Creating an NSCache for the first time with CloudK

Question

I have a project I'm close to completing. My last problem arises when I've downloaded CloudKit records to an array to be displayed in a tableview. Here is my code for the query portion of the controller.

           for result in results!
            {
                let tablerestaurant = Restaurant()
                if let name = result.value(forKey: "Name") as! String? {
                    tablerestaurant.name = name
                }
                // Do same for image
                if let imageAsset = result.object(forKey: "Picture") as! CKAsset? {   
                    if let data = try? Data(contentsOf: imageAsset.fileURL) {
                        tablerestaurant.image =  UIImage(data: data)
                    }
                }
                self.tablerestaurantarray.append(tablerestaurant) // tablerestaurant is an array holding string and image instances of class Restaurant
                self.restaurantArray.append(result) // restaurantArray holds CKRecords to be segued to the next controller 
            OperationQueue.main.addOperation( { () -> Void in
                self.tableView.reloadData()
                self.activity.isHidden = true
            })}

and here is my cellForRowAtIndexPath Tablecell function, with the cache portion commented along with the global arrays here

 var tablerestaurantarray: [Restaurant] = []
 let cache = NSCache<NSString, Restaurant>()

-

override func tableView(_ tableView: UITableView, cellForRowAt     indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier:     "restaurantcell") as? RestaurantTableCell


    /////////this is the cache portion//////////////
    var oneRestaurant: Restaurant = tablerestaurantarray[indexPath.row]

    if let cachedVersion = cache.Restaurant(forKey: "image")
        {
            oneRestaurant = cachedVersion
    }
    else
    {
        oneRestaurant = Restaurant()
        cache.setObject(oneRestaurant, forKey: "image")
    }
    //////////////////////////


    let restaurant: Restaurant = tablerestaurantarray[indexPath.row]
    cell?.name?.text = oneRestaurant.name

   // cell?.picture?.image = oneRestaurant.image
    return cell!

I've attempted to copy this simply cache procedure from here https://www.hackingwithswift.com/example-code/system/how-to-cache-data-using-nscache and transcribe it towards my own use. However, the debugger states that

NSCache<NSString, Restaurant> has no member Restaurant

which it does. So I'm lost as to my problem. Would you have an idea?

Update 2

 var tablerestaurantarray: [Restaurant] = []
 let cache = NSCache<NSString , Restaurant>()


var oneRestaurant: Restaurant = tablerestaurantarray[indexPath.row]


    if let cachedVersion = cache.object(forKey: "image") { } //error is called here
    {
        oneRestaurant = cachedVersion
    }
    else
    {
        oneRestaurant = Restaurant()
        cache.setObject(oneRestaurant, forKey: "image")
    }