public Slot UnPark(int id, [FromBody] string value)
 {
     using (var manager = new SlotManager())
     {
         var freedUpSlot = manager.FreeUpSlot(new Slot()
         {
             Id = id
         });
         manager.SaveChanges();
         var json = JsonConvert.SerializeObject(freedUpSlot, Formatting.Indented,
                                                new JsonSerializerSettings
         {
             ReferenceLoopHandling = ReferenceLoopHandling.Ignore
         });
         return(JsonConvert.DeserializeObject <Slot>(json));
     }
 }