 import Foundation
 
 /// Query fields
-public class QueryFields {
+public struct QueryFields {
     static let totalItems = "total_items"
     static let photos = "photos"
     static let currentPage = "current_page"

}

/// Images fields in `PhotoFields.images`
public class ImagesFields {
    static let format = "format"
    static let httpsUrl = "https_url"
    static let size = "size"
    static let url = "url"
}

public class UserFields {
    static let city = "city"
    static let country = "country"
    static let firstname = "firstname"



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