Generic list parse

[sagits]

Hi, im trying to parse a generic list, i think that there is no support for it for now, but is there any way i can use setValue forUndefinedKey function to pass a class type and be able to parse the list? Maybe is there another way? Thanks in advance.

What i have now:

class JsonMessage : EVObject {
  var _meta : MetaModel

  override
  init() {
      _meta = MetaModel()
  }
} 

class JsonMessageList<T> : JsonMessage {
  var records = [T]()

  override
  init() {

  }

}

   Alamofire.request(.GET, URL, headers: headers)
            .responseObject { (response: JsonMessageList<ProductModel>?, error: NSError?) in
               if (error == nil && response != nil) {
                   for product in response!.records {
                       println("id: " + product.name!);
                   }
                }
                else {
                    println("Error on request");
                }
            }

Im an Android Developer, and i have created a lib that does this on android. I pass a Model.class (Class) to a ListHelperModel and use this list as a type for gson (a google library that parse json to objects) to parse the list.

Take a look if you want:

ListHelperModel

Check getList() method

Unfortunelly im very new to swift/ios, so i just dont know how and if i can reproduce this.

[evermeer]

indeed you have to use the setValue forUndefinedKey. here is a unit test that will show you how to use generics: https://github.com/evermeer/EVReflection/blob/68edace301602dd43181075c604a1f987185be3f/EVReflection/EVReflectionTests/WorkaroundSwiftGenericsTests.swift#L16-46 And to make that work, you have to add the EVGenericsKVC protocol after your class definition

[sagits]

Thank you, it worked, but the [T] was not being detected as a [ProductModel]. A have been able to cast a single T to a Object, but not [T] to [Objects], example:

           //var list = response!.records as! [ProductModel]! this wont work, as ProductModel is not a U

           var list = response!.records as [U]!

            for product in list {
                var products : [ProductModel] = [ProductModel]();

                var p = product as! ProductModel
                products.append(p)
                println(product is ProductModel)
                println("id: " + p.name!);
            }

Is there a way to cast the entire list (sorry for asking, but i really cant found anything about it)? By the way, i'm trying to archieve this pattern:

ViewController:

    var c : CallListListener<ProductModel> = CallListListener<ProductModel>()
    GenericDao<ProductModel>().getAll(c);

GenericDao

  Alamofire.request(method, serverUrl + URL, headers: getHeaders())
      .responseObject {
          (response: JsonMessageList<U>?, error: NSError?) in

Thanks in advance.

[evermeer]

Ah, this could be 2 things.

1. a generic array is of type Any and not AnyObject or NSObject. Then you should implement something like this: https://github.com/evermeer/EVReflection/blob/bb630dfb7759f3269ad872ba9e01b133d7b8e67c/EVReflection/EVReflectionTests/WorkaroundsTests.swift#L83-97
2. in the setValue forUndefinedKey you will receive an array of dictionaries. So instead of assigning and casting it directly, you have to map it to your objects like this: array = (value as! NSArray).map({T(dictionary:$0)})

At the moment I can't create a sample for you. I will have a look at it tomorrow.

[evermeer]

I was wrong. It should just work. I created a new unit test that shows this. Here it is: https://github.com/evermeer/EVReflection/blob/c0de1d56f2589df7c0650a33ddb06b539a116d2b/EVReflection/EVReflectionTests/WorkaroundSwiftGenericsTests.swift#L25-35

In your json, do you have a root object with the property records which will contain an array of your product model records? So something like this: {"records":[{"property":"value"},{"property":"value2"}]} Or is the root of the json already an array? like this: [{"property":"value"},{"property":"value2"}] If so, then you need to use .responseArray instead of .responseObject

[sagits]

Thank you for your time man, now its working, My json was an object with an array inside. But i'm ashamed too say that my error was not typing records:

 var records = [T]()

Should be:

    var records : [T] = [T]()

My mistake, sorry. And just for helping others: Appcode will not convert your T objects to the actual model type (it will not autocomplete, but if you type list[0].someproperty it will work).

[evermeer]

Great that I could be of help. And now there are more unit tests that show how it should work. And we know that it does work. So no problem!