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
     */

}

我不想进行任何迁移

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：由于以下错误，需要迁移： - 已添加类'NoteModel'的主键。 - 已添加属性'NoteModel.id'。

在onCreate方法（MainActivity.java）中发生。

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

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

Answer 1

创建所述配置后，您需要致电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); // <---
    }
}

无法避免io.realm.exceptions.RealmMigrationNeededException

1 个答案: