Convert String type JSON to Integer with ObjectMapper

Question

I have my model class

class CPOption : Object, Mappable
{

dynamic var optionId : Int64 = 0

override static func primaryKey() -> String? {
    return "optionId"
}

required convenience init?(map: Map) {
    self.init()
}

func mapping(map: Map) {

    optionId     <- map["id"] //**Here i need to transform string to Int64**
}
}

Where my input JSON contain optionId as String.

"options": [
            {
                "id": "5121",
            },
        ]

I need to convert this incoming string type to Int64 in Objectmapper Map function.

Answer 1

You can create custom object Transform class.

class JSONStringToIntTransform: TransformType {

    typealias Object = Int64
    typealias JSON = String

    init() {}
    func transformFromJSON(_ value: Any?) -> Int64? {
        if let strValue = value as? String {
            return Int64(strValue)
        }
        return value as? Int64 ?? nil
    }

    func transformToJSON(_ value: Int64?) -> String? {
        if let intValue = value {
            return "\(intValue)"
        }
        return nil
    }
}

And use this custom class in your mapping function for the transformation

optionId <- (map["id"], JSONStringToIntTransform())