added UUID in MongoUserService.java and ActivityService.java

fixed an type error in DayView.tsx

backend/src/main/java/de/neuefische/backend/IdService/IdService.java

@@ -0,0 +1,13 @@
+package de.neuefische.backend.IdService;
+
+import org.springframework.stereotype.Service;
+
+import java.util.UUID;
+
+@Service
+public class IdService {
+
+    public String generateId() {
+        return UUID.randomUUID().toString();
+    }
+}

backend/src/main/java/de/neuefische/backend/Security/MongoUserService.java

@@ -1,5 +1,6 @@
 package de.neuefische.backend.Security;
 
+import de.neuefische.backend.IdService.IdService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
@@ -16,6 +17,7 @@
 public class MongoUserService implements UserDetailsService {
 
     private final MongoUserRepository mongoUserRepository;
+    private final IdService idService;
 
     @Override
     public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
@@ -29,7 +31,7 @@ public MongoUser saveUser(MongoUser user){
             throw new IllegalArgumentException("Username already taken");
         }
         PasswordEncoder encoder = Argon2PasswordEncoder.defaultsForSpringSecurity_v5_8();
-        mongoUserRepository.save(user.withPassword(encoder.encode(user.getPassword())));     // user -> setPassword(encoder(user.getPassword))
+        mongoUserRepository.save(user.withPassword(encoder.encode(user.getPassword())).withId(idService.generateId()));     // user -> setPassword(encoder(user.getPassword))
         return user;
     }
 

backend/src/main/java/de/neuefische/backend/activity/Activity.java

@@ -3,8 +3,10 @@
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
+import lombok.With;
 
 @Data
+@With
 @AllArgsConstructor
 @NoArgsConstructor
 public class Activity {

backend/src/main/java/de/neuefische/backend/activity/ActivityService.java

@@ -1,5 +1,6 @@
 package de.neuefische.backend.activity;
 
+import de.neuefische.backend.IdService.IdService;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import org.springframework.stereotype.Service;
@@ -12,9 +13,10 @@
 public class ActivityService {
 
     private ActivityRepository activityRepository;
+    private IdService idService;
 
     public Activity addActivity(Activity activity) {
-        return activityRepository.save(activity);
+        return activityRepository.save(activity.withId(idService.generateId()));
     }
 
     public List<Activity> getAllActivities() {