如何从 Hive box 对象中获取 key 并将其映射到对象的特定字段？

Question

框自动递增。

假设我有一个这样的对象：

@HiveType(...)
class Dummy {
  
  @HiveField(0)
  int id;

  @HiveField(1)
  String name;

}

我希望 Hive 反序列化将 Dummy 对象的键映射到 id 字段。

Answer 1

如果您从 HiveObject 继承了 class，那么您可以使用内置的属性 'key'。

    @HiveType(...)
    class Dummy extends HiveObject{
      //id not needed anymore
   
      @HiveField(0)
      String name;
    
    }
    
    ...
    
    Box<Dummy> db = Hive.box<Dummy>('dummy');
    Dummy dummy = Dummy(name: "some text");
    db.add(dummy); //add assigns next integer as key

    //after storing object to a database, you can access its key using 'key' property
    int id = dummy.key;

    //another advantage of extending HiveObject, is that you can store or delete object from the database without accessing the box:
    dummy.name = "other text";
    dummy.save(); //put modified object into box
    dummy.delete(); //delete object from the database

如何从 Hive box 对象中获取 key 并将其映射到对象的特定字段？

How to get key from Hive box object and map it to specific field of the object?

database

flutter

flutter-hive