如何使用Go語言編寫上門做菜系統中的使用者收藏夾管理模組？

package main

import (
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
)

var db *gorm.DB

func init() {
    // 创建数据库连接
    var err error
    db, err = gorm.Open("mysql", "username:password@tcp(localhost:3306)/database?charset=utf8mb4&parseTime=True&loc=Local")
    if err != nil {
        panic(err)
    }

    // 创建相关表
    db.AutoMigrate(&User{}, &Favorite{})
}

func main() {
    defer db.Close()

    // 进行其他操作
}

type User struct {
    ID        uint   `gorm:"primary_key"`
    Username  string `gorm:"unique"`
    Password  string
    CreatedAt time.Time
    UpdatedAt time.Time
}

type Favorite struct {
    ID        uint   `gorm:"primary_key"`
    UserID    uint
    DishID    uint
    CreatedAt time.Time
    UpdatedAt time.Time

    User    User
    Dish    Dish
}

// 添加收藏夹
func AddFavorite(userID uint, dishID uint) error {
    favorite := Favorite{
        UserID:    userID,
        DishID:    dishID,
        CreatedAt: time.Now(),
        UpdatedAt: time.Now(),
    }

    err := db.Create(&favorite).Error
    if err != nil {
        return err
    }

    return nil
}

// 删除收藏夹
func DeleteFavorite(userID uint, dishID uint) error {
    err := db.Where("user_id = ? AND dish_id = ?", userID, dishID).Delete(&Favorite{}).Error
    if err != nil {
        return err
    }

    return nil
}

// 获取用户收藏夹列表
func GetFavoriteList(userID uint) ([]Favorite, error) {
    var favorites []Favorite
    err := db.Where("user_id = ?", userID).Find(&favorites).Error
    if err != nil {
        return nil, err
    }

    return favorites, nil
}