Display multiple markers in the mapView - ios

Question

I'm working with google-maps and i created this function
func addMarker(place:EClass) {
guard let coordinates = place.location else {
return
}
self.destination = coordinates
marker = GMSMarker()
marker?.position = coordinates
marker?.title = place.name
marker?.map = mapView
mapView.selectedMarker = marker
}
to add a marker in my mapView at the position of an object of type EClass; but in my case i need to show different markers on the mapView at the position of each elements of var places: [EClass] = []. To do this i tried to add something like this in my viewDidLoad
let srt = places
srt.forEach { addMarker(place: $0) }
but it doesn't working, so how can i do?
this is my class EClass
import UIKit
import CoreLocation
private let geometryKey = "geometry"
private let locationKey = "location"
private let latitudeKey = "lat"
private let longitudeKey = "lng"
private let nameKey = "name"
private let vicinityKey = "vicinity"
class EClass: NSObject {
var location: CLLocationCoordinate2D?
var name: String?
var vicinity: String?
var placeId: String
init(placeInfo:[String: Any]) {
placeId = placeInfo["place_id"] as! String
// coordinates
if let g = placeInfo[geometryKey] as? [String:Any] {
if let l = g[locationKey] as? [String:Double] {
if let lat = l[latitudeKey], let lng = l[longitudeKey] {
location = CLLocationCoordinate2D.init(latitude: lat, longitude: lng)
}
}
}
// name
name = placeInfo[nameKey] as? String
}
//UPDATE
static func getNearbyPlaces(by category:String, coordinates:CLLocationCoordinate2D, radius:Int, token: String?, completion: #escaping (QNearbyPlacesResponse?, Error?) -> Void) {
var params : [String : Any]
if let t = token {
params = [
"key" : AppDelegate.googlePlacesAPIKey,
"pagetoken" : t,
]
} else {
params = [
"key" : AppDelegate.googlePlacesAPIKey,
"radius" : radius,
"location" : "\(coordinates.latitude),\(coordinates.longitude)",
"type" : category.lowercased()
]
}
Alamofire.request(searchApiHost, parameters: params, encoding: URLEncoding(destination: .queryString)).responseJSON { response in
if let error = response.error {
completion(nil, error)
}
if let response = QNearbyPlacesResponse(dic : response.result.value as? [String : Any]) {
completion(response, nil)
}
else {
completion(nil, QNearbyPlacesResponseError.noParsingDone)
}
}
}