如何在gorm中处理多个关系？

type User struct {
    gorm.Model
    Name     string
    Profile  Profile `gorm:"foreignKey:UserID"`
    Posts    []Post  `gorm:"foreignKey:UserID"`
    Likes    []Post `gorm:"many2many:user_likes;"`
}

type Profile struct {
    gorm.Model
    UserID uint
    Bio    string
}

type Post struct {
    gorm.Model
    Title  string
    UserID uint
}

package main

import (
    "fmt"
    "gorm.io/driver/sqlite"
    "gorm.io/gorm"
)

func main() {
    db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
    if err != nil {
        panic("failed to connect database")
    }

    // 自动迁移模式
    db.AutoMigrate(&User{}, &Profile{}, &Post{})

    // 创建一个用户及其关联的个人资料和帖子
    user := User{
        Name: "John Doe",
        Profile: Profile{
            Bio: "A software developer",
        },
        Posts: []Post{
            {Title: "First Post"},
            {Title: "Second Post"},
        },
    }
    db.Create(&user)

    // 预加载关联数据
    var result User
    db.Preload("Profile").Preload("Posts").Find(&result, user.ID)
    fmt.Println(result)

    // 预加载多对多关系
    db.Preload("Likes").Find(&result, user.ID)
    fmt.Println(result.Likes)
}