feat: 实现评论系统（后端 + 前端）
- 新增 Comment/CommentMention 模型，Post 新增 CommentsCount 冗余计数器 - 新增 CommentRepo（CRUD + @搜索 LV3+ + 回复统计 + 文章作者查询） - 新增 CommentService（发表/回复/删除/@解析/通知 NotifyComment/NotifyCommentReply） - 新增 CommentController（6 个 API 端点），commentUseCase ISP 接口 - 新增评论路由（公开读取 + 需登录写入），依赖注入，错误哨兵，数据库迁移 - 前端评论区 HTML/CSS/JS：分页加载、回复折叠展开、内联回复表单、@提及自动补全
This commit is contained in:
198
internal/service/comment_service.go
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198
internal/service/comment_service.go
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package service
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import (
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"errors"
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"fmt"
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"regexp"
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"strings"
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"metazone.cc/metalab/internal/common"
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"metazone.cc/metalab/internal/model"
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"gorm.io/gorm"
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)
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var mentionPattern = regexp.MustCompile(`@(\S{1,16})`)
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// CommentService 评论业务逻辑
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type CommentService struct {
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repo commentStore
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notifier commentNotifier
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}
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// NewCommentService 构造函数
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func NewCommentService(repo commentStore, notifier commentNotifier) *CommentService {
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return &CommentService{repo: repo, notifier: notifier}
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}
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// CreateRoot 创建顶级评论
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func (s *CommentService) CreateRoot(userID uint, postID uint, body string) (*model.Comment, error) {
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if strings.TrimSpace(body) == "" {
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return nil, errors.New("评论内容不能为空")
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}
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postAuthorID, err := s.repo.FindPostAuthorID(postID)
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if err != nil {
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return nil, fmt.Errorf("查询文章失败: %w", err)
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}
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comment := &model.Comment{
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PostID: postID,
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RootID: 0,
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Body: body,
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UserID: userID,
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}
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if err := s.repo.Create(comment); err != nil {
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return nil, fmt.Errorf("创建评论失败: %w", err)
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}
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// RootID 指向自身（UPDATE 而非 INSERT）
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comment.RootID = comment.ID
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if err := s.repo.UpdateRootID(comment.ID, comment.ID); err != nil {
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return nil, fmt.Errorf("更新根评论ID失败: %w", err)
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}
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// 文章评论数+1
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_ = s.repo.IncrCommentsCount(postID)
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// 解析 @ 提及
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s.parseMentions(comment.ID, body)
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// 通知文章作者（评论者 ≠ 作者）
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if s.notifier != nil && userID != postAuthorID {
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commenterUID, _ := s.repo.GetUserUIDByID(userID)
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s.notifier.Create(postAuthorID, model.NotifyComment,
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"新评论",
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fmt.Sprintf("%s 评论了你的文章", commenterUID),
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&comment.ID)
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}
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return comment, nil
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}
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// CreateReply 创建回复
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func (s *CommentService) CreateReply(userID uint, parentID uint, body string) (*model.Comment, error) {
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if strings.TrimSpace(body) == "" {
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return nil, errors.New("回复内容不能为空")
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}
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parent, err := s.repo.FindByID(parentID)
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, errors.New("父评论不存在")
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}
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return nil, fmt.Errorf("查询父评论失败: %w", err)
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}
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comment := &model.Comment{
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PostID: parent.PostID,
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RootID: parent.RootID,
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ParentID: &parentID,
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Body: body,
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UserID: userID,
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}
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// 获取被回复者UID
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if replyToUID, err := s.repo.GetUserUIDByID(parent.UserID); err == nil {
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comment.ReplyToUID = replyToUID
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}
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if err := s.repo.Create(comment); err != nil {
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return nil, fmt.Errorf("创建回复失败: %w", err)
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}
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// 文章评论数+1
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_ = s.repo.IncrCommentsCount(parent.PostID)
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// 解析 @ 提及
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s.parseMentions(comment.ID, body)
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// 通知被回复者（不自己回复自己）
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if s.notifier != nil && parent.UserID != userID {
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commenterUID, _ := s.repo.GetUserUIDByID(userID)
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s.notifier.Create(parent.UserID, model.NotifyCommentReply,
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"新回复",
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fmt.Sprintf("%s 回复了你的评论", commenterUID),
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&comment.ID)
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}
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return comment, nil
