Array of Codable structs possibly decoded from JSON data object

Question

I have this piece of code:

struct NoteRecord: Codable {

let id: String
let title: String
let detail: String?
let dueDate: String?

private enum CodingKeys: String, CodingKey {
    case id, title, detail, dueDate
}}

and parsing part:

do {
     let decoder = JSONDecoder()
     let note = try decoder.decode(NoteRecord.self, from: data)

      } catch let err {
          print("Error occured:", err)
      }

Is there any way to use this when REST API returns an array of objects to decode the data correctly as array of structs?

Just remove the let theNote = … line. note will be initialised if the data is valid — Ashley Mills
– Ashley Mills, Commented May 18, 2018 at 13:56

Kevinosaurio · Accepted Answer · 2018-05-18 13:58:34Z

2

Yes, just use this:

do {
     let decoder = JSONDecoder()
     let notes = try decoder.decode([NoteRecord].self, from: data)

      } catch let err {
          print("Error occured:", err)
      }

If you use [YourCodableStruct].self you are parsing the array. If you use YourCodableStruct.self you are parsing the struct.

answered May 18, 2018 at 13:58

Kevinosaurio

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1 Comment

Vanya Over a year ago

super easy, thanx

cekisakurek · Accepted Answer · 2018-05-18 13:58:31Z

1

You can implement another struct to hold the array.

struct NoteRecords: Codable {
    var list: [NoteRecord] // You should change the var name and coding keys
}

And parse it like

let note = try decoder.decode(NoteRecords.self, from: data)

I hope this helps.

answered May 18, 2018 at 13:58

cekisakurek

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