How to manipulate a Json Object before returning to the API

Question

Hello

I have this method in my controller:

@GetMapping(value="/{id}/perfil", produces = MediaType.APPLICATION_JSON_VALUE)
public String carregarPerfilUsuario(@PathVariable("id") Long id, HttpServletResponse response) throws IOException {
     
    obj.put("usuario", ur.findWhereId(id));
    obj.put("postagem", pr.findAllWhereUserId(id));
    
    return gson.toJson(obj);

}

I’m using gson to turn an object into json and JsonOBJECT to create an obj that will be returned at the end:

private static final Gson gson = new Gson();
private static final JSONObject obj = new JSONObject();

however do not know why while converting my data it inserts unwanted attributes into my api:

Map and Myarraylist, I wish I didn’t see those attributes when I convert, like I do?

The result I’m looking for is similar to the image, I just wish I didn’t have these attributes I commented in bold in the question.

Answer 1

Hello,

The methods you are using suggest that you have a Map (put method) and an Arraylist (findAll method), hence your map and your myArrayList.

The correct thing to do is to have a POJO that represents the object to be returned by your API, and populate it with user data and posting.

For example:

public class PostagemDTO {

   private Usuario usuario;
   private List<Postagem> postagens;

   // getters e setters

}

So your API will return the desired result.

I hope it helps!