使用领域迅速从过滤器的查询获取相关对象的值

Question

所以林相当新的境界，我感觉我的问题很简单，但我不能找到它的答案。

基本上我想查询及的境界与特定playerName相关联的所有TeamID（即TeamID不是主键），但林无法找到解决方案。我不断收到一个Value of type 'Results<playerInfoTable>' has no member 'playerName'错误。

下面是我的领域类： `类playerInfoTable：对象{

@objc dynamic var playerID: Int = 0
@objc dynamic var playerName: String = ""
@objc dynamic var jerseyNum: Int = 0
@objc dynamic var TeamID: String = ""
@objc dynamic var goalCount: Int = 0
@objc dynamic var shotCount: Int = 0

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

}`

和代码我使用的查询境界：

let mainPlayerFilter = NSPredicate(format: "teamID == %@", "1")
let mainPlayerStrings = realm.objects(playerInfoTable.self).filter(mainPlayerFilter)
let mainPlayerTeamName = mainPlayerStrings.playerName

解！

let mainPlayerFilter = NSPredicate(format: "TeamID == %@", String(homeTeam!))
let mainPlayerStrings = realm.objects(playerInfoTable.self).filter(mainPlayerFilter)
let mainPlayerTeamName = mainPlayerStrings.value(forKeyPath: "playerName") as! [String]

Answer 1

我想，当你声明的mainPlayerTeamName常数你的错误。尝试以下方法：

let mainPlayerTeamName = mainPlayerStrings.first?.playerName

而且我注意到，在您的playerInfoTable类声明“teamID”为“TeamID”，而在你的谓词你把它称为“teamID”。决定你想要哪一个，因为NSPredicate区分默认敏感。