iOS - Decode nested JSON with dynamic key

Question

I am trying to decode a JSON that one of the keys changes:

[
{
    "id": "device:us-east-1",
    "serial": "eng031",
    "account": "9340370e",
    "name": "moti123",
    "tags": {
        "group": [
            "office"
        ]
    },
    "isAttached": true,
    "isShared": false
},
{
    "id": "lambda:device:us-east-1",
    "serial": "106",
    "account": "9340370e",
    "name": "roei106 ",
    "tags": {
        "comment": [
            "Iron Maiden "
        ]
    },
    "isAttached": true,
    "isShared": false
}
]

As you can see the tags has a nested JSON with different keys in these example: group and comment.

What I did before is pretty simple. I had these structs:

public struct Device: Decodable {
  public init() {}

  public var id: String = ""
  public var serial: String = ""
  public var account: String = ""
  public var name: String = ""
  public var isAttached: Bool?
  public var isShared: Bool?
  public var tags: Tags?
 }

public struct Tags: Decodable {
  public init() {}

  public var comment: [String] = [""]
 }

And I used to parse them as follow:

   func getDevices(data: Data) -> [Device] {
    var devices = [Device]()

    do {
        let parsedModel = try JSONDecoder().decode([Device].self, from: data)
        devices = parsedModel
        print(parsedModel)
    } catch let error{
        print(error)
    }
    return devices
}

It all have worked fine until the key in the tags changed. Is there any way to know what is the key and change it inside the tag struct?

Is it important for you to keep the difference between "comment" and "group"? Or you just want the array value? — Larme, Jan 20 '19 at 11:38

score 0 · Accepted Answer · answered Jan 20 '19 at 09:56

0

As you can see Tags contains a Dictionary, that have String as key and Array of string as value.

So you can modify

public struct Tags: Decodable {
  public init() {}

  public var contents: [String:[String]]?
 }

answered Jan 20 '19 at 09:56

Lal Krishna

15,485
6
64
84

Did it like so: [String:[String]] = ["":[""]] – ironRoei Jan 20 '19 at 12:55
1

Or you could use it as: `contents = [String:[String]]()` – Lal Krishna Jan 21 '19 at 05:48

score 0 · Answer 2 · edited Jan 20 '19 at 14:12

0

I recomend use this struct

typealias Scenarios = [Scenario]

struct YourJsonName: Codable {
    let id, serial, account, name: String
    let tags: Tags
    let isAttached, isShared: Bool
}

struct Tags: Codable {
    let group, comment: [String]?
}

If you need init:

 public struct Tags: Decodable {
    public init() {}
    public var  comment: [String]? = nil
    public var  group: [String]? = nil
 }

edited Jan 20 '19 at 14:12

E.Coms

11,065
2
23
35

answered Jan 20 '19 at 11:49

teodik abrami

124
6

I need the public init() {} because this is a cocoapod – ironRoei Jan 20 '19 at 12:24
any more ideas ? – ironRoei Jan 20 '19 at 12:33
check updated answer. – E.Coms Jan 20 '19 at 14:12

iOS - Decode nested JSON with dynamic key

2 Answers2