 }
 
 /// Images fields in `PhotoFields.images`
-public class ImagesFields {
+public struct ImagesFields {
     static let format = "format"
     static let httpsUrl = "https_url"
     static let size = "size"
     static let url = "url"
 }
 
-public class UserFields {
+public struct UserFields {
     static let city = "city"
     static let country = "country"
     static let firstname = "firstname"



/// Photo fields in `QueryFields.photos`
public class PhotoFields {
    static let aperture = "aperture"
    static let category = "category"
    static let collectionsCount = "collections_count"

import Foundation

/// Query fields
public struct QueryFields {
    static let totalItems = "total_items"
    static let photos = "photos"
    static let currentPage = "current_page"
