fix(posts): Copilot CR 6 条健壮性修复（N+1/404/409/slug）#36
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- N+1：findFeedWithAuthor 改 JOIN 一次取回作者字段，消除 service 层逐行 findById - update() slug 规范化：前端传入的 slug 统一经 sanitizeSlug()，与 create 行为一致 - requirePost() 改抛 ResourceNotFoundException（404），GlobalExceptionHandler 单独处理 - create() / update() 捕获 DuplicateKeyException 返回 409（参考 SharedLinkController） - repository.update() 返回 int（affected rows）；0 行时 service 抛 404 而非 IllegalStateException Co-authored-by: copilot-pull-request-reviewer[bot] <198982749+copilot-pull-request-reviewer[bot]@users.noreply.github.com>
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Pull request overview
该 PR 针对 posts 模块在 #35 合并后提出的健壮性问题做集中修复，目标是改进 feed 查询性能、规范 slug 处理，并将若干异常场景从 400/500 调整为更合理的 404/409 响应语义。
Changes:
listFeed去除 service 层 N+1 查询，改为 repository JOIN 一次取回作者字段update统一对传入 slug 做sanitizeSlug()，并用受影响行数判断并发删除场景返回 404- 新增
ResourceNotFoundException并在GlobalExceptionHandler中映射为 404；create/update捕获DuplicateKeyException返回 409
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.
Show a summary per file
| File | Description |
|---|---|
| src/main/java/com/involutionhell/backend/posts/service/PostService.java | update slug 规范化、并发删除 404、feed 改走 JOIN 查询 |
| src/main/java/com/involutionhell/backend/posts/repository/PostRepository.java | repository 接口调整：feed 改为返回带作者信息的结果；update 返回受影响行数 |
| src/main/java/com/involutionhell/backend/posts/repository/JdbcPostRepository.java | 实现 JOIN 查询的 feed 方法；update 改返回 int |
| src/main/java/com/involutionhell/backend/posts/controller/PostController.java | create/update 捕获重复键异常并返回 409 |
| src/main/java/com/involutionhell/backend/common/error/ResourceNotFoundException.java | 新增 404 语义业务异常类型 |
| src/main/java/com/involutionhell/backend/common/error/GlobalExceptionHandler.java | 新增 ResourceNotFoundException → 404 映射 |
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| public List<PostSummaryView> findFeedWithAuthor(int limit, int offset) { | ||
| // JOIN user_accounts 一次拿回作者字段，消除 service 层 N+1 查询 | ||
| String sql = "SELECT p.id, p.author_id, p.slug, p.title, p.description, p.tags, " | ||
| + "p.cover_url, p.visibility, p.status, p.promoted_pr_url, " | ||
| + "p.view_count, p.created_at, p.updated_at, " | ||
| + "u.username AS author_username, " | ||
| + "u.display_name AS author_display_name, " | ||
| + "u.avatar_url AS author_avatar_url " | ||
| + "FROM posts p " | ||
| + "LEFT JOIN user_accounts u ON u.id = p.author_id " | ||
| + "WHERE p.status = ? AND p.visibility = ? " | ||
| + "ORDER BY p.created_at DESC LIMIT ? OFFSET ?"; | ||
| return jdbc.query(sql, (rs, rowNum) -> { | ||
| Post p = rowMapper.mapRow(rs, rowNum); | ||
| String username = rs.getString("author_username"); |
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| /** | ||
| * 公开 feed 列表：status=PUBLISHED + visibility=PUBLIC，按 created_at DESC 分页。 | ||
| * JOIN user_accounts 一次取回作者信息，避免 service 层 N+1 查询。 | ||
| * limit 上限由 Service 层限定，避免超大 offset 拖垮 DB。 | ||
| */ | ||
| List<Post> findFeed(int limit, int offset); | ||
| List<PostSummaryView> findFeedWithAuthor(int limit, int offset); | ||
|
|
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| } catch (DuplicateKeyException e) { | ||
| return ResponseEntity.status(HttpStatus.CONFLICT) | ||
| .body(new ApiResponse<>(false, "slug 已被占用，请修改文件名后重试", null)); | ||
| } |
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| } catch (DuplicateKeyException e) { | ||
| return ResponseEntity.status(HttpStatus.CONFLICT) | ||
| .body(new ApiResponse<>(false, "slug 已被占用，请修改文件名后重试", null)); | ||
| } |
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| @ExceptionHandler(ResourceNotFoundException.class) | ||
| public ResponseEntity<ApiResponse<Void>> handleResourceNotFound(ResourceNotFoundException e) { | ||
| return ResponseEntity.status(HttpStatus.NOT_FOUND) | ||
| .body(ApiResponse.fail(e.getMessage())); | ||
| } |
longsizhuo
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May 24, 2026
#36 的 JOIN SQL 只 SELECT 了部分列，rowMapper 读 content_md 时 PSQLException: column not found。改 SELECT p.* 保留全列， author_* 别名列追加在后，rowMapper 正常工作。
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背景
针对 #35 合并后 Copilot 提出的 6 条 CR，逐条修复。
修复清单
listFeedN+1：每篇 post 单独查user_accountsfindFeedWithAuthor改用LEFT JOIN user_accounts一次取回作者字段update()slug 未 sanitizesanitizeSlug()（小写/连字符/长度限制），与create行为一致requirePost()抛IllegalArgumentException→ 400ResourceNotFoundException，GlobalExceptionHandler 映射为 404create()未 catchDuplicateKeyException→ 500update()同上update()并发删除后IllegalStateException→ 400repository.update返回intaffected rows；0 行抛 404验证
./mvnw -q -DskipTests package编译通过，无输出。Co-authored-by: copilot-pull-request-reviewer[bot] <198982749+copilot-pull-request-reviewer[bot]@users.noreply.github.com>