如何使用GORM将带有外键约束的结构初始化并插入到数据库中

type User struct {
    ID    int
    Name  string
    Email string
}

type Order struct {
    ID     int
    UserID int
    Amount float64
}

import (
    "gorm.io/gorm"
    "gorm.io/driver/mysql"
)

func main() {
    dsn := "user:password@tcp(host:port)/database?charset=utf8mb4&parseTime=True&loc=Local"
    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
    if err != nil {
        panic("Failed to connect to database")
    }
    
    // ...
}

func main() {
    // ...
    
    db.AutoMigrate(&User{}, &Order{})
    
    // ...
}

func main() {
    // ...
    
    user := User{
        Name:  "John Doe",
        Email: "johndoe@example.com",
    }
    
    order := Order{
        UserID: user.ID,
        Amount: 100.0,
    }
    
    // ...
}

func main() {
    // ...
    
    db.Create(&user)
    db.Create(&order)
    
    // ...
}