Java spring boot: include nested object property in nesting object

Question

In one of my REST(-ish) controller methods i receive a json body like the following:

{
  id: 123,
  otherId: 456,
  // ... other properties
}

I want to automatically map this to a class with the following structure

class Foo {
  int id;
  Bar otherId;
  // ...
}

where Bar is

class Bar {
  int id;
}

So what i want to do is map otherId to id within otherId.id (Bar.id) and simply change my method signature to.

@RequestMapping(...)
public void doThat(@RequestBody @Valid Foo)

Are there any Annotations that can do this for me or do i have to write a wrapping method myself, etc? Is this possible the way i hope it is?

Regards

PatrickChen · Accepted Answer · 2020-05-14 13:52:02Z

1

You can use the annotation @JsonDeserialize to create your own deserializer like this:

class Foo {
  int id;
  @JsonDeserialize(using = CustomDateDeserializer.class)
  Bar otherId;
  // ...
}

public class CustomDateDeserializer extends StdDeserializer<Bar> {
@Override
    public Item deserialize(JsonParser jp, DeserializationContext ctxt) 
      throws IOException, JsonProcessingException {
        JsonNode node = jp.getCodec().readTree(jp);
        int id = (Integer) ((IntNode) node.get("id")).numberValue();
        String itemName = node.get("itemName").asText();

        return new Item(id, itemName, new Bar(id));
    }
}

Hope it helps

edited May 14, 2020 at 13:52

answered May 14, 2020 at 11:00

PatrickChen

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2 Comments

Velulian Over a year ago

Can you change your code to use @JsonDeserialize and extend StdDeserializer for upcoming help-seekers please? Because this is about JSON->Object

PatrickChen Over a year ago

Ok, sorry, no problem.

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