feat(material): add material handling and routing functionality

- Introduced MaterialHandler for managing learning materials and subjects.
- Updated router to include routes for public and admin material management.
- Enhanced database initialization with material subject and file models.
- Implemented seeding logic for material subjects and files.
- Updated wire generation to include MaterialHandler and related services.

cmd/server/wire.go

@@ -46,6 +46,7 @@ func ProvideRouter(
 	adminDashboardHandler *handler.AdminDashboardHandler,
 	adminLogHandler *handler.AdminLogHandler,
 	qrcodeHandler *handler.QRCodeHandler,
+	materialHandler *handler.MaterialHandler,
 	logService *service.LogService,
 	activityService service.UserActivityService,
 	casbinService service.CasbinService,
@@ -73,6 +74,7 @@ func ProvideRouter(
 		adminDashboardHandler,
 		adminLogHandler,
 		qrcodeHandler,
+		materialHandler,
 		logService,
 		activityService,
 		casbinService,

internal/handler/material_handler.go

@@ -0,0 +1,490 @@
+package handler
+
+import (
+	"strconv"
+
+	"carrot_bbs/internal/model"
+	"carrot_bbs/internal/pkg/response"
+	"carrot_bbs/internal/repository"
+	"carrot_bbs/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+// MaterialHandler 学习资料处理器
+type MaterialHandler struct {
+	materialService service.MaterialService
+}
+
+// NewMaterialHandler 创建学习资料处理器
+func NewMaterialHandler(materialService service.MaterialService) *MaterialHandler {
+	return &MaterialHandler{materialService: materialService}
+}
+
+// =====================================================
+// 响应结构体
+// =====================================================
+
+type subjectResponse struct {
+	ID            string `json:"id"`
+	Name          string `json:"name"`
+	Icon          string `json:"icon"`
+	Color         string `json:"color"`
+	Description   string `json:"description,omitempty"`
+	SortOrder     int    `json:"sort_order"`
+	IsActive      bool   `json:"is_active"`
+	MaterialCount int    `json:"material_count"`
+	CreatedAt     string `json:"created_at"`
+	UpdatedAt     string `json:"updated_at"`
+}
+
+type materialResponse struct {
+	ID            string            `json:"id"`
+	SubjectID     string            `json:"subject_id"`
+	Title         string            `json:"title"`
+	Description   string            `json:"description,omitempty"`
+	FileType      string            `json:"file_type"`
+	FileSize      int64             `json:"file_size"`
+	FileURL       string            `json:"file_url"`
+	FileName      string            `json:"file_name"`
+	DownloadCount int               `json:"download_count"`
+	AuthorID      string            `json:"author_id,omitempty"`
+	Tags          []string          `json:"tags,omitempty"`
+	Status        string            `json:"status"`
+	CreatedAt     string            `json:"created_at"`
+	UpdatedAt     string            `json:"updated_at"`
+	Subject       *subjectResponse  `json:"subject,omitempty"`
+}
+
+// =====================================================
+// 转换函数
+// =====================================================
+
+func toSubjectResponse(s *model.MaterialSubject, materialCount int64) *subjectResponse {
+	if s == nil {
+		return nil
+	}
+	return &subjectResponse{
+		ID:            s.ID,
+		Name:          s.Name,
+		Icon:          s.Icon,
+		Color:         s.Color,
+		Description:   s.Description,
+		SortOrder:     s.SortOrder,
+		IsActive:      s.IsActive,
+		MaterialCount: int(materialCount),
+		CreatedAt:     s.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		UpdatedAt:     s.UpdatedAt.Format("2006-01-02T15:04:05Z07:00"),
+	}
+}
+
+func toMaterialResponse(f *model.MaterialFile) *materialResponse {
+	if f == nil {
+		return nil
+	}
+	var subjectResp *subjectResponse
+	if f.Subject != nil {
+		subjectResp = toSubjectResponse(f.Subject, 0)
+	}
+	return &materialResponse{
+		ID:            f.ID,
+		SubjectID:     f.SubjectID,
+		Title:         f.Title,
+		Description:   f.Description,
+		FileType:      string(f.FileType),
+		FileSize:      f.FileSize,
+		FileURL:       f.FileURL,
+		FileName:      f.FileName,
+		DownloadCount: f.DownloadCount,
+		AuthorID:      f.AuthorID,
+		Tags:          f.Tags,
+		Status:        string(f.Status),
+		CreatedAt:     f.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		UpdatedAt:     f.UpdatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		Subject:       subjectResp,
+	}
+}
+
+// =====================================================
+// 公开API - 学科相关
+// =====================================================
+
+// ListSubjects 公开学科列表（仅启用）
+func (h *MaterialHandler) ListSubjects(c *gin.Context) {
+	items, err := h.materialService.ListActiveSubjects()
+	if err != nil {
+		response.InternalServerError(c, "failed to get subjects")
+		return
+	}
+	result := make([]*subjectResponse, 0, len(items))
+	for _, item := range items {
+		_, count, _ := h.materialService.GetSubjectByIDWithMaterialCount(item.ID)
+		result = append(result, toSubjectResponse(item, count))
+	}
+	response.Success(c, gin.H{"list": result})
+}
+
+// GetSubject 获取学科详情
