CODEWITHSUNDEEP
jsonswiftcodable
Dmitry Bakulin
Dmitry Bakulin

Reputation: 93

decode dictionary into array of codable structs

I have JSON as dictionary [String, Anyobject]:

{
  "AED": "United Arab Emirates Dirham",
  "AFN": "Afghan Afghani",
  "ALL": "Albanian Lek",
}

I need to decode it as array of codable structs Currency like:

struct Currency: Codable {
  var code: String
  var name: String
}

Currency(code: "AED", name: "United Arab Emirates Dirham")

Upvotes: 0

Views: 139

Answers (2)

93sauu
93sauu

Reputation: 4097

You need to create a container, for example named "Currencies" to use the single value container.

I share you the example playground:

let str = """
{
  "AED": "United Arab Emirates Dirham",
  "AFN": "Afghan Afghani",
  "ALL": "Albanian Lek",
}
"""

struct Currencies: Codable {
    var values: [Currency]

    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        let dict = try container.decode([String: String].self)

        values = dict.map({ (key, value) in
            return Currency(code: key, name: value)
        })
    }
}

struct Currency: Codable {
    var code: String
    var name: String

    enum CodingKeys: String, CodingKey {
        case code
        case name
    }
}

let currencies = try JSONDecoder().decode(Currencies.self, from: Data(str.utf8))
print(currencies.values)

Upvotes: 1

Omer Faruk Ozturk
Omer Faruk Ozturk

Reputation: 1852

You can decode the json as Dictionary and map to Array.

let currencies = try? JSONDecoder()
        .decode([String: String].self, from: data)
        .map({ Currency(code: $0.key, name: $0.value) })

Upvotes: 3

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