From ce85b51af310a4c967bd1f124db1d9accb039047 Mon Sep 17 00:00:00 2001
From: Paul Reichmuth <p.n.reichmuth@gmail.com>
Date: Thu, 18 Dec 2025 15:37:15 +0100
Subject: [PATCH] introduce duplicate checks for Racers in RacerService.java

---
 .../services/RacerService.java                | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/main/java/de/pnreichmuth/timekeep_backend/services/RacerService.java b/src/main/java/de/pnreichmuth/timekeep_backend/services/RacerService.java
index 47de49b..75cae77 100644
--- a/src/main/java/de/pnreichmuth/timekeep_backend/services/RacerService.java
+++ b/src/main/java/de/pnreichmuth/timekeep_backend/services/RacerService.java
@@ -3,13 +3,12 @@ package de.pnreichmuth.timekeep_backend.services;
 import de.pnreichmuth.timekeep_backend.entities.Racer;
 import de.pnreichmuth.timekeep_backend.exceptions.RacerExistsException;
 import de.pnreichmuth.timekeep_backend.exceptions.RacerNotFoundException;
-import de.pnreichmuth.timekeep_backend.exceptions.TeamNotFoundException;
 import de.pnreichmuth.timekeep_backend.repositories.RacerRepository;
-import de.pnreichmuth.timekeep_backend.repositories.TeamRepository;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
 import java.util.UUID;
 
 @Service
@@ -18,8 +17,20 @@ import java.util.UUID;
 public class RacerService {
     private final RacerRepository racerRepository;
 
-    public Racer createRacer(Racer racer){
-        return racerRepository.save(racer);
+    private void checkRacerIsDuplicate(Racer racer){
+        List<Racer> racers = racerRepository.findAll();
+        if(racers.isEmpty()){
+            return;
+        }
+        if (racers.stream()
+                .anyMatch(
+                        dbRacer -> dbRacer.getFirstName().equals(
+                                racer.getFirstName())
+                                && dbRacer.getLastName().equals(racer.getLastName())
+                                && !dbRacer.getRacerID().equals(racer.getRacerID())))
+        {
+            throw new RacerExistsException("A racer by this name already exists.", racer);
+        }
     }
 
     public Racer createRacer(String firstName, String lastName, boolean isFirstSemester){