如何在GORM中以列表的形式实现一对多映射

type User struct {
    ID    uint
    Name  string
    Posts []Post // 一对多关系，一个用户可以拥有多个帖子
}

type Post struct {
    ID      uint
    Title   string
    Content string
    UserID  uint // 外键，指向User模型的ID字段
}

type Post struct {
    ID      uint
    Title   string
    Content string
    UserID  uint `gorm:"foreignKey:UserID"` // 外键，指向User模型的ID字段
}

var user User
db.Preload("Posts").First(&user, userID)

user := User{
    Name: "John",
    Posts: []Post{
        {Title: "Post 1", Content: "Content 1"},
        {Title: "Post 2", Content: "Content 2"},
    },
}
db.Create(&user)