public static Walk MapToWalk(this WalkDTO model)
        {
            Walk walk = new Walk();

            walk.StartTime = model.StartTime != null ? model.StartTime : walk.StartTime;
            walk.EndTime   = model.EndTime != null ? walk.EndTime : model.EndTime;
            walk.SetCoords(model.Coordinates);
            walk.WalkedPath.LineColor = model.LineColor;
            return(walk);
        }