Realm, GSON and primitive JSON arrays

DataParser

//parsing with help of gson without storing via realm
UserInfo userInfo = (UserInfo)Utils.deserialize(userInfoJsonObject.toString(),new TypeToken<UserInfo>(){}.getType());

//save data using realm
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
realm.createOrUpdateObjectFromJson(UserInfo.class, userInfoJsonObject);
realm.commitTransaction();
realm.close();

UserInfo.java

public class UserInfo extends RealmObject {

  @PrimaryKey
  private Integer id;

  @JsonAdapter(Utils.ArrayToStringTypeAdapter.class)
  private String hobbies;

}

UserInfo.json

{
  "id": 1,
  "hobbies": [
    "singing",
    "dancing",
    "coding"
  ]
}

Utils.java

public class Utils {
  
  public static Gson getGson(){
    Gson gson = new GsonBuilder()
            .setLenient()
            .setExclusionStrategies(new ExclusionStrategy() {
              @Override
              public boolean shouldSkipField(FieldAttributes f) {
                return f.getDeclaringClass().equals(RealmObject.class);
              }

              @Override
              public boolean shouldSkipClass(Class<?> clazz) {
                return false;
              }
            })
            .create();
    return gson;
  }
  

  public static String serialize(Object object) {
    return getGson().toJson(object);
  }

  public static Object deserialize(String objectString, Type type) {
    return getGson().fromJson(objectString, type);
  }


  public static class ArrayToStringTypeAdapter extends TypeAdapter<String> {

    @Override
    public void write(JsonWriter out, String value) throws IOException {
      out.value(String.valueOf(value));
    }

    @Override
    public String read(JsonReader in) throws IOException {
      String data = "";
      boolean isArray = (in.peek()== JsonToken.BEGIN_ARRAY)?true:false;

      if(isArray){
        in.beginArray();
        while (in.hasNext()) {
          data = data + in.nextString() +",";
        }
        if(data.endsWith(",")){
          data = data.substring(0,data.length()-1);
        }
        in.endArray();
      }
      else{
        data = in.nextString();
      }

      return data;
    }
  };

}

Hi, Thanks for the trick.

I have an object like above one, but instead of String array, it is like jsonArray. I want to store that as a string to the realm. Have a look at below JSON structure for same.

{
  "id": "aadessddsdss9bdfs69c-6f13-4417-b356-230dbb36c887",
  "propertyId": "49bbe89e-8709-4e0f-a680-3c73aa36e424",
  "rowId": "zzzadsaaedsd3fsdfsss33a-11fc-4396-8c69-d88001e813c5",
  "jobFormsId": "",
  "observation": [
    {
      "FieldId": "ddbaesds33fsdf13a-11fc-4396-8c69-d88001e813c5",
      "Value": "sfshello"
    },
    {
      "FieldId": "e88dddfssdc4s7c4-73bc-45ba-900f-bf5286036003",
      "Value": "ritika"
    },
    {
      "FieldId": "b2ea8sdsdsfssdc144-812d-47a2-9239-8471558df189",
      "Value": "May"
    }
  ]
}

I have made Class like below: (Here I want to store observations as String to realm)
AdditionalData.java

public class AdditionalData extends RealmObject {
    @PrimaryKey
    private String id;
    private String jobFormId;
    private String propertyId;
    private String observations;
    private String rowId;
    
    public AdditionalData() {
        // Empty constructor
    }
}

Now, when trying to store AdditionalData to the realm, it is not storing observations in the formate it is right now. Can you please help me here to resolve this query.

Thanks.