Using enums in Realm

Realm+Enum2.swift

final class SortRule: Object {
    @objc dynamic var keyRaw: String  = ""
    @objc dynamic var typeRaw: String = ""

    var key: SortKey {
        if let key = SortKey.fromRaw(keyRaw) {
            return key
        }

        return .name
    }

    var type: SortType {
        if let type = SortType.fromRaw(typeRaw) {
            return type
        }

        return .same
    }

    convenience init(key: SortKey, type: SortType) {
        self.init(value:
            [
                "keyRaw": key.rawValue,
                "typeRaw": type.rawValue
            ]
        )
    }
}

extension RawRepresentable {
    static func fromRaw(_ value: Self.RawValue) -> Self? {
        return Self(rawValue: value)
    }
}