golang gorm在保存时更新关联

// 导入必要的包
import (
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
)

// 定义模型结构
type User struct {
    gorm.Model
    Name     string
    Email    string
    Profile  Profile
}

type Profile struct {
    gorm.Model
    UserID   uint
    Age      int
    Address  string
}

// 创建数据库连接
db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True&loc=Local")
if err != nil {
    panic("failed to connect database")
}
defer db.Close()

// 自动迁移模型结构
db.AutoMigrate(&User{}, &Profile{})

// 创建一个新的用户
user := User{Name: "John", Email: "john@example.com", Profile: Profile{Age: 25, Address: "123 Street"}}
db.Create(&user)

// 更新用户的关联关系
user.Profile.Age = 30
user.Profile.Address = "456 Street"
db.Model(&user).Update("Profile", user.Profile)