+func (h *MaterialHandler) GetSubject(c *gin.Context) {
+	id := c.Param("id")
+	item, count, err := h.materialService.GetSubjectByIDWithMaterialCount(id)
+	if err != nil {
+		response.NotFound(c, "subject not found")
+		return
+	}
+	response.Success(c, toSubjectResponse(item, count))
+}
+
+// =====================================================
+// 公开API - 资料相关
+// =====================================================
+
+// ListMaterials 资料列表
+func (h *MaterialHandler) ListMaterials(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	subjectID := c.Query("subject_id")
+	fileType := c.Query("file_type")
+	keyword := c.Query("keyword")
+
+	params := repository.MaterialFileQueryParams{
+		SubjectID: subjectID,
+		FileType:  fileType,
+		Keyword:   keyword,
+		Status:    string(model.MaterialStatusActive),
+		Page:      page,
+		PageSize:  pageSize,
+		SortBy:    "created_at",
+		SortOrder: "DESC",
+	}
+
+	items, total, err := h.materialService.ListMaterials(params)
+	if err != nil {
+		response.InternalServerError(c, "failed to get materials")
+		return
+	}
+
+	result := make([]*materialResponse, 0, len(items))
+	for _, item := range items {
+		result = append(result, toMaterialResponse(item))
+	}
+
+	response.Success(c, gin.H{
+		"list":       result,
+		"total":      total,
+		"page":       page,
+		"page_size":  pageSize,
+		"has_more":   int64(page*pageSize) < total,
+	})
+}
+
+// GetMaterial 获取资料详情
+func (h *MaterialHandler) GetMaterial(c *gin.Context) {
+	id := c.Param("id")
+	item, err := h.materialService.GetMaterialByIDWithSubject(id)
+	if err != nil {
+		response.NotFound(c, "material not found")
+		return
+	}
+	response.Success(c, toMaterialResponse(item))
+}
+
+// SearchMaterials 搜索资料
+func (h *MaterialHandler) SearchMaterials(c *gin.Context) {
+	keyword := c.Query("keyword")
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+
+	items, total, err := h.materialService.SearchMaterials(keyword, page, pageSize)
+	if err != nil {
+		response.InternalServerError(c, "failed to search materials")
+		return
+	}
+
+	result := make([]*materialResponse, 0, len(items))
+	for _, item := range items {
+		result = append(result, toMaterialResponse(item))
+	}
+
+	response.Success(c, gin.H{
+		"list":      result,
+		"total":     total,
+		"page":      page,
+		"page_size": pageSize,
+		"has_more":  int64(page*pageSize) < total,
+	})
+}
+
+// DownloadMaterial 下载资料（增加下载次数）
+func (h *MaterialHandler) DownloadMaterial(c *gin.Context) {
+	id := c.Param("id")
+	item, err := h.materialService.GetMaterialByID(id)
+	if err != nil {
+		response.NotFound(c, "material not found")
+		return
+	}
+	// 增加下载次数
+	_ = h.materialService.IncrementDownloadCount(id)
+	// 返回下载链接
+	response.Success(c, gin.H{
+		"id":        item.ID,
+		"file_url":  item.FileURL,
+		"file_name": item.FileName,
+	})
+}
+
+// =====================================================
+// 管理API - 学科相关
+// =====================================================
+
+// AdminListSubjects 管理端学科列表（全部）
+func (h *MaterialHandler) AdminListSubjects(c *gin.Context) {
+	items, err := h.materialService.ListAllSubjects()
+	if err != nil {
+		response.InternalServerError(c, "failed to get subjects")
+		return
+	}
+	result := make([]*subjectResponse, 0, len(items))
+	for _, item := range items {
+		_, count, _ := h.materialService.GetSubjectByIDWithMaterialCount(item.ID)
+		result = append(result, toSubjectResponse(item, count))
+	}
+	response.Success(c, gin.H{"list": result})
+}
+
+type adminSubjectUpsertRequest struct {
+	Name        string `json:"name" binding:"required,max=100"`
+	Icon        string `json:"icon" binding:"max=50"`
+	Color       string `json:"color" binding:"max=20"`
+	Description string `json:"description" binding:"max=255"`
+	SortOrder   int    `json:"sort_order"`
+	IsActive    *bool  `json:"is_active"`
+}
+
+// AdminCreateSubject 创建学科
+func (h *MaterialHandler) AdminCreateSubject(c *gin.Context) {
+	var req adminSubjectUpsertRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+	isActive := true
+	if req.IsActive != nil {
+		isActive = *req.IsActive
+	}
+	item, err := h.materialService.CreateSubject(req.Name, req.Icon, req.Color, req.Description, req.SortOrder, isActive)
+	if err != nil {
+		response.InternalServerError(c, "failed to create subject")
+		return
+	}
+	response.Success(c, toSubjectResponse(item, 0))
+}
+
+// AdminUpdateSubject 更新学科
+func (h *MaterialHandler) AdminUpdateSubject(c *gin.Context) {
+	id := c.Param("id")
+	var req adminSubjectUpsertRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+	isActive := true
+	if req.IsActive != nil {
+		isActive = *req.IsActive
+	}
+	item, err := h.materialService.UpdateSubject(id, req.Name, req.Icon, req.Color, req.Description, req.SortOrder, isActive)
+	if err != nil {
+		response.InternalServerError(c, "failed to update subject")
+		return
+	}
+	_, count, _ := h.materialService.GetSubjectByIDWithMaterialCount(item.ID)
+	response.Success(c, toSubjectResponse(item, count))
+}
+
+// AdminDeleteSubject 删除学科
+func (h *MaterialHandler) AdminDeleteSubject(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.materialService.DeleteSubject(id); err != nil {
