Could it be because ModelListResponse is Generalized while APIResponse is not?
-Kenny
> On Sep 28, 2016, at 5:43 PM, Eric Conner via swift-users
> <swift-users@swift.org> wrote:
>
> Hello all!
>
> I hope it's not frowned upon to repost a question here from Stack Overflow,
> but I have not found help there. In any case, the email gets some nice
> formatting out of it :-D.
>
> I am trying to create a subclass with a generic type that can be passed into
> a completion block, but am getting the following error:
>
> Cannot convert value of type '(ModelListResponse) -> ()' to expected argument
> type '(APIResponse) -> ()'
> Parent class:
>
> import ObjectMapper
>
>
>
> class APIResponse: Mappable {
>
>
> var status: String!
>
>
> var message: String?
>
>
> required init
> ?(map: Map) {}
>
>
> func mapping
> (map: Map) {
>
> status
> <- map["status"]
>
> message
> <- map["message"]
>
>
> }
> }
> Subclass:
>
> import ObjectMapper
>
>
>
> class ModelListResponse<T: Mappable>: APIResponse {
>
>
> var data: ModelList<T>?
>
>
> required init
> ?(map: Map) {
>
>
> super.init(map: map)
>
>
> }
>
>
>
> override func mapping(map: Map) {
>
>
> super.mapping(map: map)
>
> data
> <- map["data"]
>
>
> }
> }
> Then I have a function definition:
>
> func _GET(path: String, parameters: Parameters, completion:@escaping
> (APIResponse) -> ())
> And I'm trying to call it like so:
>
> // error is on this line
> self._GET(path: "/rest/posts", parameters: parameters) { (response:
> ModelListResponse<Post>) in
>
>
> // ...
> }
> But here I get the error about how ModelListResponse cannot be converted.
> Isn't a ModelListResponse an APIResponse? I don't understand why this does
> not work.
>
> I managed to get around the issue by using a generic. Though I'm not sure why
> this works and the above code does not. Here is my working declaration:
>
> func _GET<T: Mappable>(path: String, parameters: Parameters,
> completion:@escaping (T) -> ()) { }
> Thanks!
>
> _______________________________________________
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
