fix: 닉네임 조회 실패 시 고정 닉네임으로 생성

src/main/java/com/swyp8team2/user/application/NicknameGenerator.java

@@ -12,9 +12,8 @@ public class NicknameGenerator {
     private final NicknameAdjectiveRepository nicknameAdjectiveRepository;
 
     public String generate(Role role) {
-        long randomIndex = (long)(Math.random() * 500);
-        return nicknameAdjectiveRepository.findNicknameAdjectiveById(randomIndex)
+        return nicknameAdjectiveRepository.findRandomNicknameAdjective()
                 .map(adjective -> adjective.getAdjective() + " " + role.getNickname())
-                .orElse("user_" + System.currentTimeMillis());
+                .orElse("숨겨진 " + role.getNickname());
     }
 }

src/main/java/com/swyp8team2/user/domain/NicknameAdjectiveRepository.java

@@ -1,12 +1,20 @@
 package com.swyp8team2.user.domain;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 
 import java.util.Optional;
 
 @Repository
 public interface NicknameAdjectiveRepository extends JpaRepository<NicknameAdjective, Long> {
 
-    Optional<NicknameAdjective> findNicknameAdjectiveById(Long id);
+    @Query("""
+            SELECT na
+            FROM NicknameAdjective na
+            ORDER BY RAND()
+            LIMIT 1
+            """
+    )
+    Optional<NicknameAdjective> findRandomNicknameAdjective();
 }

src/test/java/com/swyp8team2/user/application/NicknameGeneratorTest.java

@@ -32,7 +32,7 @@ class NicknameGeneratorTest {
     void generate() throws Exception {
         //given
         Role role = Role.USER;
-        given(nicknameAdjectiveRepository.findNicknameAdjectiveById(any()))
+        given(nicknameAdjectiveRepository.findRandomNicknameAdjective())
                 .willReturn(Optional.of(new NicknameAdjective("호기심 많은")));
 
         //when
@@ -47,7 +47,7 @@ void generate() throws Exception {
     void generate_guest() throws Exception {
         //given
         Role role = Role.GUEST;
-        given(nicknameAdjectiveRepository.findNicknameAdjectiveById(any()))
+        given(nicknameAdjectiveRepository.findRandomNicknameAdjective())
                 .willReturn(Optional.of(new NicknameAdjective("호기심 많은")));
 
         //when