How to map dictionary with dynamic keys with ObjectMapper?

Question

I'm new to ObjectMapper. I have response from the server:

{
      "123123": 10,
      "435555": 2,
      "435333": 8,
      "567567": 4
}

Keys (dynamic) are going to be IDs. Values are going to be COUNT. How can I map it with ObjectMapper?

My code isn't working because dynamic keys:

extension Item: Mappable {

    private static let kId = "id"
    private static let kCount = "count"

    public init?(map: Map) {
        self.init()
    }

    mutating public func mapping(map: Map) {

        id <- map[Item.kId]
        count <- map[Item.kCount]
    }
}

I feel, ObjectMapper won't be able to help you as it will be dynamic Ids. Why can't you create custom class/struct/simple dictionary for this case. — Pavan
– Pavan, Commented Mar 13, 2019 at 12:03

Omid Golparvar · Accepted Answer · 2019-03-13 12:16:19Z

Your response is an object and you can access it via map.JSON, and its type is [String: Any]. Then you can use that like a normal Dictionary.

Here I create a class named Model that has array of items (of type Item) and in func mapping(:Map) I mapped map.JSON elements to Item.

class Model: Mappable {
    typealias Item = (id: String, count: Int)
    var items: [Item] = []

    required init?(map: Map) {

    }

    func mapping(map: Map) {
        let rawDictionary = map.JSON
        let items = rawDictionary.compactMap { (key, value) -> Item? in
            guard let intValue = value as? Int else { return nil }
            return (key, intValue)
        }
        self.items = items
    }
}

let jsonString = """
{
    "123123": 10,
    "435555": 2,
    "435333": 8,
    "567567": 4
}
"""

let model = Model(JSONString: jsonString)
print(model?.items[0])  //Optional((id: "123123", count: 10))

Shehata Gamal · Accepted Answer · 2019-03-13 12:00:52Z

2

You can try

 do{

    let res = try JSONDecoder().decode([String:Int].self, from: data)

}
catch {

    print(error)
}

answered Mar 13, 2019 at 12:00

Shehata Gamal

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