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}
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// Delete 软删除评论
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func (s *CommentService) Delete(commentID uint) error {
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comment, err := s.repo.FindByID(commentID)
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return errors.New("评论不存在")
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}
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return fmt.Errorf("查询评论失败: %w", err)
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}
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if comment.IsDeleted {
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return nil
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}
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if err := s.repo.SoftDelete(commentID); err != nil {
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return fmt.Errorf("删除评论失败: %w", err)
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}
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_ = s.repo.DecrCommentsCount(comment.PostID)
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return nil
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}
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// ListRootComments 分页获取文章顶级评论
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func (s *CommentService) ListRootComments(postID uint, page, pageSize int) ([]model.Comment, int64, error) {
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p := common.Pagination{Page: page, PageSize: pageSize}
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p.DefaultPagination()
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return s.repo.FindRootComments(postID, p.Offset(), p.PageSize)
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}
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// ListReplies 获取某条顶级评论的全部回复
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func (s *CommentService) ListReplies(rootID uint) ([]model.Comment, error) {
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list, err := s.repo.FindReplies(rootID)
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if err != nil {
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return nil, fmt.Errorf("查询回复失败: %w", err)
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}
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if list == nil {
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list = []model.Comment{}
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}
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return list, nil
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}
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// SearchUsers 搜索LV3+用户（用于@艾特）
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func (s *CommentService) SearchUsers(keyword string) ([]model.UserSearchResult, error) {
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rows, err := s.repo.SearchUsersByLevel(keyword, 3, 10)
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if err != nil {
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return nil, fmt.Errorf("搜索用户失败: %w", err)
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}
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users := make([]model.UserSearchResult, len(rows))
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for i, row := range rows {
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users[i] = model.UserSearchResult{
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UID: row.UID,
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Username: row.Username,
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Level: 0,
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}
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}
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return users, nil
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}
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// parseMentions 解析@用户并存储到 comment_mentions 表
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func (s *CommentService) parseMentions(commentID uint, body string) {
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matches := mentionPattern.FindAllStringSubmatch(body, -1)
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seen := make(map[string]bool)
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for _, m := range matches {
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username := m[1]
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if seen[username] {
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continue
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}
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seen[username] = true
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rows, _ := s.repo.SearchUsersByLevel(username, 0, 1)
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if len(rows) > 0 {
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_ = s.repo.CreateMention(&model.CommentMention{
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CommentID: commentID,
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UID: rows[0].UID,
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})
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}
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}
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}
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@ -115,3 +115,28 @@ type energyStore = EnergyStore
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type energyNotifier interface {
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Create(userID uint, notifyType, title, content string, relatedID *uint) error
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}
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// commentStore CommentService 所需的最小仓储接口（ISP）
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type commentStore interface {
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Create(comment *model.Comment) error
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UpdateRootID(id, rootID uint) error
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FindByID(id uint) (*model.Comment, error)
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FindRootComments(postID uint, offset, limit int) ([]model.Comment, int64, error)
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FindReplies(rootID uint) ([]model.Comment, error)
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SoftDelete(id uint) error
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IncrCommentsCount(postID uint) error
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DecrCommentsCount(postID uint) error
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CreateMention(mention *model.CommentMention) error
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FindPostIDByComment(commentID uint) (uint, error)
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FindPostAuthorID(postID uint) (uint, error)
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SearchUsersByLevel(keyword string, minLevel, limit int) ([]struct {
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UID string
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Username string
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}, error)
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GetUserUIDByID(userID uint) (string, error)
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}
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// commentNotifier CommentService 所需的通知接口（ISP）
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type commentNotifier interface {
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Create(userID uint, notifyType, title, content string, relatedID *uint) error
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}
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