public Activity()
 {
     Actor = new Actor();
     Action = Models.Action.create.ToString();
     OG_Object = new OG_Object();
     Message = string.Empty;
     users = new List<Actor>();
 }
 public Activity()
 {
     Actor     = new Actor();
     Action    = Models.Action.create.ToString();
     OG_Object = new OG_Object();
     Message   = string.Empty;
     users     = new List <Actor>();
 }