fix: 챗봇 생성 로직 수정

Author: HSHwan

src/main/java/com/forink/forink/chat/application/ChatService.java

@@ -22,6 +22,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+@Transactional
 @Service
 @RequiredArgsConstructor
 public class ChatService {
@@ -35,13 +36,13 @@ public class ChatService {
     private final AiClient aiClient;
 
     public ChatCreateResponse createChat(final Member member) {
-        final Chat chat = chatRepository.save(Chat.builder()
-                .member(member)
-                .build());
+        final Chat chat = chatRepository.findByMember_Id(member.getId())
+                .orElseGet(() -> chatRepository.save(Chat.builder()
+                        .member(member)
+                        .build()));
         return ChatCreateResponse.from(chat);
     }
 
-    @Transactional
     public ChatAnswerResponse sendMessage(final Member member,
                                           final Long chatId,
                                           final String message) {

src/main/java/com/forink/forink/chat/entity/dao/ChatRepository.java

@@ -1,7 +1,10 @@
 package com.forink.forink.chat.entity.dao;
 
 import com.forink.forink.chat.entity.Chat;
+import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface ChatRepository extends JpaRepository<Chat, Long> {
+
+    Optional<Chat> findByMember_Id(Long memberId);
 }