android - 无法避免 io.realm.exceptions.RealmMigrationNeededException

Question

我想在我的模型中添加新字段

public class NoteModel extends RealmObject {
    @PrimaryKey
    private int id; //new field
    private String note;
    private String header;
    private Date date;
    /*
     * few getters and setters
     */

}

我不想做任何迁移

public class BaseApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Realm.init(this);
        //if I'm right it's delete all data from db and change it's schema (that's OK for me)
        RealmConfiguration config = new RealmConfiguration.Builder()
                .deleteRealmIfMigrationNeeded()
                .build()
    }
}

但我仍然遇到异常 io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors: - 添加了“NoteModel”类的主键。 - 添加了属性“NoteModel.id”。

它发生在 onCreate 方法 (MainActivity.java) 中。

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
realm = Realm.getDefaultInstance();      //error right here

我应该怎么做？ 从这里获取信息:"realm migration needed", exception in android while retrieving values from realm db

Answer 1

创建上述配置后，您需要调用 Realm.setDefaultConfiguration(config)。

public class BaseApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Realm.init(this);
        RealmConfiguration config = new RealmConfiguration.Builder()
                .deleteRealmIfMigrationNeeded()
                .build()
        Realm.setDefaultConfiguration(config); // <---
    }
}