feat: 添加种子数据初始化功能，重构多个处理程序以简化错误响应和用户验证

internal/repository/user_repository.go

@@ -2,7 +2,6 @@ package repository
 
 import (
 	"carrotskin/internal/model"
-	"carrotskin/pkg/database"
 	"errors"
 
 	"gorm.io/gorm"
@@ -10,87 +9,58 @@ import (
 
 // CreateUser 创建用户
 func CreateUser(user *model.User) error {
-	db := database.MustGetDB()
-	return db.Create(user).Error
+	return getDB().Create(user).Error
 }
 
 // FindUserByID 根据ID查找用户
 func FindUserByID(id int64) (*model.User, error) {
-	db := database.MustGetDB()
 	var user model.User
-	err := db.Where("id = ? AND status != -1", id).First(&user).Error
-	if err != nil {
-		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return nil, nil
-		}
-		return nil, err
-	}
-	return &user, nil
+	err := getDB().Where("id = ? AND status != -1", id).First(&user).Error
+	return HandleNotFound(&user, err)
 }
 
 // FindUserByUsername 根据用户名查找用户
 func FindUserByUsername(username string) (*model.User, error) {
-	db := database.MustGetDB()
 	var user model.User
-	err := db.Where("username = ? AND status != -1", username).First(&user).Error
-	if err != nil {
-		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return nil, nil
-		}
-		return nil, err
-	}
-	return &user, nil
+	err := getDB().Where("username = ? AND status != -1", username).First(&user).Error
+	return HandleNotFound(&user, err)
 }
 
 // FindUserByEmail 根据邮箱查找用户
 func FindUserByEmail(email string) (*model.User, error) {
-	db := database.MustGetDB()
 	var user model.User
-	err := db.Where("email = ? AND status != -1", email).First(&user).Error
-	if err != nil {
-		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return nil, nil
-		}
-		return nil, err
-	}
-	return &user, nil
+	err := getDB().Where("email = ? AND status != -1", email).First(&user).Error
+	return HandleNotFound(&user, err)
 }
 
 // UpdateUser 更新用户
 func UpdateUser(user *model.User) error {
-	db := database.MustGetDB()
-	return db.Save(user).Error
+	return getDB().Save(user).Error
 }
 
 // UpdateUserFields 更新指定字段
 func UpdateUserFields(id int64, fields map[string]interface{}) error {
-	db := database.MustGetDB()
-	return db.Model(&model.User{}).Where("id = ?", id).Updates(fields).Error
+	return getDB().Model(&model.User{}).Where("id = ?", id).Updates(fields).Error
 }
 
 // DeleteUser 软删除用户
 func DeleteUser(id int64) error {
-	db := database.MustGetDB()
-	return db.Model(&model.User{}).Where("id = ?", id).Update("status", -1).Error
+	return getDB().Model(&model.User{}).Where("id = ?", id).Update("status", -1).Error
 }
 
 // CreateLoginLog 创建登录日志
 func CreateLoginLog(log *model.UserLoginLog) error {
-	db := database.MustGetDB()
-	return db.Create(log).Error
+	return getDB().Create(log).Error
 }
 
 // CreatePointLog 创建积分日志
 func CreatePointLog(log *model.UserPointLog) error {
-	db := database.MustGetDB()
-	return db.Create(log).Error
+	return getDB().Create(log).Error
 }
 
 // UpdateUserPoints 更新用户积分（事务）
 func UpdateUserPoints(userID int64, amount int, changeType, reason string) error {
-	db := database.MustGetDB()
-	return db.Transaction(func(tx *gorm.DB) error {
-		// 获取当前用户积分
+	return getDB().Transaction(func(tx *gorm.DB) error {
 		var user model.User
 		if err := tx.Where("id = ?", userID).First(&user).Error; err != nil {
 			return err
@@ -99,17 +69,14 @@ func UpdateUserPoints(userID int64, amount int, changeType, reason string) error
 		balanceBefore := user.Points
 		balanceAfter := balanceBefore + amount
 
-		// 检查积分是否足够
 		if balanceAfter < 0 {
 			return errors.New("积分不足")
 		}
 
-		// 更新用户积分
 		if err := tx.Model(&user).Update("points", balanceAfter).Error; err != nil {
 			return err
 		}
 
-		// 创建积分日志
 		log := &model.UserPointLog{
 			UserID:        userID,
 			ChangeType:    changeType,
@@ -125,12 +92,10 @@ func UpdateUserPoints(userID int64, amount int, changeType, reason string) error
 
 // UpdateUserAvatar 更新用户头像
 func UpdateUserAvatar(userID int64, avatarURL string) error {
-	db := database.MustGetDB()
-	return db.Model(&model.User{}).Where("id = ?", userID).Update("avatar", avatarURL).Error
+	return getDB().Model(&model.User{}).Where("id = ?", userID).Update("avatar", avatarURL).Error
 }
 
 // UpdateUserEmail 更新用户邮箱
 func UpdateUserEmail(userID int64, email string) error {
-	db := database.MustGetDB()
-	return db.Model(&model.User{}).Where("id = ?", userID).Update("email", email).Error
+	return getDB().Model(&model.User{}).Where("id = ?", userID).Update("email", email).Error
 }