根据计数列表过滤领域对象<t>

Question

我正在尝试根据匹配对象的数量查询一个类。但是，我一直在跟踪错误'Unable to parse the format string "matches.@count > 0"'。我已经尝试过以下文档中的代码，但这无济于事。我想要获得所有联赛的0场以上比赛？

类

class League:Object {
    dynamic var id: Int = 0
    dynamic var name: String? = ""
    var matches = List<Match>()


    override class func primaryKey() -> String {
        return "id"
    }
}

class Match:Object {
    dynamic var matchId: Int = 0
    dynamic var date: NSDate = NSDate()
    dynamic var homeName: String? = ""
    dynamic var awayName: String? = ""
    dynamic var homeAcro: String? = ""
    dynamic var awayAcro: String? = ""
    dynamic var awayScore: Int = 0
    dynamic var homeScore: Int = 0
    dynamic var leagueName: String? = ""
    dynamic var homeLogo: NSData = NSData()
    dynamic var awayLogo: NSData = NSData()

    override class func primaryKey() -> String {
        return "matchId"
    }

}

尝试过的代码

let realm = try! Realm()
let predicate = NSPredicate(format: "matches.@count > 0")
menuArray = realm.objects(League).sorted("id").filter(predicate)

Answer 1

MATCHES是一个保留字在NSPredicate语法。您可以在保留字前面加上a #来转义，例如：

let realm = try! Realm()
let predicate = NSPredicate(format: "#matches.@count > 0")
menuArray = realm.objects(League).sorted("id").filter(predicate)