIdentityInfo with circular references?

Leave a Comment