Swift: Convert JSON String to Array of Custom Object with ObjectMapper

Question

I am currently using the ObjectMapper for Swift (see: https://github.com/Hearst-DD/ObjectMapper/) to convert a String from a HTTP Request to an object of a custom class. The JSON I get from the request is a JSON Array, and I would like to convert this to an Array from type CustomObject.

I have tried it like this:

var object = Mapper<Array<CustomObject>>().map(string: json)

But then I get an error: Can not find member 'map'.

How should this be done?

Edit: this is my CustomObject Class, from now called ProductVariant:

public class ProductVariant: Mappable {

    /* Attributes */

    public var id = 0
//    var size : Size = nil
    public var SKU = ""
    public var stock = 0
    public var numberOfDefects = 0

    /* Constructors */

    public init?() {
        // Empty Constructor
    }

    required public init?(_ map: Map) {
        mapping(map)
    }

    /* Methods */

    public func mapping(map: Map) {
        id <- map["id"]
        SKU <- map["SKU"]
        stock <- map["stock"]
        numberOfDefects <- map["numberOfDefects"]
    }
}

I would guess you haven't implemented the " Mappable protocol as given in the ObjectMapper documentation. Can you post your CustomObject mapping if this is not the case? — wahwahwah
– wahwahwah, Commented Mar 24, 2015 at 16:38
Thanks for your comment! I have implemented the Mappable protocol, and I have updated my question. — bashoogzaad
– bashoogzaad, Commented Mar 24, 2015 at 16:46
If you are using ObjectMapper to map HTTP responses, you should consider using AlamofireObjectMapper. It is a simple extension to Alamofire which automatically converts your responses into swift objects using ObjectMapper. Full disclosure: I am the author of both ObjectMapper and AlamofireObjectMapper — tristan_him
– tristan_him, Commented May 16, 2015 at 16:37

bashoogzaad · Accepted Answer · 2015-03-25 10:37:12Z

35

I have found a solution, which seems to be working:

var list: Array<ProductVariant> = Mapper<ProductVariant>().mapArray(string: json)

When I loop through the array, it gives me the correct attributes for the CustomObject.

My mistake was that I tried to put the Array in the type of the Mapper, as shown in my question.

answered Mar 25, 2015 at 10:37

bashoogzaad

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3 Comments

Thein Over a year ago

Thanks, I looking for this. May I know the source you found ? I cannot find in their github page.

bashoogzaad Over a year ago

@Megamind I just figured it out with trial on error, cant remember that I have found it anywhere online

RefuX Over a year ago

Just a little note that Mapper has multiple mapArray functions. You want to hit the mapArray(JSONString: String) one not the mapArray(JSON: AnyObject?) one.

Bogdan Ustyak · Accepted Answer · 2017-02-28 11:48:36Z

3

Another option is

let products = Mapper<ProductVariant>().mapArray(JSONString: json)

answered Feb 28, 2017 at 11:48

Bogdan Ustyak

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Comments

Shivam Bansal · Accepted Answer · 2021-11-25 08:58:53Z

0

I think you need to install the object mapper pod and import ObjectMapper in your file

answered Nov 25, 2021 at 8:58

Shivam Bansal

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