             case .price:
                 
                 
-                if let price = json["price"] as? Double {
+                if let price = json?["price"] as? Double {
                  
                     cell.textLabel?.text = "Price: \(price)"
                 


class ProductTableViewController: CHCacheTableViewController {

    enum Section: Int { case information }
    enum InformationRow: Int { case title, price, quantity }
    
    
    // MARK: Property
    
    let productIdentifier: String
    let sections: [Section] = [ .information ]
    let informationRows: [InformationRow] = [ .title, .price, .quantity ]
    
    
    // MARK: Init

        
        switch section {
        case .information: return informationRows.count
        case .description: return 1
        case .comment: return numberOfComments
        }
        
    }