+		if err == service.ErrSubjectHasMaterials {
+			response.BadRequest(c, "学科下存在资料，无法删除")
+			return
+		}
+		response.InternalServerError(c, "failed to delete subject")
+		return
+	}
+	response.Success(c, gin.H{"success": true})
+}
+
+// =====================================================
+// 管理API - 资料相关
+// =====================================================
+
+// AdminListMaterials 管理端资料列表
+func (h *MaterialHandler) AdminListMaterials(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	subjectID := c.Query("subject_id")
+	fileType := c.Query("file_type")
+	status := c.Query("status")
+	keyword := c.Query("keyword")
+
+	params := repository.MaterialFileQueryParams{
+		SubjectID: subjectID,
+		FileType:  fileType,
+		Status:    status,
+		Keyword:   keyword,
+		Page:      page,
+		PageSize:  pageSize,
+		SortBy:    "created_at",
+		SortOrder: "DESC",
+	}
+
+	items, total, err := h.materialService.ListMaterials(params)
+	if err != nil {
+		response.InternalServerError(c, "failed to get materials")
+		return
+	}
+
+	result := make([]*materialResponse, 0, len(items))
+	for _, item := range items {
+		result = append(result, toMaterialResponse(item))
+	}
+
+	response.Success(c, gin.H{
+		"list":        result,
+		"total":       total,
+		"page":        page,
+		"page_size":   pageSize,
+		"total_pages": (total + int64(pageSize) - 1) / int64(pageSize),
+	})
+}
+
+type adminMaterialCreateRequest struct {
+	SubjectID   string   `json:"subject_id" binding:"required"`
+	Title       string   `json:"title" binding:"required,max=200"`
+	Description string   `json:"description"`
+	FileType    string   `json:"file_type" binding:"required,oneof=pdf word ppt"`
+	FileSize    int64    `json:"file_size"`
+	FileURL     string   `json:"file_url" binding:"required"`
+	FileName    string   `json:"file_name"`
+	Tags        []string `json:"tags"`
+}
+
+type adminMaterialUpdateRequest struct {
+	SubjectID   string   `json:"subject_id"`
+	Title       string   `json:"title" binding:"max=200"`
+	Description string   `json:"description"`
+	FileType    string   `json:"file_type" binding:"omitempty,oneof=pdf word ppt"`
+	FileSize    int64    `json:"file_size"`
+	FileURL     string   `json:"file_url"`
+	FileName    string   `json:"file_name"`
+	Tags        []string `json:"tags"`
+	Status      string   `json:"status" binding:"omitempty,oneof=active inactive"`
+}
+
+// AdminGetMaterial 管理端获取资料详情
+func (h *MaterialHandler) AdminGetMaterial(c *gin.Context) {
+	id := c.Param("id")
+	item, err := h.materialService.GetMaterialByIDWithSubject(id)
+	if err != nil {
+		response.NotFound(c, "material not found")
+		return
+	}
+	response.Success(c, toMaterialResponse(item))
+}
+
+// AdminCreateMaterial 创建资料
+func (h *MaterialHandler) AdminCreateMaterial(c *gin.Context) {
+	var req adminMaterialCreateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+
+	// 获取当前用户ID作为作者
+	userID, exists := c.Get("user_id")
+	var authorID string
+	if exists {
+		authorID = userID.(string)
+	}
+
+	file := &model.MaterialFile{
+		SubjectID:   req.SubjectID,
+		Title:       req.Title,
+		Description: req.Description,
+		FileType:    model.MaterialFileType(req.FileType),
+		FileSize:    req.FileSize,
+		FileURL:     req.FileURL,
+		FileName:    req.FileName,
+		Tags:        req.Tags,
+		Status:      model.MaterialStatusActive,
+		AuthorID:    authorID,
+	}
+
+	if err := h.materialService.CreateMaterial(file); err != nil {
+		response.InternalServerError(c, "failed to create material")
+		return
+	}
+	response.Success(c, toMaterialResponse(file))
+}
+
+// AdminUpdateMaterial 更新资料
+func (h *MaterialHandler) AdminUpdateMaterial(c *gin.Context) {
+	id := c.Param("id")
+	var req adminMaterialUpdateRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, err.Error())
+		return
+	}
+
+	file, err := h.materialService.GetMaterialByID(id)
+	if err != nil {
+		response.NotFound(c, "material not found")
+		return
+	}
+
+	// 更新字段
+	if req.SubjectID != "" {
+		file.SubjectID = req.SubjectID
+	}
+	if req.Title != "" {
+		file.Title = req.Title
+	}
+	if req.Description != "" {
+		file.Description = req.Description
+	}
+	if req.FileType != "" {
+		file.FileType = model.MaterialFileType(req.FileType)
+	}
+	if req.FileSize > 0 {
+		file.FileSize = req.FileSize
+	}
+	if req.FileURL != "" {
+		file.FileURL = req.FileURL
+	}
+	if req.FileName != "" {
+		file.FileName = req.FileName
+	}
+	if req.Tags != nil {
+		file.Tags = req.Tags
+	}
+	if req.Status != "" {
+		file.Status = model.MaterialStatus(req.Status)
+	}
+
+	if err := h.materialService.UpdateMaterial(file); err != nil {
+		response.InternalServerError(c, "failed to update material")
+		return
+	}
+	response.Success(c, toMaterialResponse(file))
+}
+
+// AdminDeleteMaterial 删除资料
+func (h *MaterialHandler) AdminDeleteMaterial(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.materialService.DeleteMaterial(id); err != nil {
+		response.InternalServerError(c, "failed to delete material")
+		return
+	}
+	response.Success(c, gin.H{"success": true})
+}

