初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

service/board.go

@@ -0,0 +1,66 @@
+package service
+
+import (
+	"errors"
+
+	"github.com/jiang13/forum/model"
+)
+
+type BoardService struct{}
+
+func NewBoardService() *BoardService {
+	return &BoardService{}
+}
+
+// BoardWithStats 板块及帖子数量
+type BoardWithStats struct {
+	model.Board
+	PostCount int `json:"post_count"`
+}
+
+func (s *BoardService) List() ([]model.Board, error) {
+	var boards []model.Board
+	err := model.DB.Order("sort_order asc, id asc").Find(&boards).Error
+	return boards, err
+}
+
+func (s *BoardService) ListWithStats() ([]BoardWithStats, error) {
+	boards, err := s.List()
+	if err != nil {
+		return nil, err
+	}
+	result := make([]BoardWithStats, len(boards))
+	for i, b := range boards {
+		var count int64
+		model.DB.Model(&model.Post{}).Where("board_id = ?", b.ID).Count(&count)
+		result[i] = BoardWithStats{Board: b, PostCount: int(count)}
+	}
+	return result, nil
+}
+func (s *BoardService) GetByID(id uint) (*model.Board, error) {
+	var board model.Board
+	if err := model.DB.First(&board, id).Error; err != nil {
+		return nil, ErrBoardNotFound
+	}
+	return &board, nil
+}
+
+func (s *BoardService) Create(name, desc string, sortOrder int) (*model.Board, error) {
+	board := &model.Board{Name: name, Description: desc, SortOrder: sortOrder}
+	return board, model.DB.Create(board).Error
+}
+
+func (s *BoardService) Update(id uint, name, desc string, sortOrder int) error {
+	return model.DB.Model(&model.Board{}).Where("id = ?", id).Updates(map[string]interface{}{
+		"name": name, "description": desc, "sort_order": sortOrder,
+	}).Error
+}
+
+func (s *BoardService) Delete(id uint) error {
+	var count int64
+	model.DB.Model(&model.Post{}).Where("board_id = ?", id).Count(&count)
+	if count > 0 {
+		return errors.New("该板块下还有帖子，无法删除")
+	}
+	return model.DB.Delete(&model.Board{}, id).Error
+}