freefire
0c2b0d2d6a
后端 Go+Gin：认证/CSRF/限流、板块、帖子、评论、点赞、通知、用户资料、置顶推荐；前端 Next.js 16：发帖/编辑/删除、搜索、分页、点赞、通知中心、设置；基础设施 docker-compose 与配置模板；添加 .gitignore 与专有许可证（保留所有权利）
123 lines
3.6 KiB
Go
123 lines
3.6 KiB
Go
package service
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import (
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"errors"
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"strings"
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"time"
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"github.com/freefire/jiang13-bbs/model"
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"gorm.io/gorm"
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)
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// CommentService 评论服务
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type CommentService struct {
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db *gorm.DB
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}
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func NewCommentService(db *gorm.DB) *CommentService {
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return &CommentService{db: db}
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}
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// ListByPost 获取帖子的评论列表
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func (s *CommentService) ListByPost(postID uint) ([]model.Comment, error) {
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var comments []model.Comment
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err := s.db.Where("post_id = ? AND status = ?", postID, model.ContentStatusPublished).
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Order("created_at ASC").
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Preload("User").
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Find(&comments).Error
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return comments, err
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}
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// Create 创建评论
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func (s *CommentService) Create(userID, postID uint, content string) (*model.Comment, error) {
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content = strings.TrimSpace(content)
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if content == "" {
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return nil, errors.New("评论内容不能为空")
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}
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// 检查帖子是否存在且未锁定评论
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var post model.Post
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if err := s.db.First(&post, postID).Error; err != nil {
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return nil, errors.New("帖子不存在")
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}
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comment := &model.Comment{
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PostID: postID,
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UserID: userID,
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Content: content,
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Status: model.ContentStatusPublished,
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}
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if err := s.db.Create(comment).Error; err != nil {
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return nil, err
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}
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// 更新帖子评论数
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s.db.Model(&post).UpdateColumn("comment_count", gorm.Expr("comment_count + 1"))
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// 预加载用户
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s.db.Preload("User").First(comment, comment.ID)
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return comment, nil
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}
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// UserCommentItem 用户评论列表项（含帖子标题便于跳转）
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type UserCommentItem struct {
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ID uint `json:"id"`
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PostID uint `json:"post_id"`
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PostTitle string `json:"post_title"`
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Content string `json:"content"`
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CreatedAt time.Time `json:"created_at"`
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}
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// ListByUser 获取指定用户发表的评论（含所属帖子标题）
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func (s *CommentService) ListByUser(userID uint, page, size int) ([]UserCommentItem, int64, error) {
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if page < 1 {
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page = 1
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}
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if size < 1 || size > 50 {
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size = 20
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}
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query := s.db.Table("comments").
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Select("comments.id, comments.post_id, posts.title AS post_title, comments.content, comments.created_at").
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Joins("JOIN posts ON posts.id = comments.post_id").
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Where("comments.user_id = ? AND comments.status = ? AND posts.deleted_at IS NULL", userID, model.ContentStatusPublished)
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var total int64
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if err := query.Count(&total).Error; err != nil {
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return nil, 0, err
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}
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var items []UserCommentItem
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offset := (page - 1) * size
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if err := query.Order("comments.created_at DESC").Offset(offset).Limit(size).Scan(&items).Error; err != nil {
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return nil, 0, err
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}
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return items, total, nil
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}
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// CountByUser 统计用户评论数（仅统计未删除帖子上的评论，与列表保持一致）
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func (s *CommentService) CountByUser(userID uint) (int64, error) {
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var total int64
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err := s.db.Table("comments").
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Joins("JOIN posts ON posts.id = comments.post_id").
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Where("comments.user_id = ? AND comments.status = ? AND posts.deleted_at IS NULL", userID, model.ContentStatusPublished).
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Count(&total).Error
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return total, err
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}
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// Delete 删除评论（仅作者或管理员可操作）
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func (s *CommentService) Delete(commentID, userID uint, role string) error {
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var comment model.Comment
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if err := s.db.First(&comment, commentID).Error; err != nil {
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return errors.New("评论不存在")
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}
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// 权限校验：作者本人或管理员
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if comment.UserID != userID && role != RoleAdmin {
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return errors.New("无权限删除此评论")
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}
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// 软删除
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if err := s.db.Delete(&comment).Error; err != nil {
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return err
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}
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// 更新帖子评论数
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s.db.Model(&model.Post{}).Where("id = ?", comment.PostID).
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UpdateColumn("comment_count", gorm.Expr("GREATEST(comment_count - 1, 0)"))
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return nil
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}
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