internal/model/init.go

@@ -159,6 +159,10 @@ func autoMigrate(db *gorm.DB) error {
 		&Role{},
 		&UserRole{},
 		&CasbinRule{},
+
+		// 学习资料相关
+		&MaterialSubject{},
+		&MaterialFile{},
 	)
 	if err != nil {
 		return err
@@ -184,6 +188,11 @@ func autoMigrate(db *gorm.DB) error {
 		return fmt.Errorf("failed to seed channels: %w", err)
 	}
 
+	// 初始化学习资料学科种子数据
+	if err := seedMaterialSubjects(db); err != nil {
+		return fmt.Errorf("failed to seed material subjects: %w", err)
+	}
+
 	return nil
 }
 
@@ -321,8 +330,18 @@ func seedPermissions(db *gorm.DB) error {
 	return nil
 }
 
-// seedChannels 初始化频道种子数据（按 slug 幂等）
+// seedChannels 初始化频道种子数据（仅在表为空时）
 func seedChannels(db *gorm.DB) error {
+	// 检查是否已有频道数据
+	var count int64
+	if err := db.Model(&Channel{}).Count(&count).Error; err != nil {
+		return err
+	}
+	if count > 0 {
+		zap.L().Info("Channels already exist, skipping seed", zap.Int64("count", count))
+		return nil
+	}
+
 	defaultChannels := []Channel{
 		{Name: "跳蚤市场", Slug: "market", Description: "二手交易与闲置发布", SortOrder: 10, IsActive: true},
 		{Name: "课程交流", Slug: "courses", Description: "课程资料、选课与学习讨论", SortOrder: 20, IsActive: true},
@@ -331,33 +350,45 @@ func seedChannels(db *gorm.DB) error {
 		{Name: "保研出国", Slug: "graduate-abroad", Description: "保研、留学申请与经验分享", SortOrder: 50, IsActive: true},
 	}
 
-	for _, item := range defaultChannels {
-		var existing Channel
-		err := db.Where("slug = ?", item.Slug).First(&existing).Error
-		if err == nil {
-			updates := map[string]any{
-				"name":        item.Name,
-				"description": item.Description,
-				"sort_order":  item.SortOrder,
-				"is_active":   item.IsActive,
-			}
-			if uerr := db.Model(&existing).Updates(updates).Error; uerr != nil {
-				return uerr
-			}
-			continue
-		}
-		if err != nil && err != gorm.ErrRecordNotFound {
-			return err
-		}
-		if cerr := db.Create(&item).Error; cerr != nil {
-			return cerr
-		}
+	if err := db.Create(&defaultChannels).Error; err != nil {
+		return err
 	}
 
 	zap.L().Info("Seeded channels successfully", zap.Int("count", len(defaultChannels)))
 	return nil
 }
 
+// seedMaterialSubjects 初始化学习资料学科种子数据（仅在表为空时）
+func seedMaterialSubjects(db *gorm.DB) error {
+	// 检查是否已有数据
+	var count int64
+	if err := db.Model(&MaterialSubject{}).Count(&count).Error; err != nil {
+		return err
+	}
+	if count > 0 {
+		zap.L().Info("Material subjects already exist, skipping seed", zap.Int64("count", count))
+		return nil
+	}
+
+	defaultSubjects := []MaterialSubject{
+		{Name: "数学", Icon: "calculator-variant", Color: "#FF6B6B", Description: "高等数学、线性代数、概率论等", SortOrder: 10, IsActive: true},
+		{Name: "英语", Icon: "translate", Color: "#4ECDC4", Description: "四六级、考研英语、托福雅思等", SortOrder: 20, IsActive: true},
+		{Name: "物理", Icon: "atom", Color: "#45B7D1", Description: "大学物理、电磁学、力学等", SortOrder: 30, IsActive: true},
+		{Name: "化学", Icon: "flask", Color: "#96CEB4", Description: "有机化学、无机化学、分析化学等", SortOrder: 40, IsActive: true},
+		{Name: "计算机", Icon: "laptop", Color: "#FFEAA7", Description: "数据结构、算法、操作系统等", SortOrder: 50, IsActive: true},
+		{Name: "经济管理", Icon: "chart-line", Color: "#DDA0DD", Description: "微观经济学、宏观经济学、管理学等", SortOrder: 60, IsActive: true},
+		{Name: "法学", Icon: "scale-balance", Color: "#F39C12", Description: "民法、刑法、宪法等", SortOrder: 70, IsActive: true},
+		{Name: "语文文学", Icon: "book-open-page-variant", Color: "#3498DB", Description: "古代文学、现代文学、写作等", SortOrder: 80, IsActive: true},
+	}
+
+	if err := db.Create(&defaultSubjects).Error; err != nil {
+		return err
+	}
+
+	zap.L().Info("Seeded material subjects successfully", zap.Int("count", len(defaultSubjects)))
+	return nil
+}
+
 // CloseDB 关闭数据库连接
 func CloseDB(db *gorm.DB) {
 	if sqlDB, err := db.DB(); err == nil {

