oznus

 Realm realm = Realm.getInstance(context).executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                realm.copyToRealm(user);
            }
        });

oznus

public class Email extends RealmObject {

    @PrimaryKey
    private String address;

    .....
}

oznus

 Realm realm = Realm.getInstance(context);
 realm.beginTransaction();
 realm.copyToRealmOrUpdate(user);
 realm.commitTransaction();

oznus

public class User extends RealmObject {

    private String userName;
    private String imageUrl;
    private String status;

    private RealmList<Email> emailList;
    //getters and setter
    .....
}

oznus

public class User extends RealmObject {
 
    @PrimaryKey
    private int userId;
    
    private String description;
    private String sureName;
    private String name;
    
    private RealmList<Address> addresses;

oznus

User user = new User();
user.setName("Justin");
user.setSurname("Timberlake");
                
Realm realm = Realm.getInstance(getActivity());

realm.beginTransaction();
realm.copyToRealm(user);
realm.commitTransaction();

oznus

public class User extends RealmObject {

    @PrimaryKey
    private int userId;
    
    private String description;
    private String sureName;
    private String name;
    
        public String getDescription() {

oznus

String documentId = userDocument.getId();
Document document =  database.getDocument(documentId);
List<String> emails = (List<String>) document.getProperty("emails");
        

oznus

      Document userDocument = database.createDocument();
        List<String> emails = new ArrayList<String>() {{
                add("some_mail_1@gmai.com");
                add("some_mail_2@gmai.com");
            }
        };

        Map<String, Object> userMapper = new HashMap<>();
        userMapper.put("name", "Justin");
        userMapper.put("sureName", "Timberlake");

oznus

public void initDB(Context context) {
        try {
            Manager manager = new Manager(new AndroidContext(context), Manager.DEFAULT_OPTIONS);
            
            if (!Manager.isValidDatabaseName(DBName)) {
                throw new RuntimeException("Bad database name");
            }
            
           database = manager.getDatabase(DBName);
        } catch (IOException e) {