feat: 7일간 가족 걸음 수 랭킹 API 구현

[Neibce]

Summary by CodeRabbit

• 신규 기능
  • 가족 걸음 수 랭킹 조회를 추가했습니다. 금주(월요일부터 오늘까지) 누적 걸음 수를 가족 구성원 수로 나눈 평균 기준으로 순위를 제공합니다.
  • 사용자가 속한 가족을 목록에서 구분 표시합니다.
  • 결과는 평균 걸음 수 기준 내림차순으로 정렬되어 반환됩니다.
  • 기존의 가족별 걸음 수 조회 기능은 변경 없이 그대로 사용할 수 있습니다.

[coderabbitai]

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Walkthrough

주간 기준일(LocalDate.now())로 가족별 평균 걸음 수 순위를 반환하는 신규 REST 엔드포인트(GET /steps/rank)를 추가했다. 이를 위해 랭킹 DTO를 신설하고, 기존 빈 DTO를 제거했으며, 리포지토리에 가족 단위 집계용 프로젝션/쿼리를 도입하고, 서비스에 랭킹 산출 로직과 정렬을 구현했다.

Changes

Cohort / File(s)	Summary of changes
Controller: Rank endpoint backend/ongi/src/main/java/ongi/step/controller/StepController.java	GET /steps/rank 엔드포인트 추가. 현재 사용자와 현재 날짜를 사용해 서비스 getFamilyStepRank 호출 후 응답 반환. 필요한 DTO/컬렉션 import 추가.
DTOs: Rank response 추가/정리 backend/ongi/src/main/java/ongi/step/dto/FamilyStepRankResponse.java, backend/ongi/src/main/java/ongi/step/dto/FamilyStepRankingResponse.java	FamilyStepRankResponse(record) 신규 추가(가족명, 평균걸음, 자가족 여부). 기존 빈 클래스 FamilyStepRankingResponse 삭제.
Repository: 집계 프로젝션 도입 backend/ongi/src/main/java/ongi/step/repository/StepRepository.java	가족별 기간 집계 쿼리 findStepsAndSizeBetween(start,end) 추가와 프로젝션 FamilyStepsAndSizeView 정의. 기존 가족/기간별 상세 조회 및 합계 관련 메서드 3종 제거.
Service: 랭킹 로직 구현 backend/ongi/src/main/java/ongi/step/service/StepService.java	getFamilyStepRank(User, LocalDate) 추가: 주간 시작일부터 지정일까지 가족별 총합과 인원수를 조회해 1인당 평균 계산, 자가족 플래그 설정, 평균 내림차순 정렬. 기존 Ranking 메서드 대체. getFamilySteps에 @transactional 추가(동작 변경 없음).

Sequence Diagram(s)

sequenceDiagram
  participant C as Client
  participant Ctrl as StepController
  participant Svc as StepService
  participant Repo as StepRepository
  participant DB as Database

  C->>Ctrl: GET /steps/rank (authenticated)
  Ctrl->>Svc: getFamilyStepRank(user, today)
  Svc->>Repo: findStepsAndSizeBetween(weekStart, today)
  Repo->>DB: JPQL aggregation (family, steps, memberCount)
  DB-->>Repo: Aggregated rows
  Repo-->>Svc: FamilyStepsAndSizeView list
  Svc-->>Ctrl: List<FamilyStepRankResponse> (sorted by average desc)
  Ctrl-->>C: 200 OK (JSON)

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Poem

토끼 발끝, 또각또각 트랙 위 춤사위 —
가족별 발자국 모아 별처럼 줄 세우네.
주의 첫 아침부터 오늘까지 착착,
평균의 달빛 따라 순위가 반짝!
점프! 제 가족 깃발 아래 더 높이 🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 38210b7 and d8c51d3.

📒 Files selected for processing (5)

• backend/ongi/src/main/java/ongi/step/controller/StepController.java (2 hunks)
• backend/ongi/src/main/java/ongi/step/dto/FamilyStepRankResponse.java (1 hunks)
• backend/ongi/src/main/java/ongi/step/dto/FamilyStepRankingResponse.java (0 hunks)
• backend/ongi/src/main/java/ongi/step/repository/StepRepository.java (1 hunks)
• backend/ongi/src/main/java/ongi/step/service/StepService.java (3 hunks)

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