How to parse the Array of dictionaries using swift Unbox

Question

I am using unboxing (https://github.com/JohnSundell/Unbox.git) for Object mapping in my Project I have a problem with this, I am unable to parse the data when it is comes as a Array from service. For example if the data is in the below form

[
    {
        "name": "Spotify",
        "id":"101"
    },
    {
        "name": "Netflix",
        "id":"102"
    }
]

Getting an exception from the Unboxer, can we map Array objects through Object mapper? Please help me...

possible to get invalid json format from server.check your real data once with online json converter http://www.jsoneditoronline.org/ — Dharma, Jun 28 '17 at 11:53

score 0 · Answer 1 · answered Aug 31 '17 at 11:21

Unbox maps your JSON to structures or classes, therefore you have to have a struct/class that conforms to Unboxable protocol. For example:

struct Item: Unboxable {
    var id: String
    var name: String

    init(unboxer: Unboxer) throws {
        self.id = try unboxer.unbox(key: "id")
        self.name = try unboxer.unbox(key: "name")
    }
}

Then you can use it like so (provided URL serves your JSON example):

let url = URL(string: "https://api.myjson.com/bins/o8b4t")

let task = URLSession.shared.dataTask(with: url!) { data, _, _ in
    if let data = data {
        if let items: [Item] = try? unbox(data: data) {
            print(items.count, items.first?.name)
            // Output: 2 Optional("Spotify")
        }
    }
}

task.resume()

As for raw dictionaries or arrays, IMO there's no point of using Unbox for that, just use JSONSerialization.jsonObject(with:), like this:

let url = URL(string: "https://api.myjson.com/bins/o8b4t")

let task = URLSession.shared.dataTask(with: url!) { data, _, _ in
    if let data = data {
        if let parsed = (try? JSONSerialization.jsonObject(with: data)) as? [[String: String]] {
            print(parsed.count, parsed.first?["name"])
            // Output: 2 Optional("Spotify")
        }
    }
}

task.resume()

Note: In real world you'd prefer catching thrown exceptions (if any).

How to parse the Array of dictionaries using swift Unbox

1 Answers1