hotfix : 양방향 매핑에 의한 유저 생성 실패 오류 해결

src/main/java/com/neighbors/tohero/infrastructure/entity/RecommendEntity.java

@@ -18,7 +18,7 @@ public class RecommendEntity {
     private String recommendedPeopleName;
 
     @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
-    @JoinColumn(name = "user_id", nullable = false)
+    @JoinColumn(name = "user_id", nullable = true)
     private UserEntity userEntity;
 
     public RecommendEntity(UserEntity user){

src/main/java/com/neighbors/tohero/infrastructure/entity/UserEntity.java

@@ -32,7 +32,7 @@ public class UserEntity extends BaseEntity {
     private String recommenders;
 
     @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
-    @JoinColumn(name = "recommend_id", nullable = false)
+    @JoinColumn(name = "recommend_id", nullable = true)
     private RecommendEntity recommendEntity;
 
     public UserEntity() {

src/main/java/com/neighbors/tohero/infrastructure/query/impl/UserRepositoryImpl.java

@@ -13,6 +13,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Repository;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
@@ -94,7 +95,10 @@ public void reflectRecommendation(String writer, List<String> recommenderEmails)
     public List<String> getNameOfWriters(Function<UserEntityRepository, Optional<UserEntity>> findUserFunction) {
         UserEntity matchedUserEntity = getUserEntity(findUserFunction);
 
-        return Arrays.stream(matchedUserEntity.getRecommendEntity().getRecommendedPeopleName()
+        String recommendedPeopleName = matchedUserEntity.getRecommendEntity().getRecommendedPeopleName();
+
+        if(recommendedPeopleName == null) {return new ArrayList<>();}
+        return Arrays.stream(recommendedPeopleName
                 .split(","))
                 .toList();
     }