Hi, I keep trying to use transformable to store an array of strings with SwiftData, and I can see that it is activating the transformer, but it keeps saying that I am still using NSArray instead of NSData.
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "category"; desired type = NSData; given type = Swift.__SwiftDeferredNSArray; value = ( yo, gurt ).' terminating due to uncaught exception of type NSException CoreSimulator 1010.10 - Device: iPhone 16 18.0 (6879535B-3174-4025-AD37-ED06E60291AD) - Runtime: iOS 18.0 (22A3351) - DeviceType: iPhone 16 Message from debugger: killed
@Model
class MyModel: Identifiable, Equatable {
@Attribute(.transformable(by: StringArrayTransformer.self)) var category: [String]?
@Attribute(.transformable(by: StringArrayTransformer.self)) var amenities: [String]?
var image: String?
var parentChunck: MyModelDataChunk_V1?
init(category: [String]?, amenities: [String]?) {
self.category = category
self.amenities = amenities
}
}
class StringArrayTransformer: ValueTransformer {
override func transformedValue(_ value: Any?) -> Any? {
print(value)
guard let array = value as? [String] else { return nil }
let data = try? JSONSerialization.data(withJSONObject: array, options: [])
print(data)
return data
}
override func reverseTransformedValue(_ value: Any?) -> Any? {
guard let data = value as? Data else { return nil }
let string = (try? JSONSerialization.jsonObject(with: data, options: [])) as? [String]
print(string)
return string
}
override class func transformedValueClass() -> AnyClass {
return NSData.self
}
override class func allowsReverseTransformation() -> Bool {
return true
}
static func register() {
print("regitsering")
ValueTransformer.setValueTransformer(StringArrayTransformer(), forName: .stringArrayTransformerName)
}
}
extension NSValueTransformerName {
static let stringArrayTransformerName = NSValueTransformerName("StringArrayTransformer")
}
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