internal/model/material.go

@@ -0,0 +1,113 @@
+package model
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// MaterialFileType 文件类型
+type MaterialFileType string
+
+const (
+	MaterialFileTypePDF  MaterialFileType = "pdf"
+	MaterialFileTypeWord MaterialFileType = "word"
+	MaterialFileTypePPT  MaterialFileType = "ppt"
+)
+
+// MaterialStatus 资料状态
+type MaterialStatus string
+
+const (
+	MaterialStatusActive   MaterialStatus = "active"
+	MaterialStatusInactive MaterialStatus = "inactive"
+)
+
+// MaterialSubject 学科分类
+type MaterialSubject struct {
+	ID          string    `json:"id" gorm:"type:varchar(36);primaryKey"`
+	Name        string    `json:"name" gorm:"type:varchar(100);not null"`
+	Icon        string    `json:"icon" gorm:"type:varchar(50)"`         // MaterialCommunityIcons name
+	Color       string    `json:"color" gorm:"type:varchar(20)"`        // 主题色
+	Description string    `json:"description" gorm:"type:varchar(255)"` // 描述
+	SortOrder   int       `json:"sort_order" gorm:"default:0;index"`    // 排序权重
+	IsActive    bool      `json:"is_active" gorm:"default:true;index"`  // 是否启用
+	CreatedAt   time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt   time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+
+	// 关联
+	Materials []MaterialFile `json:"materials,omitempty" gorm:"foreignKey:SubjectID"`
+}
+
+// BeforeCreate 创建前生成UUID
+func (s *MaterialSubject) BeforeCreate(tx *gorm.DB) error {
+	if s.ID == "" {
+		s.ID = uuid.New().String()
+	}
+	return nil
+}
+
+func (MaterialSubject) TableName() string {
+	return "material_subjects"
+}
+
+// StringArray 字符串数组类型（用于tags）
+type StringArray []string
+
+// Value 实现 driver.Valuer 接口
+func (a StringArray) Value() (driver.Value, error) {
+	if a == nil {
+		return nil, nil
+	}
+	return json.Marshal(a)
+}
+
+// Scan 实现 sql.Scanner 接口
+func (a *StringArray) Scan(value interface{}) error {
+	if value == nil {
+		*a = nil
+		return nil
+	}
+	bytes, ok := value.([]byte)
+	if !ok {
+		return nil
+	}
+	return json.Unmarshal(bytes, a)
+}
+
+// MaterialFile 文件资料
+type MaterialFile struct {
+	ID            string          `json:"id" gorm:"type:varchar(36);primaryKey"`
+	SubjectID     string          `json:"subject_id" gorm:"type:varchar(36);index;not null"`
+	Title         string          `json:"title" gorm:"type:varchar(200);not null"`
+	Description   string          `json:"description" gorm:"type:text"`
+	FileType      MaterialFileType `json:"file_type" gorm:"type:varchar(20);not null;index"`
+	FileSize      int64           `json:"file_size" gorm:"default:0"`           // 文件大小(字节)
+	FileURL       string          `json:"file_url" gorm:"type:text;not null"`   // 文件URL
+	FileName      string          `json:"file_name" gorm:"type:varchar(255)"`   // 原始文件名
+	DownloadCount int             `json:"download_count" gorm:"default:0"`      // 下载次数
+	AuthorID      string          `json:"author_id" gorm:"type:varchar(36);index"` // 上传者ID
+	Tags          StringArray     `json:"tags" gorm:"type:json"`                  // 标签
+	Status        MaterialStatus  `json:"status" gorm:"type:varchar(20);default:active;index"` // 状态
+	CreatedAt     time.Time       `json:"created_at" gorm:"autoCreateTime;index"`
+	UpdatedAt     time.Time       `json:"updated_at" gorm:"autoUpdateTime"`
+
+	// 关联
+	Subject *MaterialSubject `json:"subject,omitempty" gorm:"foreignKey:SubjectID"`
+	Author  *User            `json:"author,omitempty" gorm:"foreignKey:AuthorID"`
+}
+
+// BeforeCreate 创建前生成UUID
+func (f *MaterialFile) BeforeCreate(tx *gorm.DB) error {
+	if f.ID == "" {
+		f.ID = uuid.New().String()
+	}
+	return nil
+}
+
+func (MaterialFile) TableName() string {
+	return "material_files"
+}

