     override func modelJson() -> Any
     {
         let json:[String:Any] = [
-            Property.froobSpace.rawValue:froobSpace
+            Property.froobSpace.rawValue:froobSpace,
+            Property.plusSpace.rawValue:plusSpace
         ]
         
         return json

    enum Property:String
    {
        case froobSpace = "froobSpace"
    }
    
    let froobSpace:Int
    private let kNoSpace:Int = 0
    
    init(froobSpace:Int)
    {
        self.froobSpace = froobSpace
        
        super.init()
    }

            self.froobSpace = kNoSpace
        }
        
        if let plusSpace:Int = snapshotDict?[Property.plusSpace.rawValue] as? Int
        {
            self.plusSpace = plusSpace
        }
        else
        {
            self.plusSpace = kNoSpace
        }
        
        super.init()
    }
    
