Sorting JSON when using Alamofire and SwiftyJSON - swift

Question

Morning all,
I've been following along the examples in the excellent iOS Apps With REST APIs book and as a result using Alamofire and SwiftyJSON. One thing I don't see mentioned in the book is how you would sort the incoming json objects into a specific order, eg. date. The code I've pasted below works fine for pulling in the json objects however as far as I can tell, they're automatically ordered by created_by. I'd like to sort by a different order, lets say my class was called Vegetable and had a name attribute so that I could sort by something like:
.sort { $0.name < $1.name }
I'll start with the Vegetable class in Vegetable.swift
class Vegetable: ResponseJSONObjectSerializable {
var id: Int?
var name : String?
var date: NSDate?
}
Inside my JSONSerializer file I have the following, I'm not sure I'd wish to change the order directly in here as I'd prefer some more flexibility with each call.
public func responseArray<T: ResponseJSONObjectSerializable>(completionHandler: Response<[T], NSError> -> Void) -> Self {
let serializer = ResponseSerializer<[T], NSError> { request, response, data, error in
guard error == nil else {
return .Failure(error!)
}
guard let responseData = data else {
let failureReason = "Array could not be serialized because input data was nil."
let error = Error.errorWithCode(.DataSerializationFailed, failureReason: failureReason)
return .Failure(error)
}
let JSONResponseSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let result = JSONResponseSerializer.serializeResponse(request, response, responseData, error)
switch result {
case .Success(let value):
let json = SwiftyJSON.JSON(value)
var objects: [T] = []
for (_, item) in json {
if let object = T(json: item) {
objects.append(object)
}
}
return .Success(objects)
case .Failure(let error):
return .Failure(error)
}
}
return response(responseSerializer: serializer, completionHandler: completionHandler)
}
Then, in my APIManager I have the following function
func getAllVegetables(completionHandler: (Result<[Vegetable], NSError>) -> Void) {
Alamofire.request(VegetableRouter.GetVegetables())
.responseArray { (response:Response<[Vegetable], NSError>) in
completionHandler(response.result)
}
}
Finally, populate my tableview I have:
func loadVegetables() {
self.isLoading = true
VegetablesAPIManager.sharedInstance.getAllVegetables() {
result in
self.isLoading = false
if self.refreshControl.refreshing {
self.refreshControl.endRefreshing()
}
guard result.error == nil else {
print(result.error)
// TODO: Display Error
return
}
if let fetchedVegetables = result.value {
self.vegetables = fetchedVegetables
for vegetable in fetchedVegetables {
// Nothing here at the moment
}
}
self.tableView.reloadData()
}
}
I appreciate any help I can get with this, Thanks!

Answer 1

Since you have a NSDate property, you can sort with the compare method of NSDate.
let sorted = result.value.sort { $0.date.compare($1.date) == .OrderedAscending }