internal/repository/material_repo.go

@@ -0,0 +1,247 @@
+package repository
+
+import (
+	"carrot_bbs/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// MaterialSubjectRepository 学科分类仓储
+type MaterialSubjectRepository struct {
+	db *gorm.DB
+}
+
+func NewMaterialSubjectRepository(db *gorm.DB) *MaterialSubjectRepository {
+	return &MaterialSubjectRepository{db: db}
+}
+
+// ListActive 获取所有启用的学科分类
+func (r *MaterialSubjectRepository) ListActive() ([]*model.MaterialSubject, error) {
+	var subjects []*model.MaterialSubject
+	err := r.db.
+		Where("is_active = ?", true).
+		Order("sort_order ASC, created_at ASC").
+		Find(&subjects).Error
+	return subjects, err
+}
+
+// ListAll 获取所有学科分类（管理端用）
+func (r *MaterialSubjectRepository) ListAll() ([]*model.MaterialSubject, error) {
+	var subjects []*model.MaterialSubject
+	err := r.db.
+		Order("sort_order ASC, created_at ASC").
+		Find(&subjects).Error
+	return subjects, err
+}
+
+// GetByID 根据ID获取学科分类
+func (r *MaterialSubjectRepository) GetByID(id string) (*model.MaterialSubject, error) {
+	var subject model.MaterialSubject
+	if err := r.db.First(&subject, "id = ?", id).Error; err != nil {
+		return nil, err
+	}
+	return &subject, nil
+}
+
+// Create 创建学科分类
+func (r *MaterialSubjectRepository) Create(subject *model.MaterialSubject) error {
+	return r.db.Create(subject).Error
+}
+
+// Update 更新学科分类
+func (r *MaterialSubjectRepository) Update(subject *model.MaterialSubject) error {
+	return r.db.Save(subject).Error
+}
+
+// Delete 删除学科分类
+func (r *MaterialSubjectRepository) Delete(id string) error {
+	return r.db.Delete(&model.MaterialSubject{}, "id = ?", id).Error
+}
+
+// CountMaterials 统计学科下的资料数量
+func (r *MaterialSubjectRepository) CountMaterials(subjectID string) (int64, error) {
+	var count int64
+	err := r.db.Model(&model.MaterialFile{}).Where("subject_id = ?", subjectID).Count(&count).Error
+	return count, err
+}
+
+// MaterialFileRepository 文件资料仓储
+type MaterialFileRepository struct {
+	db *gorm.DB
+}
+
+func NewMaterialFileRepository(db *gorm.DB) *MaterialFileRepository {
+	return &MaterialFileRepository{db: db}
+}
+
+// ListQueryParams 查询参数
+type MaterialFileQueryParams struct {
+	SubjectID string
+	FileType  string
+	Status    string
+	Keyword   string
+	Page      int
+	PageSize  int
+	SortBy    string
+	SortOrder string
+}
+
+// List 获取资料列表（支持筛选和分页）
+func (r *MaterialFileRepository) List(params MaterialFileQueryParams) ([]*model.MaterialFile, int64, error) {
+	var files []*model.MaterialFile
+	var total int64
+
+	query := r.db.Model(&model.MaterialFile{})
+
+	// 筛选条件
+	if params.SubjectID != "" {
+		query = query.Where("subject_id = ?", params.SubjectID)
+	}
+	if params.FileType != "" {
+		query = query.Where("file_type = ?", params.FileType)
+	}
+	if params.Status != "" {
+		query = query.Where("status = ?", params.Status)
+	}
+	if params.Keyword != "" {
+		keyword := "%" + params.Keyword + "%"
+		query = query.Where("title LIKE ? OR description LIKE ?", keyword, keyword)
+	}
+
+	// 统计总数
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	// 排序
+	sortBy := params.SortBy
+	if sortBy == "" {
+		sortBy = "created_at"
+	}
+	sortOrder := params.SortOrder
+	if sortOrder == "" {
+		sortOrder = "DESC"
+	}
+	orderClause := sortBy + " " + sortOrder
+
+	// 分页
+	page := params.Page
+	if page < 1 {
+		page = 1
+	}
+	pageSize := params.PageSize
+	if pageSize < 1 {
+		pageSize = 20
+	}
+	offset := (page - 1) * pageSize
+
+	// 查询
+	if err := query.Order(orderClause).Offset(offset).Limit(pageSize).Find(&files).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return files, total, nil
+}
+
+// GetByID 根据ID获取资料详情
+func (r *MaterialFileRepository) GetByID(id string) (*model.MaterialFile, error) {
+	var file model.MaterialFile
+	if err := r.db.First(&file, "id = ?", id).Error; err != nil {
+		return nil, err
+	}
+	return &file, nil
+}
+
+// GetByIDWithSubject 根据ID获取资料详情（包含学科信息）
+func (r *MaterialFileRepository) GetByIDWithSubject(id string) (*model.MaterialFile, error) {
+	var file model.MaterialFile
+	if err := r.db.Preload("Subject").First(&file, "id = ?", id).Error; err != nil {
+		return nil, err
+	}
+	return &file, nil
+}
+
+// Create 创建资料
+func (r *MaterialFileRepository) Create(file *model.MaterialFile) error {
+	return r.db.Create(file).Error
+}
+
+// Update 更新资料
+func (r *MaterialFileRepository) Update(file *model.MaterialFile) error {
+	return r.db.Save(file).Error
+}
+
+// Delete 删除资料
+func (r *MaterialFileRepository) Delete(id string) error {
+	return r.db.Delete(&model.MaterialFile{}, "id = ?", id).Error
+}
+
+// IncrementDownloadCount 增加下载次数
+func (r *MaterialFileRepository) IncrementDownloadCount(id string) error {
+	return r.db.Model(&model.MaterialFile{}).Where("id = ?", id).
+		UpdateColumn("download_count", gorm.Expr("download_count + ?", 1)).Error
+}
+
+// GetBySubjectID 根据学科ID获取资料列表
+func (r *MaterialFileRepository) GetBySubjectID(subjectID string, page, pageSize int) ([]*model.MaterialFile, int64, error) {
+	var files []*model.MaterialFile
+	var total int64
+
+	query := r.db.Model(&model.MaterialFile{}).Where("subject_id = ? AND status = ?", subjectID, model.MaterialStatusActive)
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	offset := (page - 1) * pageSize
+	if err := query.Order("created_at DESC").Offset(offset).Limit(pageSize).Find(&files).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return files, total, nil
+}
+
+// Search 搜索资料
+func (r *MaterialFileRepository) Search(keyword string, page, pageSize int) ([]*model.MaterialFile, int64, error) {
+	var files []*model.MaterialFile
+	var total int64
+
+	query := r.db.Model(&model.MaterialFile{}).Where("status = ?", model.MaterialStatusActive)
+	if keyword != "" {
+		kw := "%" + keyword + "%"
+		query = query.Where("title LIKE ? OR description LIKE ?", kw, kw)
+	}
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	offset := (page - 1) * pageSize
+	if err := query.Order("created_at DESC").Offset(offset).Limit(pageSize).Find(&files).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return files, total, nil
+}
+
+// GetHotMaterials 获取热门资料（按下载次数排序）
+func (r *MaterialFileRepository) GetHotMaterials(limit int) ([]*model.MaterialFile, error) {
+	var files []*model.MaterialFile
+	err := r.db.
+		Where("status = ?", model.MaterialStatusActive).
+		Order("download_count DESC").
+		Limit(limit).
+		Find(&files).Error
+	return files, err
+}
+
+// GetLatestMaterials 获取最新资料
+func (r *MaterialFileRepository) GetLatestMaterials(limit int) ([]*model.MaterialFile, error) {
+	var files []*model.MaterialFile
+	err := r.db.
+		Where("status = ?", model.MaterialStatusActive).
+		Order("created_at DESC").
+		Limit(limit).
+		Find(&files).Error
+	return files, err
+}

