Representing an array of strings in Realm

Person.swift

/**
Although this example demonstrates how to store flat arrays of strings
on a Realm model, you can extend this pattern to store anything from
arrays of integers to native Swift enum's. Basically anything that you can
map to a representable type in Realm.
*/

class RealmString : Object {
    dynamic var stringValue = ""
}

class Person : Object {
    var nicknames: [String] {
        get {
            return _backingNickNames.map { $0.stringValue }
        }
        set {
            _backingNickNames = newValue.map { RealmString(value: [$0]) }
        }
    }
    dynamic var _backingNickNames = List<RealmString>()
}

I got it working by adding the transfer property to ignore and changing how it's filled:

class RealmString : Object {
    dynamic var stringValue = ""
}

class Person : Object {
    var nicknames: [String] {
        get {
            return _backingNickNames.map { $0.stringValue }
        }
        set {
            _backingNickNames.removeAll()
            _backingNickNames.append(contentsOf: newValue.map({RealmString(value: $0)}))
        }
    }
    dynamic var _backingNickNames = List<RealmString>()

    override static func ignoredProperties() -> [String] {
        return ["nicknames"]
    }
}