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Start your free trialAlex Chapple
3,196 PointsI keep getting invalid Resource Fatal error?
I've done the part up to causing a fatal error for the vending app twice now ( had the same problem so did the course from scratch), but I still get a fatal error! Is there anything I've done wrong here?
import Foundation
enum VendingSelection: String {
case soda
case dietSoda
case chips
case cookie
case sandwich
case wrap
case candyBar
case popTart
case water
case fruitJuice
case sportsDrink
case gum
}
protocol VendingItem {
var price: Double { get }
var quantity: Int { get set }
}
protocol VendingMachine {
var selection: [VendingSelection] { get }
var inventory: [VendingSelection: VendingItem] { get set }
var amountDeposited: Double { get set }
init(inventory: [VendingSelection: VendingItem])
func vend(_ quantity: Int, _ selection: VendingSelection) throws
func deposit(_ amount: Double)
}
struct Item: VendingItem {
let price: Double
var quantity: Int
}
enum InventoryError: Error {
case invalidResource
case conversionFailure
case invalidSelection
}
class PlistConvertor {
static func dictionary(fromFile name: String, ofType type: String) throws -> [String: AnyObject] {
guard let path = Bundle.main.path(forResource: name, ofType: type) else {
throw InventoryError.invalidResource
}
guard let dictionary = NSDictionary(contentsOfFile: path) as? [String: AnyObject] else {
throw InventoryError.conversionFailure
}
return dictionary
}
}
class InventoryUnarchiver {
static func vendingInventory(fromDictionary dictionary: [String: AnyObject]) throws -> [VendingSelection: VendingItem] {
var inventory: [VendingSelection: VendingItem] = [:]
for (key, value) in dictionary {
if let itemDictionary = value as? [String: Any], let price = itemDictionary["price"] as? Double,
let quantity = itemDictionary["quantity"] as? Int {
let item = Item(price: price, quantity: quantity)
guard let selection = VendingSelection(rawValue: key) else {
throw InventoryError.invalidSelection
}
inventory.updateValue(item, forKey: selection)
}
}
return inventory
}
}
class FoodVendingMachine: VendingMachine {
let selection: [VendingSelection] = [.soda, .dietSoda, .chips, .cookie, .wrap, .sandwich, .candyBar, .popTart, .water, .fruitJuice, .sportsDrink, .gum]
var inventory: [VendingSelection: VendingItem]
var amountDeposited: Double = 10.0
required init(inventory: [VendingSelection : VendingItem]) {
self.inventory = inventory
}
func vend(_ quantity: Int, _ selection: VendingSelection) throws {}
func deposit(_ amount: Double) {}
}
Caleb Kleveter
Treehouse Moderator 37,862 PointsCaleb Kleveter
Treehouse Moderator 37,862 PointsDouble check the path to the plist that your are storing the inventory in and the location of the plist.