채팅 조회 API cursor-id 수정

[ggamnunq]

cursor-id에 "null" 혹은 빈칸이 들어가도 조회되도록 수정

Summary by CodeRabbit

• 버그 수정
  • 채팅 기록 초기 로드 시 cursorId가 비어 있거나 "null"인 경우에도 최신 메시지가 안정적으로 표시됩니다.
  • 이후 페이지 로딩에서는 커서 이전 메시지만 정확히 불러와 스크롤/페이지네이션이 매끄럽습니다.
  • 메시지 정렬과 시간순 표시의 일관성이 개선되었습니다.
  • 과도한 페이지 크기 요청에 대한 제한 동작은 기존과 동일하게 유지됩니다.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

채팅 히스토리 조회 로직에서 cursorId 판단 기준을 공백/문자열 "null" 포함으로 확장하고, 초기 조회 시 최신 메시지, 유효한 커서가 있을 때 커서 미만 ID 기준 조회로 분기합니다. 페이지 사이즈 유효성 검사는 동일하며, 이후 사용자 매핑과 DTO 구성 흐름은 그대로 유지됩니다.

Changes

Cohort / File(s)	Change Summary
Chat history retrieval logic src/main/kotlin/busanVibe/busan/domain/chat/service/ChatMongoService.kt	- cursorId 분기 조건을 `cursorId.isNullOrBlank()

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant Client
  participant ChatMongoService
  participant ChatRepository
  participant UserRepository

  Client->>ChatMongoService: getChatHistory(cursorId, pageSize)
  ChatMongoService->>ChatMongoService: validate pageSize
  alt 초기 조회 (cursorId가 null/blank/"null")
    ChatMongoService->>ChatRepository: findAllByTypeOrderByTimeDesc(CHAT, Pageable(pageSize))
  else 커서 기반 조회
    ChatMongoService->>ChatRepository: findByIdLessThanAndTypeOrderByTimeDesc(cursorId, CHAT, Pageable(pageSize))
  end
  ChatRepository-->>ChatMongoService: messages
  ChatMongoService->>UserRepository: findAllById(userIds from messages)
  UserRepository-->>ChatMongoService: users
  ChatMongoService-->>Client: ChatMessageResponseDTO.ListDto

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

토깽이, 수풀 속 채팅줄 따라가네
"null"도 공백도, 이제 길잡이네
처음엔 최신, 커서 땐 그전 이야기
살금살금 페이지를 톡톡 넘기니
대화의 발자국이 밤하늘처럼 반짝 🌙🐇

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📥 Commits

Reviewing files that changed from the base of the PR and between d5cf613 and 04b437f.

📒 Files selected for processing (1)

• src/main/kotlin/busanVibe/busan/domain/chat/service/ChatMongoService.kt (2 hunks)

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