swift - Realm swift update List 写入每个运行时

Question

我的对象

   class RealmConversation: Object {

        @objc dynamic var id = ""
        var show = List<Show_id>()
        var show_ids: [String] {
            get {
                return show.map { $0.show_id }
            }
            set {
                show.removeAll()
                show.append(objectsIn: newValue.map {Show_id(value: [$0])})
            }
        }
        override class func ignoredProperties() -> [String] {
            return ["show_ids"]
        }
        override static func primaryKey() -> String? {
            return "id"
        }
    }

class Show_id:Object {
    @objc dynamic var show_id = ""
}

附加 View Controller

 newSpecimen.show_ids = ["id1", "id2", "id3"]
    realm.add(newSpecimen, update: true)   
    self.realmconversation = newSpecimen

结果是运行时总是增加 x2 show_ids如何更新字符串列表项

运行时1

运行时2

Answer 1

If you don’t want to save a field in your model to its Realm, override Object.ignoredProperties(). Realm won’t interfere with the regular operation of these properties; they’ll be backed by ivars, and you can freely override their setters and getters. Realm documentation

为此，在添加新对象之前，您应该检查 show_ids 是否包含您要添加的 id。