Tuple Transformations
To map enums use the JMTransformerProtocol. Let's look at a dictionary for a business object, and see how we can map the coordinates as a tuple.
Response Dictionary
{
'business_uuid' : 9223123456754775807,
'business_name' : 'UsTwo Restaurant',
'business_longitude' : 40.7053319,
'business_latitude' : -74.0129945,
}
For the purposes of the example, let's create a mapper that returns a tuple. First, create an enum to represent the business type for our custom Business Object:
JSONModelKitTupleCoordinateExampleTransformer Implementation
let longitudeKey = "business_longitude"
let latitudeKey = "business_latitude"
public class JSONModelKitTupleCoordinateExampleTransformer : JMTransformerProtocol {
public func transformValues(inputValues : Dictionary<String, Any>?) -> Any? {
if let coordinateDictionary = inputValues as? Dictionary<String, Double> {
if let unwrappedLongitude = coordinateDictionary[longitudeKey] as? Double {
if let unwrappedLatitude = coordinateDictionary[latitudeKey] as? Double {
return (longitude : unwrappedLongitude, latitude : unwrappedLatitude)
}
}
}
return nil
}
}
Now that we have created a transformer, let's create mapping for our business Object:
| JSON: /Model/Mappings/Business.json | PLIST: /Mappings/Business.plist |
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After the creation of the mapping, perform a build (⌘-B). The changes should be reflected accordingly in the internal _Business.swift class.
import Foundation
import JSONModelKit
class _Business {
var uuid : Double?
var name : String?
var coordinates : (longitude : Double, latitude : Double)?
required init() {...}
convenience init?(_ dictionary: Dictionary<String, Any>) {...}
}
After calling the fail-able initializer - or udpateWithDictionary method with a dictioanry representation - JSONModelKit will use the custom transformer to map the tuple accordingly.
Note: The the keys defined in the property mapping correspond to the keys in the dictionary of values passed to the public func transformValues(inputValues : Dictionary<String, Any>?) -> Any? method defined by the protocol.