Hello,
This is a beginner question but it has me stumped. I have a JSON file in the bundle that includes valid UUIDs generated from within Xcode in the format "D9BB6CD0-FBB9-49B9-9076-07D49E1707B2". I want to store these in a UUID variable within a struct.
struct model: Codable {
var id: UUID
var name: String
…
}I use a standard JSONDecoder() call to import the models.
let importedModels = Bundle.main.decode([model].self, from: "models.json")All of the other JSON data imports correctly. In fact it's been working so well it took me a while to notice that the UUIDs were not being populated. I just get a nil value for variable id.
I believe what's happening is that the decoder isn't initialising the UUID from the string properly and it's quietly failing (on UUID data only). But I don't understand why because in the definition for public struct UUID in Foundation it says,
/// Create a UUID from a string such as "E621E1F8-C36C-495A-93FC-0C247A3E6E5F".
///
/// Returns nil for invalid strings.
public init?(uuidString string: String)So if the string is valid is should work and I am using valid strings.
E621E1F8-C36C-495A-93FC-0C247A3E6E5F // Foundation documentation
D9BB6CD0-FBB9-49B9-9076-07D49E1707B2 // from models.jsonAny help greatly appreciated.
I use a standard JSONDecoder() call to import the models.
I cannot find any standard `JSONDecoder()` calls, and your code causes error on my Xcode:
Value of type 'Bundle' has no member 'decode'
I guess your `decode` may be wrong or your `models.json` may be wrong.
Please show your code and data.
As far as I tried with the following code and data, `JSONDecoder()` works fine with UUID:
struct Model: Codable {
var id: UUID
var name: String
//…
}
let modelsUrl = Bundle.main.url(forResource: "models", withExtension: "json")!
let modelsData = try! Data(contentsOf: modelsUrl)
let importedModels = try! JSONDecoder().decode([Model].self, from: modelsData)
print(importedModels)models.json:
[
{"id":"D9BB6CD0-FBB9-49B9-9076-07D49E1707B2","name":"name"}
]
