Go를 사용하여 Google App Engine Datastore에서 중첩 구조체를 효과적으로 구현하려면 어떻게 해야 합니까?

<code class="go">type Post struct {
    Field1 string
    Field2 string
    User   User // Nested user struct
}

type User struct {
    UserField1 string
    UserField2 string
}</code>

<code class="go">// Implement PropertyLoadSaver interface to serialize/deserialize nested struct
func (u *User) Load(props []datastore.Property) error {
    for _, prop := range props {
        switch prop.Name {
        case "UserField1":
            u.UserField1 = prop.Value.(string)
        case "UserField2":
            u.UserField2 = prop.Value.(string)
        }
    }
    return nil
}

func (u *User) Save() ([]datastore.Property, error) {
    props := []datastore.Property{
        datastore.StringProperty("UserField1", u.UserField1),
        datastore.StringProperty("UserField2", u.UserField2),
    }
    return props, nil
}</code>

<code class="go">// Fetch the post and its embedded user information
key := datastore.NameKey("Post", "my-post", nil)
post := &Post{}
if err := datastore.Get(ctx, key, post); err != nil {
    // Handle error
}

// JSON Marshal the post with its embedded user information
jsonPost, err := json.Marshal(post)
if err != nil {
    // Handle error
}</code>