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.

score 12 · Accepted Answer · answered Nov 23 '17 at 07:31

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())

Thank you for this. Helped save me time. – NullHypothesis Aug 05 '18 at 15:51 — NullHypothesis, Aug 05 '18 at 15:51

score 2 · Answer 2 · answered Nov 23 '17 at 07:31

2

there is trick to use that

func mapping(map: Map) {
    let optionIdTemp: String?
    optionIdTemp <- map["id"]
    optionId = (optionIdTemp as? NSString)?.intValue
}

answered Nov 23 '17 at 07:31

Prabhjot Singh Gogana

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This works too, but it is not useful when you need to transform a big set of variables – Johana Lopez 1327 Apr 02 '19 at 21:01

Convert String type JSON to Integer with ObjectMapper

2 Answers2