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@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Overide Back button everywhere.
    UIImage *backButtonImage = [[UIImage imageNamed:@"backButton"]resizableImageWithCapInsets:UIEdgeInsetsMake(0, 15, 0, 3)];
    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    
    return YES;
}

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let customer = Customer(identifier: 1234)
// We want to generate "/customers/1234"

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protocol RestResource {
    static func restName() -> String
    func restId() -> String
}

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func restURL<T:RestResource>(r:T) -> String {
    return "/\(T.restName())/\(r.restId())"
}

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extension Customer:RestResource {
    
    static func restName() -> String {
        return "customers"
    }
    
    func restId() -> String {
        return "\(identifier)"
    }
}

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let customer = Customer(identifier: 1234)
restURL(customer) // -> "/customers/1234"

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struct Customer {
    var identifier:Int = 0
}

struct Product {
    var identifier:Int = 0
}

struct Order {
    var identifier:Int = 0

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protocol Identifiable {
    var identifier:Int {get}
}

struct Customer:Identifiable {
    var identifier:Int = 0
}

struct Product:Identifiable {
    var identifier:Int = 0

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extension RestResource where Self:Identifiable {
    func restId() -> String { return "\(identifier)" }
}

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extension Customer:RestResource {   static func restName() -> String { return "customers" } }
extension Product:RestResource {    static func restName() -> String { return "products" } }
extension Order:RestResource {      static func restName() -> String { return "orders" } }