internal/router/router.go

@@ -33,6 +33,7 @@ type Router struct {
 	adminDashboardHandler *handler.AdminDashboardHandler
 	adminLogHandler       *handler.AdminLogHandler
 	qrcodeHandler         *handler.QRCodeHandler
+	materialHandler       *handler.MaterialHandler
 	logService            *service.LogService
 	jwtService            *service.JWTService
 	casbinService         service.CasbinService
@@ -62,6 +63,7 @@ func New(
 	adminDashboardHandler *handler.AdminDashboardHandler,
 	adminLogHandler *handler.AdminLogHandler,
 	qrcodeHandler *handler.QRCodeHandler,
+	materialHandler *handler.MaterialHandler,
 	logService *service.LogService,
 	activityService service.UserActivityService,
 	casbinService service.CasbinService,
@@ -94,6 +96,7 @@ func New(
 		adminDashboardHandler: adminDashboardHandler,
 		adminLogHandler:       adminLogHandler,
 		qrcodeHandler:         qrcodeHandler,
+		materialHandler:       materialHandler,
 		logService:            logService,
 		jwtService:            jwtService,
 		casbinService:         casbinService,
@@ -262,6 +265,21 @@ func (r *Router) setupRoutes() {
 			}
 		}
 
+		// 学习资料路由（公开）
+		if r.materialHandler != nil {
+			materials := v1.Group("/materials")
+			{
+				// 学科相关
+				materials.GET("/subjects", r.materialHandler.ListSubjects)
+				materials.GET("/subjects/:id", r.materialHandler.GetSubject)
+				// 资料相关
+				materials.GET("", r.materialHandler.ListMaterials)
+				materials.GET("/search", r.materialHandler.SearchMaterials)
+				materials.GET("/:id", r.materialHandler.GetMaterial)
+				materials.GET("/:id/download", r.materialHandler.DownloadMaterial)
+			}
+		}
+
 		// 投票选项路由
 		voteOptions := v1.Group("/vote-options")
 		voteOptions.Use(authMiddleware)
@@ -508,6 +526,21 @@ func (r *Router) setupRoutes() {
 						logs.GET("/export", r.adminLogHandler.ExportLogs)
 					}
 				}
+
+				// 学习资料管理
+				if r.materialHandler != nil {
+					// 学科管理
+					admin.GET("/materials/subjects", r.materialHandler.AdminListSubjects)
+					admin.POST("/materials/subjects", r.materialHandler.AdminCreateSubject)
+					admin.PUT("/materials/subjects/:id", r.materialHandler.AdminUpdateSubject)
+					admin.DELETE("/materials/subjects/:id", r.materialHandler.AdminDeleteSubject)
+					// 资料管理
+					admin.GET("/materials", r.materialHandler.AdminListMaterials)
+					admin.GET("/materials/:id", r.materialHandler.AdminGetMaterial)
+					admin.POST("/materials", r.materialHandler.AdminCreateMaterial)
+					admin.PUT("/materials/:id", r.materialHandler.AdminUpdateMaterial)
+					admin.DELETE("/materials/:id", r.materialHandler.AdminDeleteMaterial)
+				}
 			}
 		}
 	}

