Swift Codable is expected to decrypt the dictionary <String, Any>, but will instead find the string / data

Question

I worked with the Codable protocol

Here is my JSON file:

 {"Adress": [], "Object": [{"next-date": "2017-10-30T11:00:00Z", "text-sample": "Some text", "image-path": ["photo1.png", "photo2.png"], "email": " [e-mail] ", "id": "27"}, {"next-date": "2017-10-30T09:00:00Z", "text-sample": "Test Test", "image-path": ["image1.png"], "email": " [e-mail] ", "id": "28"} ] } 

I need to focus only on the Object array, and the "image-path" array can contain lines 0, 1, or 2.

So here is my implementation:

 struct Result: Codable { let Object: [MyObject] } struct MyObject: Codable { let date: String let text: String let image: [String] let email: String let id: String enum CodingKeys: String, CodingKey { case date = "next-date" case text = "text-sample" case image = "image-path" case email = "email" case id = "id" } init() { self.date = "" self.text = "" self.image = [] self.email = "" self.id = "" } } 

I call this from my service class after requesting and receiving JSON data in this way:

 if let data = response.data { let decoder = JSONDecoder() let result = try! decoder.decode(Result, from: data) dump(result.Object) } 

Everything works except [String] for the image property.

I tried different things, like this one:

 struct Result: Codable { let Object: [MyObject] } struct MyObject: Codable { struct Image: Codable { let imgName: String } let date: String let text: String let image: [Image] let email: String let id: String enum CodingKeys: String, CodingKey { case date = "next-date" case text = "text-sample" case image = "image-path" case email = "email" case id = "id" } init() { self.date = "" self.text = "" self.image = [] self.email = "" self.id = "" } } 

But it can not compile, or I get the error "Expected decoding ...".

How do I handle the nil / no data script?

Answer 1

I made a small change to your MyObject struct , i.e.,

1. All properties are marked as optionals

2. Removed init() (I don’t think there is an init() requirement here.)

3. Use Result.self instead of Result in the decoder.decode(...) method

 struct MyObject: Codable { let date: String? let text: String? let image: [String]? let email: String? let id: String? enum CodingKeys: String, CodingKey { case date = "next-date" case text = "text-sample" case image = "image-path" case email = "email" case id = "id" } } 

To check the above, I used the code below and it works fine.

  let jsonString = """ {"Adress": [], "Object": [{"next-date": "2017-10-30T11:00:00Z", "text-sample": "Some text", "image-path": ["photo1.png", "photo2.png"], "email": " [e-mail] ", "id": "27"}, {"next-date": "2017-10-30T09:00:00Z", "text-sample": "Test Test", "image-path": ["image1.png"], "email": " [e-mail] ", "id": "28"} ] } """ if let data = jsonString.data(using: .utf8) { let decoder = JSONDecoder() let result = try? decoder.decode(Result.self, from: data) //Use Result.self here print(result) } 

This is the result value that I get: