Getting "Must have a uuid if no _objectID" exception when inserting object into dictionary - swift

Question

I'm writing a unit-test to a class that uses PHAsset type. I mocked it as below:
class PHAssetMock: PHAsset {
let date: Date
let uuid: UUID
init(dateStr: String) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy HH:mm"
self.date = dateFormatter.date(from: dateStr)!
self.uuid = UUID()
}
override var creationDate: Date? {
return date
}
override var hash: Int {
let hash = Int(self.date.timeIntervalSinceNow)
return hash
}
static func ==(lhs: PHAsseMock, rhs: PHAsseMock) -> Bool {
return lhs.date.timeIntervalSinceNow == rhs.date.timeIntervalSinceNow
}
}
When a function that uses mocked objects tries to insert it in a dictionary I'm getting an exception:
func foo(assets: [PHAsset]) {
var label: [T: String]()
for asset in assets {
label[asset] = "undefined" // Exception: "NSInternalInconsistencyException", "Must have a uuid if no _objectID"
}
}
When debugging, the override hash var is being called.

Answer 1

I had the same issue with the PHAsset when unit testing Photos framework. Overriding isEqual function helped to get rid of the exception.
class Mock : PHAsset {
let _localIdentifier: String = UUID().uuidString
let _hash: Int = UUID().hashValue
override var localIdentifier: String {
return _localIdentifier
}
override var hash: Int {
return _hash
}
override func isEqual(_ object: Any?) -> Bool {
guard let object = object as? Mock else {
return false
}
return self.localIdentifier == object.localIdentifier
}
}