private Task <Option <Domain.Entities.Restaurant, Error> > EnsureRestaurantExistsAsync( string restaurantId) => RestaurantRepository .GetByIdAsync(restaurantId) .SomeNotNull(Error.NotFound($"Restaurant with ID `{restaurantId}` does not exists!"));
private Task <Option <Domain.Entities.Restaurant, Error> > EnsureRestaurantExistsAsync( string restaurantId) => RestaurantRepository .GetByIdAsync(restaurantId) .SomeNotNull(Error.NotFound($"Restaurant with ID `{restaurantId}` does not exists!"));