How to exclude properties from Swift 4's Codable

Question

Swift 4\'s new Encodable/Decodable protocols make JSON (de)serialization quite pleasant. However, I have not yet found a way to have fine-grained c

Answer 1

I have used protocol and its extension along with AssociatedObject to set and get image (or any property which needs to be excluded from Codable) property.

With this we dont have to implement our own Encoder and Decoder

Here is the code, keeping relevant code for simplicity:

protocol SCAttachmentModelProtocol{
    var image:UIImage? {get set}
    var anotherProperty:Int {get set}
}
extension SCAttachmentModelProtocol where Self: SCAttachmentUploadRequestModel{
    var image:UIImage? {
        set{
            //Use associated object property to set it
        }
        get{
            //Use associated object property to get it
        }
    }
}
class SCAttachmentUploadRequestModel : SCAttachmentModelProtocol, Codable{
    var anotherProperty:Int
}

Now, whenever we want to access the Image property we can use on the object confirming to protocol (SCAttachmentModelProtocol)