bug fixed concerning unicity codes

Backend/src/main/java/com/example/model/Attendance.java

@@ -3,7 +3,6 @@
 import org.springframework.beans.factory.annotation.Autowired;
 
 import com.example.services.AttendanceService;
-import com.fasterxml.jackson.annotation.JsonIgnore;
 
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
@@ -12,11 +11,9 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToOne;
 
-import java.security.SecureRandom;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Random;
 
 import jakarta.persistence.OneToMany;
 
@@ -40,20 +37,11 @@ public class Attendance {
     @OneToMany(mappedBy = "attendance")
     private List<UserAttendance> usersPresent = new ArrayList<UserAttendance>();
 
-    private static final int CODE_LENGTH = 6;
-    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
-    private static final Random random = new SecureRandom();
-
-    @Autowired
-    private AttendanceService attendanceService;
-
-    public Attendance(User user, Subject subject) {
+    public Attendance(User user, Subject subject, String code) {
         this.creator = user;
         this.subject = subject;
         dateTime = LocalDateTime.now();
-        do {
-            this.code = generateRandomCode(CODE_LENGTH);
-        } while (attendanceService.isCodeUsed(code));
+        this.code = code;
 
     }
 
@@ -84,14 +72,6 @@ public void setDateTime(LocalDateTime dateTime) {
         this.dateTime = dateTime;
     }
 
-    private String generateRandomCode(int length) {
-        StringBuilder code = new StringBuilder(length);
-        for (int i = 0; i < length; i++) {
-            code.append(CHARACTERS.charAt(random.nextInt(CHARACTERS.length())));
-        }
-        return code.toString();
-    }
-
     public void moreTime() {
         dateTime = LocalDateTime.now();
     }

Backend/src/main/java/com/example/services/AttendanceService.java

@@ -1,6 +1,8 @@
 package com.example.services;
 
+import java.security.SecureRandom;
 import java.util.List;
+import java.util.Random;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -21,8 +23,12 @@ public class AttendanceService {
     @Autowired
     private UserAttendanceRepository userAttendanceRepository;
 
+    private static final int CODE_LENGTH = 6;
+    private static final String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+    private static final Random random = new SecureRandom();
+
     public Attendance newAttendance(User user, Subject subject) {
-        Attendance attendance = new Attendance(user, subject);
+        Attendance attendance = new Attendance(user, subject, generateRandomCode(CODE_LENGTH));
         attendanceRepository.save(attendance);
         return attendance;
 
@@ -57,4 +63,17 @@ public Attendance getAttendanceById(Long id) {
         return attendanceRepository.findById(id).get();
     }
 
+    private String generateRandomCode(int length) {
+        String code;
+        do {
+            StringBuilder codeBuilder = new StringBuilder(length);
+            for (int i = 0; i < length; i++) {
+                codeBuilder.append(CHARACTERS.charAt(random.nextInt(CHARACTERS.length())));
+            }
+            code = codeBuilder.toString();
+        } while (attendanceRepository.existsByCode(code));
+        return code;
+    }
+
+
 }