Fix/chatting api hotfix

src/main/java/com/assu/server/domain/chat/converter/ChatConverter.java

@@ -49,8 +49,17 @@ public static ChatResponseDTO.CreateChatRoomResponseDTO toCreateChatRoomIdDTO(Ch
                 .roomId(room.getId())
                 .adminViewName(room.getPartner().getName())
                 .partnerViewName(room.getAdmin().getName())
+                .isNew(true)
                 .build();
+    }
 
+    public static ChatResponseDTO.CreateChatRoomResponseDTO toEnterChatRoomDTO(ChattingRoom room) {
+        return ChatResponseDTO.CreateChatRoomResponseDTO.builder()
+                .roomId(room.getId())
+                .adminViewName(room.getPartner().getName())
+                .partnerViewName(room.getAdmin().getName())
+                .isNew(false)
+                .build();
     }
 
     public static Message toMessageEntity(ChatRequestDTO.ChatMessageRequestDTO request, ChattingRoom room, Member sender, Member receiver) {

src/main/java/com/assu/server/domain/chat/dto/ChatResponseDTO.java

@@ -21,6 +21,7 @@ public static class CreateChatRoomResponseDTO {
         private Long roomId;
         private String adminViewName;
         private String partnerViewName;
+        private Boolean isNew;
     }
 
     // 메시지 전송

src/main/java/com/assu/server/domain/chat/repository/ChatRepository.java

@@ -5,6 +5,7 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
+
 import java.util.List;
 
 public interface ChatRepository extends JpaRepository<ChattingRoom, Long> {
@@ -68,4 +69,24 @@ SELECT MAX(m2.createdAt)
     """)
     List<ChatRoomListResultDTO> findChattingRoomsByMemberId(@Param("memberId") Long memberId);
 
+    @Query("""
+        SELECT CASE WHEN COUNT(c) > 0 THEN true ELSE false END
+        FROM ChattingRoom c
+        WHERE c.admin.id = :adminId AND c.partner.id = :partnerId
+    """)
+    Boolean checkChattingRoomByAdminIdAndPartnerId(
+            @Param("adminId") Long adminId,
+            @Param("partnerId") Long partnerId
+    );
+
+
+    @Query("""
+        SELECT c
+        FROM ChattingRoom c
+        WHERE c.admin.id = :adminId AND c.partner.id = :partnerId
+    """)
+    ChattingRoom findChattingRoomByAdminIdAndPartnerId(
+            @Param("adminId") Long adminId,
+            @Param("partnerId")Long partnerId
+    );
 }

src/main/java/com/assu/server/domain/chat/service/ChatServiceImpl.java

@@ -67,18 +67,25 @@ public ChatResponseDTO.CreateChatRoomResponseDTO createChatRoom(ChatRequestDTO.C
             throw new DatabaseException(ErrorStatus.NO_SUCH_STORE_WITH_THAT_PARTNER);
         }
 
-        ChattingRoom room = ChatConverter.toCreateChattingRoom(admin, partner);
+        boolean isExist = chatRepository.checkChattingRoomByAdminIdAndPartnerId(admin.getId(), partner.getId());
 
-        room.updateStatus(ActivationStatus.ACTIVE);
+        if(!isExist) {
+            ChattingRoom room = ChatConverter.toCreateChattingRoom(admin, partner);
 
-        room.updateMemberCount(2);
+            room.updateStatus(ActivationStatus.ACTIVE);
 
-        room.updateName(
-                partner.getName(),
-                admin.getName()
-        );
-        ChattingRoom savedRoom = chatRepository.save(room);
-        return ChatConverter.toCreateChatRoomIdDTO(savedRoom);
+            room.updateMemberCount(2);
+
+            room.updateName(
+                    partner.getName(),
+                    admin.getName()
+            );
+            ChattingRoom savedRoom = chatRepository.save(room);
+            return ChatConverter.toCreateChatRoomIdDTO(savedRoom);
+        } else {
+            ChattingRoom existChatRoom = chatRepository.findChattingRoomByAdminIdAndPartnerId(admin.getId(), partner.getId());
+            return ChatConverter.toEnterChatRoomDTO(existChatRoom);
+        }
     }
 
     @Override