我有两个Realm对象,Ticket和Message。
public class Ticket extends RealmObject {
@PrimaryKey
private Long id;
private RealmList<Message> messages;
}
public class Message extends RealmObject {
@PrimaryKey
private Long id;
private String text;
private boolean read;
}
我想要返回至少有一条未读消息的票数。在此示例方案中,将计算故障单1和3,但不会计算故障单2,因为已读取这两个消息:
Ticket 1
- Message 1: Read
- Message 2: Unread
Ticket 2
- Message 1: Read
- Message 2: Read
Ticket 3
- Message 1: Unread
- Message 2: Unread
这是否可以在领域中使用嵌套查询?
答案 0 :(得分:3)
我认为你在寻找的是
MapDifference<String, String> mapDifference = Maps.difference(currValue, previousValue);
return !mapDifference.entriesOnlyOnLeft().isEmpty()
|| !mapDifference.entriesDiffering().isEmpty();
有关详细信息,请访问Link Queries