Generic function to map JSON objects with ObjectMapper - swift

Question

I have a generic function:
func toObjectMapper<T: Mappable>(mapper: T, success: (result: Mappable) -> Void, failure: (error: NSError) -> Void){
let alomofireApiRequest = AlamofireApiRequest(apiRequest: self)
Alamofire.request(alomofireApiRequest)
.responseObject { (response: Response<T, NSError>) in
guard let value = response.result.value else {
failure(error: response.result.error!)
return
}
success(result: value)
}
}
And I want to call it like this:
public func login(login: String, password: String) -> UserResponse {
let params = ["email":login, "password":password]
let request = ApiRequest(method: .POST, path: "login", parameters: params)
request.toObjectMapper(UserResponse.self, success: { result in
print(result)
}, failure: { error in
print(error.description)
})
}
But I always get this error:
Cannot invoke 'toObjectMapper' with an argument list of type '(UserResponse.Type, success: (result: Mappable) -> Void, failure: (error: NSError) -> Void)'
This is my userResponse:
import Foundation
import ObjectMapper
import RealmSwift
public class UserResponse: Object, Mappable {
dynamic var id = 0
dynamic var name = ""
dynamic var address = ""
dynamic var zipcode = ""
dynamic var city = ""
dynamic var country = ""
dynamic var vat = ""
dynamic var email = ""
dynamic var created_at = NSDate()
dynamic var updated_at = NSDate()
override public static func primaryKey() -> String? {
return "id"
}
//Impl. of Mappable protocol
required convenience public init?(_ map: Map) {
self.init()
}
public func mapping(map: Map) {
id <- map["id"]
name <- map["name"]
address <- map["address"]
zipcode <- map["zipcode"]
city <- map["city"]
country <- map["country"]
vat <- map["vat"]
email <- map["email"]
created_at <- map["created_at"]
updated_at <- map["updated_at"]
}
}
Any help ?

Answer 1

I think the problem is that you are trying to use UserResponse as an instantiated object but using UserResponse.self is only the class type.
A solution is to make UserResonse a singleton (or just instantiate an instance before passing it to 'toObjectMapper' as an argument)
I don't know if this code specifically will work but it's along these lines:-
public class UserResponse: Object, Mappable {
dynamic var id = 0
dynamic var name = ""
dynamic var address = ""
dynamic var zipcode = ""
dynamic var city = ""
dynamic var country = ""
dynamic var vat = ""
dynamic var email = ""
dynamic var created_at = NSDate()
dynamic var updated_at = NSDate()
static let shared = UserResponse() //singleton instantiation
override public static func primaryKey() -> String? {
return "id"
}
//Impl. of Mappable protocol
required convenience public init?(_ map: Map) {
self.init()
}
public func mapping(map: Map) {
id <- map["id"]
name <- map["name"]
address <- map["address"]
zipcode <- map["zipcode"]
city <- map["city"]
country <- map["country"]
vat <- map["vat"]
email <- map["email"]
created_at <- map["created_at"]
updated_at <- map["updated_at"]
}
}
and then in your function call
public func login(login: String, password: String) -> UserResponse {
let params = ["email":login, "password":password]
let request = ApiRequest(method: .POST, path: "login", parameters: params)
request.toObjectMapper(UserResponse.shared, success: { result in
print(result)
}, failure: { error in
print(error.description)
})
}