Alamofire Promise make generic request method - swift

Question

I am trying to implement a generic method which is used to get data from API call.
Here is My code.
class Http {
class func asyncGetRequest()->Promise<List> {
return Promise {
resolve in
Alamofire.request(GET_PROFFESSIONAL).responseData().done { response in
guard let blog = try? JSONDecoder().decode(List.self, from: response.data) else {
let error = MyError(message: "Error: Couldn't decode")
resolve.reject(error)
return
}
resolve.fulfill(blog as List)
}.ensure {
}.catch { error in
resolve.reject(error)
}
}
}
}
I would like to make a generic method for all request. In my code, I made promise type List
and JSONDecoder().decode(List.self), Here I would like to make List type dynamic. How can we do that? I would like to reuse asyncGetRequest method for all the API calls. I want to pass request URL (GET_PROFFESSIONAL) and List class type as dynamic.

Answer 1

You could use Generics and write something like this:
class Http {
class func asyncGetRequest<ListType: Decodable>() -> Promise<ListType> {
return Promise { resolve in
Alamofire.request(GET_PROFFESSIONAL).responseData().done { response in
guard let blog = try? JSONDecoder().decode(ListType.self, from: response.data) else {
let error = MyError(message: "Error: Couldn't decode")
resolve.reject(error)
return
}
resolve.fulfill(blog as ListType)
}.ensure {
}.catch { error in
resolve.reject(error)
}
}
}
}

Answer 2

Alamofire (5.2.2)
PromiseKit (6.13.1)
struct Network {
static func get<Mode: Codable>(url: String) -> Promise<Mode> {
return Promise { seal in
AF.request(url, method: .get, encoding: URLEncoding.default, headers: nil)
.response { response in
if let error = response.error {
seal.reject(error)
return
}
guard let data = response.data else { return }
do {
let items = try JSONDecoder().decode(Mode.self, from: data)
seal.resolve(items, nil)
} catch {
seal.reject(error)
}
}
}
}
}