username in leaderboard

plugins/match.go

@@ -253,13 +253,21 @@ func (m *TicTacToeMatch) MatchLoop(
         }
 
         winnerUserId := s.Players[winningIndex]
+        account, acc_err := nk.AccountGetId(ctx, winnerUserId)
+        winnerUsername := ""
+        if acc_err != nil {
+            logger.Error("Failed to fetch username for winner %s: %v", winnerUserId, acc_err)
+        } else {
+            winnerUsername = account.GetUser().GetUsername()
+        }
 
+        logger.Info("Winner username=%s userId=%s", winnerUsername, winnerUserId)
         // Write +1 win
         _, err := nk.LeaderboardRecordWrite(
           ctx,
           "tictactoe",                         // leaderboard ID
           winnerUserId,                        // owner ID
-          "",                            // username (optional)
+          winnerUsername,                      // username
           int64(1),                            // score
           int64(0),                            // subscore
           map[string]interface{}{"result": "win"},