Core Data - Warns of unarchival of a type that is included in the permitted classes for the associated value transformer

Question

thafner OP

Created Jan ’22

Replies 1

Boosts 1

Views 1.4k

Participants 1

When I run my app, Core Data gives this message

 [general] *** -[NSKeyedUnarchiver validateAllowedClass:forKey:] allowed unarchiving safe plist type ''NSString' (0x1dcf177d0) [/System/Library/Frameworks/Foundation.framework]' for key 'NS.objects', even though it was not explicitly included in the client allowed classes set: '{(
 
    "'NSArray' (0x1dcf0cac8) [/System/Library/Frameworks/CoreFoundation.framework]"
 
)}'. This will be disallowed in the future.

despite the fact that the custom value transformer that I have specifically allows StoredRoutes (custom type conforming to NSSecureCoding), NSArray and NSString. The StoredRoutes type has an array of an enumeration Route which I use to keep track of the routes that are served by a station.

What am I missing here?

Value transformer code for reference:

 import Foundation
 
final class StoredRoutesValueTransformer: NSSecureUnarchiveFromDataTransformer {
  
    static var name = NSValueTransformerName(rawValue: "StoredRoutesValueTransformer")
 
    override class func allowsReverseTransformation() -> Bool {
        return true
    }
 
    override class func transformedValueClass() -> AnyClass {
        return StoredRoutes.self
    }
 
    override class var allowedTopLevelClasses: [AnyClass] {
        return [StoredRoutes.self, NSArray.self, NSString.self]
    }
 
    override func transformedValue(_ value: Any?) -> Any? {
        guard let data = value as? Data else {
            fatalError("Wrong data type: value must be of type Data. The type the value recieved was \(type(of: value)).")
        }
        return super.transformedValue(data)
    }
 
    override func reverseTransformedValue(_ value: Any?) -> Any? {
        guard let storedRoutes = value as? StoredRoutes else {
            fatalError("Wrong data type: value must be of type StoredRoutes. The type of the value recieved was \(type(of: value))")
        }
        return super.reverseTransformedValue(storedRoutes)
    }
 
    public static func register() {
        let transformer = StoredRoutesValueTransformer()
 
        ValueTransformer.setValueTransformer(transformer, forName: name)
    }
}

Answered by thafner in 741187022

Update: This error occurred since the custom class StoredRoutes was trying to decode an NSArray, use the methods for decoding an array instead.

Older code:

 public init?(coder: NSCoder) {
        if let nsArray = coder.decodeObject(of: NSArray.self, forKey: "routes") {
            self.routes = []
            for id in nsArray {
                self.routes.append(Route(rawValue: id as! String)!)
            }
        } else {
            return nil
        }
    }

New code that fixes this issue:

 public init?(coder: NSCoder) {
        if let nsArray = coder.decodeArrayOfObjects(ofClass: NSString.self, forKey: "routes") {
            self.routes = []
            for id in nsArray {
                self.routes.append(Route(rawValue: id as String)!)
            }
        } else {
            return nil
        }
    }

Boost

Answer 1

thafner OP

Jan ’23

Accepted Answer

Update: This error occurred since the custom class StoredRoutes was trying to decode an NSArray, use the methods for decoding an array instead.

Older code:

 public init?(coder: NSCoder) {
        if let nsArray = coder.decodeObject(of: NSArray.self, forKey: "routes") {
            self.routes = []
            for id in nsArray {
                self.routes.append(Route(rawValue: id as! String)!)
            }
        } else {
            return nil
        }
    }

New code that fixes this issue:

 public init?(coder: NSCoder) {
        if let nsArray = coder.decodeArrayOfObjects(ofClass: NSString.self, forKey: "routes") {
            self.routes = []
            for id in nsArray {
                self.routes.append(Route(rawValue: id as String)!)
            }
        } else {
            return nil
        }
    }

1

	[general] *** -[NSKeyedUnarchiver validateAllowedClass:forKey:] allowed unarchiving safe plist type ''NSString' (0x1dcf177d0) [/System/Library/Frameworks/Foundation.framework]' for key 'NS.objects', even though it was not explicitly included in the client allowed classes set: '{(

	"'NSArray' (0x1dcf0cac8) [/System/Library/Frameworks/CoreFoundation.framework]"

	)}'. This will be disallowed in the future.

	import Foundation

	final class StoredRoutesValueTransformer: NSSecureUnarchiveFromDataTransformer {

	static var name = NSValueTransformerName(rawValue: "StoredRoutesValueTransformer")

	override class func allowsReverseTransformation() -> Bool {
	return true
	}

	override class func transformedValueClass() -> AnyClass {
	return StoredRoutes.self
	}

	override class var allowedTopLevelClasses: [AnyClass] {
	return [StoredRoutes.self, NSArray.self, NSString.self]
	}

	override func transformedValue(_ value: Any?) -> Any? {
	guard let data = value as? Data else {
	fatalError("Wrong data type: value must be of type Data. The type the value recieved was \(type(of: value)).")
	}
	return super.transformedValue(data)
	}

	override func reverseTransformedValue(_ value: Any?) -> Any? {
	guard let storedRoutes = value as? StoredRoutes else {
	fatalError("Wrong data type: value must be of type StoredRoutes. The type of the value recieved was \(type(of: value))")
	}
	return super.reverseTransformedValue(storedRoutes)
	}

	public static func register() {
	let transformer = StoredRoutesValueTransformer()

	ValueTransformer.setValueTransformer(transformer, forName: name)
	}
	}

	public init?(coder: NSCoder) {
	if let nsArray = coder.decodeObject(of: NSArray.self, forKey: "routes") {
	self.routes = []
	for id in nsArray {
	self.routes.append(Route(rawValue: id as! String)!)
	}
	} else {
	return nil
	}
	}

	public init?(coder: NSCoder) {
	if let nsArray = coder.decodeArrayOfObjects(ofClass: NSString.self, forKey: "routes") {
	self.routes = []
	for id in nsArray {
	self.routes.append(Route(rawValue: id as String)!)
	}
	} else {
	return nil
	}
	}