xcode Realm 中的自动递增 ID，Swift 3.0
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Auto increment ID in Realm, Swift 3.0
提问by Grumme
After a lot of troubles, i finally got my code converted to Swift 3.0.
经过一番折腾，我终于把我的代码转换成 Swift 3.0。
But it seems like my incrementID function isn't working anymore?
但似乎我的 incrementID 函数不再起作用了？
Any suggestions how i can fix this?
有什么建议我可以解决这个问题吗？
My incrementID and primaryKey function as they look right now.
我的 incrementID 和 primaryKey 函数就像它们现在的样子。
override static func primaryKey() -> String? {
return "id"
}
func incrementID() -> Int{
let realm = try! Realm()
let RetNext: NSArray = Array(realm.objects(Exercise.self).sorted(byProperty: "id")) as NSArray
let last = RetNext.lastObject
if RetNext.count > 0 {
let valor = (last as AnyObject).value(forKey: "id") as? Int
return valor! + 1
} else {
return 1
}
}
回答by Thomas Goyne
There's no need to use KVC here, or to create a sorted array just to get the max value. You can just do:
这里不需要使用 KVC，也不需要创建一个排序数组来获取最大值。你可以这样做：
func incrementID() -> Int {
let realm = try! Realm()
return (realm.objects(Exercise.self).max(ofProperty: "id") as Int? ?? 0) + 1
}
