CODEWITHSUNDEEP
androidgsonrealm
Marko Stojanovic
Marko Stojanovic

Reputation: 95

Deserialize a Realm object containing other Realm objects with GSON?

I have an entity, Employee:

public class Employee extends RealmObject implements Serializable {
    @PrimaryKey
    @SerializedName("id") public long id;

    @SerializedName("name") public String firstName;
    @SerializedName("lastName") public String lastName;
    @SerializedName("profilePictureSmall") public String profilePictureSmallUrl;
    @SerializedName("contact") public Contact contact;
}

public class Contact extends RealmObject implements Serializable {
    @PrimaryKey
    @SerializedName("id") public long id;

    @SerializedName("workMail") public String workEmail;
    ... Some other fields ...
}

When deserializing Employee from json, all String fields and long field are deserialized properly, but my contact field is left null.

I've tried writing a custom deserializer for Employee:

public class DeserializeEmployee implements JsonDeserializer<Employee> {
    @Override
    public Employee deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        Log.d(TAG, "Deserializing Employee");
        Employee employee = new Employee();
        JsonObject o = json.getAsJsonObject();
        employee.id = o.get("id").getAsLong();
        employee.firstName = o.get("name").getAsString();
        employee.lastName = o.get("lastName").getAsString();
        employee.profilePictureSmallUrl = o.get("profilePictureSmall").getAsString();
        employee.contact = context.deserialize(o.get("contact"), Contact.class);
        return employee;
    }
}

and a custom deserializer for Contact:

public class DeserializeContact implements JsonDeserializer<Contact> {
    @Override
    public Contact deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        Log.d(TAG, "Deserializing Contact");
        Contact contact = new Contact();
        JsonObject o = json.getAsJsonObject();
        contact.id = o.get("id").getAsLong();
        contact.workEmail = o.get("workMail").getAsString();
        return contact;
    }
}

I've also registered them both: 

Gson gson = new GsonBuilder()
                .registerTypeAdapter(Date.class, (JsonSerializer<Date>) (src, typeOfSrc, context) -> new JsonPrimitive(src.getTime()))
                .registerTypeAdapter(Date.class, (JsonDeserializer<Date>) (json, typeOfT, context) -> new Date(json.getAsJsonPrimitive().getAsLong()))
                .registerTypeAdapter(Contact.class, new DeserializeContact())
                .registerTypeAdapter(Employee.class, new DeserializeEmployee())
                .create();

My Employee deserializer is called and its primitive fields are set properly, but my Contact deserializer isn't called at all, and field contact is therefore null.

JSON:

{
  "id": 5,
  "name": "John",
  "lastName": "Doe",
  "profilePictureSmall": "http://example.com/fjlsjf",
  "contact": {
     "id": 9,
     "workMail": "[email protected]"
  }
}

Edit Added sample json if somebody needs, but pretty sure it isn't the problem.

Upvotes: 0

Views: 422

Answers (2)

Marko Stojanovic
Marko Stojanovic

Reputation: 95

I was sending wrong JSON from the server, which didn't include contact field. When I've actually sent proper data, everything worked, even without custom deserializers. Sorry for wasting everyone's time.

Upvotes: 1

Elvis Chidera
Elvis Chidera

Reputation: 201

Try doing this:

employeeObject = realm.copyFromRealm(employeeObject);

Upvotes: 0

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