internal/service/material_service.go

@@ -0,0 +1,172 @@
+package service
+
+import (
+	"errors"
+	"carrot_bbs/internal/model"
+	"carrot_bbs/internal/repository"
+)
+
+// ErrSubjectHasMaterials 学科下存在资料，无法删除
+var ErrSubjectHasMaterials = errors.New("学科下存在资料，无法删除")
+
+// MaterialService 学习资料服务接口
+type MaterialService interface {
+	// 学科相关
+	ListActiveSubjects() ([]*model.MaterialSubject, error)
+	ListAllSubjects() ([]*model.MaterialSubject, error)
+	GetSubjectByID(id string) (*model.MaterialSubject, error)
+	GetSubjectByIDWithMaterialCount(id string) (*model.MaterialSubject, int64, error)
+	CreateSubject(name, icon, color, description string, sortOrder int, isActive bool) (*model.MaterialSubject, error)
+	UpdateSubject(id, name, icon, color, description string, sortOrder int, isActive bool) (*model.MaterialSubject, error)
+	DeleteSubject(id string) error
+
+	// 资料相关
+	ListMaterials(params repository.MaterialFileQueryParams) ([]*model.MaterialFile, int64, error)
+	GetMaterialByID(id string) (*model.MaterialFile, error)
+	GetMaterialByIDWithSubject(id string) (*model.MaterialFile, error)
+	GetMaterialsBySubject(subjectID string, page, pageSize int) ([]*model.MaterialFile, int64, error)
+	SearchMaterials(keyword string, page, pageSize int) ([]*model.MaterialFile, int64, error)
+	GetHotMaterials(limit int) ([]*model.MaterialFile, error)
+	GetLatestMaterials(limit int) ([]*model.MaterialFile, error)
+	CreateMaterial(file *model.MaterialFile) error
+	UpdateMaterial(file *model.MaterialFile) error
+	DeleteMaterial(id string) error
+	IncrementDownloadCount(id string) error
+}
+
+// materialServiceImpl 学习资料服务实现
+type materialServiceImpl struct {
+	subjectRepo *repository.MaterialSubjectRepository
+	fileRepo    *repository.MaterialFileRepository
+}
+
+// NewMaterialService 创建学习资料服务
+func NewMaterialService(
+	subjectRepo *repository.MaterialSubjectRepository,
+	fileRepo *repository.MaterialFileRepository,
+) MaterialService {
+	return &materialServiceImpl{
+		subjectRepo: subjectRepo,
+		fileRepo:    fileRepo,
+	}
+}
+
+// =====================================================
+// 学科相关方法
+// =====================================================
+
+func (s *materialServiceImpl) ListActiveSubjects() ([]*model.MaterialSubject, error) {
+	return s.subjectRepo.ListActive()
+}
+
+func (s *materialServiceImpl) ListAllSubjects() ([]*model.MaterialSubject, error) {
+	return s.subjectRepo.ListAll()
+}
+
+func (s *materialServiceImpl) GetSubjectByID(id string) (*model.MaterialSubject, error) {
+	return s.subjectRepo.GetByID(id)
+}
+
+func (s *materialServiceImpl) GetSubjectByIDWithMaterialCount(id string) (*model.MaterialSubject, int64, error) {
+	subject, err := s.subjectRepo.GetByID(id)
+	if err != nil {
+		return nil, 0, err
+	}
+	count, err := s.subjectRepo.CountMaterials(id)
+	if err != nil {
+		return subject, 0, nil
+	}
+	return subject, count, nil
+}
+
+func (s *materialServiceImpl) CreateSubject(name, icon, color, description string, sortOrder int, isActive bool) (*model.MaterialSubject, error) {
+	subject := &model.MaterialSubject{
+		Name:        name,
+		Icon:        icon,
+		Color:       color,
+		Description: description,
+		SortOrder:   sortOrder,
+		IsActive:    isActive,
+	}
+	if err := s.subjectRepo.Create(subject); err != nil {
+		return nil, err
+	}
+	return subject, nil
+}
+
+func (s *materialServiceImpl) UpdateSubject(id, name, icon, color, description string, sortOrder int, isActive bool) (*model.MaterialSubject, error) {
+	subject, err := s.subjectRepo.GetByID(id)
+	if err != nil {
+		return nil, err
+	}
+	subject.Name = name
+	subject.Icon = icon
+	subject.Color = color
+	subject.Description = description
+	subject.SortOrder = sortOrder
+	subject.IsActive = isActive
+	if err := s.subjectRepo.Update(subject); err != nil {
+		return nil, err
+	}
+	return subject, nil
+}
+
+func (s *materialServiceImpl) DeleteSubject(id string) error {
+	// 检查学科下是否有资料
+	count, err := s.subjectRepo.CountMaterials(id)
+	if err != nil {
+		return err
+	}
+	if count > 0 {
+		return ErrSubjectHasMaterials
+	}
+	return s.subjectRepo.Delete(id)
+}
+
+// =====================================================
+// 资料相关方法
+// =====================================================
+
+func (s *materialServiceImpl) ListMaterials(params repository.MaterialFileQueryParams) ([]*model.MaterialFile, int64, error) {
+	return s.fileRepo.List(params)
+}
+
+func (s *materialServiceImpl) GetMaterialByID(id string) (*model.MaterialFile, error) {
+	return s.fileRepo.GetByID(id)
+}
+
+func (s *materialServiceImpl) GetMaterialByIDWithSubject(id string) (*model.MaterialFile, error) {
+	return s.fileRepo.GetByIDWithSubject(id)
+}
+
+func (s *materialServiceImpl) GetMaterialsBySubject(subjectID string, page, pageSize int) ([]*model.MaterialFile, int64, error) {
+	return s.fileRepo.GetBySubjectID(subjectID, page, pageSize)
+}
+
+func (s *materialServiceImpl) SearchMaterials(keyword string, page, pageSize int) ([]*model.MaterialFile, int64, error) {
+	return s.fileRepo.Search(keyword, page, pageSize)
+}
+
+func (s *materialServiceImpl) GetHotMaterials(limit int) ([]*model.MaterialFile, error) {
+	return s.fileRepo.GetHotMaterials(limit)
+}
+
+func (s *materialServiceImpl) GetLatestMaterials(limit int) ([]*model.MaterialFile, error) {
+	return s.fileRepo.GetLatestMaterials(limit)
+}
+
+func (s *materialServiceImpl) CreateMaterial(file *model.MaterialFile) error {
+	return s.fileRepo.Create(file)
+}
+
+func (s *materialServiceImpl) UpdateMaterial(file *model.MaterialFile) error {
+	return s.fileRepo.Update(file)
+}
+
+func (s *materialServiceImpl) DeleteMaterial(id string) error {
+	return s.fileRepo.Delete(id)
+}
+
+func (s *materialServiceImpl) IncrementDownloadCount(id string) error {
+	return s.fileRepo.IncrementDownloadCount(id)
+}

internal/wire/handler.go

@@ -28,6 +28,7 @@ var HandlerSet = wire.NewSet(
 	handler.NewAdminDashboardHandler,
 	handler.NewAdminLogHandler,
 	handler.NewQRCodeHandler,
+	handler.NewMaterialHandler,
 
 	// 需要特殊处理的 Handler
 	ProvideUserHandler,

internal/wire/repository.go

@@ -23,6 +23,8 @@ var RepositorySet = wire.NewSet(
 	repository.NewVoteRepository,
 	repository.NewChannelRepository,
 	repository.NewScheduleRepository,
+	repository.NewMaterialSubjectRepository,
+	repository.NewMaterialFileRepository,
 	ProvideUserActivityRepository,
 
 	// 日志相关仓储

internal/wire/service.go

@@ -54,6 +54,7 @@ var ServiceSet = wire.NewSet(
 	ProvideAdminDashboardService,
 	ProvideQRCodeLoginService,
 	ProvideHotRankWorker,
+	ProvideMaterialService,
 
 	// 日志服务
 	ProvideAsyncLogManager,
@@ -369,6 +370,14 @@ func ProvideQRCodeLoginService(
 	return service.NewQRCodeLoginService(redisClient, sseHub, jwtService, userService, activityService, logService)
 }
 
+// ProvideMaterialService 提供学习资料服务
+func ProvideMaterialService(
+	subjectRepo *repository.MaterialSubjectRepository,
+	fileRepo *repository.MaterialFileRepository,
+) service.MaterialService {
+	return service.NewMaterialService(subjectRepo, fileRepo)
+}
+
 // parseDuration 解析时长字符串
 func parseDuration(s string) (time.Duration, error) {
 	return time.ParseDuration(s)