How would I unmarshal JSON to a class in swift?

Question

How do I unmarshal JSON onto a swift class? Here is Go code which illustrates what I am after.

I can't find any reference which shows how to do this in Swift. A reference I looked at ( among others ) was this tutorial.

But those example uses dictionaries. I want to use objects.

I saw attempts around this la: http://bit.ly/1t3W2Gi

but that post does not unmarshal to a class.

Answer 1

We've written an open source, protocol-based Swift framework called ObjectMapper that you might want to consider. From the README:

To support mapping, a class just needs to implement the MapperProtocol. ObjectMapper uses the "<=" operator to define how each member variable maps to and from JSON.

class User: MapperProtocol {

  var username: String?
  var age: Int?
  var weight: Double?
  var arr: [AnyObject]?
  var dict: [String : AnyObject] = [:]
  var friend: User?
  var birthday: NSDate?

  // MapperProtocol    
  class func map(mapper: Mapper, object: User) {
    object.username <= mapper["username"]
    object.age <= mapper["age"]
    object.weight <= mapper["weight"]
    object.arr <= mapper["arr"]
    object.dict <= mapper["dict"]
    object.friend <= mapper["friend"]
    object.birthday <= (mapper["birthday"], DateTransform<NSDate, Int>())
  }
}

While not as unobtrusive as, say, Gson for Java, it's fairly lightweight and explicit. Although it's in beta, we're happily using it internally.