Gorm How to save nest model and nest array and what is best practice

Your Question

I have model like

type Rect struct {
    X1     float64 `json:"x1"`
    Y1     float64 `json:"y1"`
    X2     float64 `json:"x2"`
    Y2     float64 `json:"y2"`
    Width  float64 `json:"width"`
    Height float64 `json:"height"`
}

type Position struct {
    Bounding Rect   `gorm:"embedded;embeddedPrefix:bounding_"`
    Rects    []Rect // how to save it?
    Page     int32
}

type Highlight struct {
    Id       string `gorm:"primaryKey"`
    Content  string
    Color    string
    ImageId  string
    UserId   string
    BookId   string
    Page     int32
    Position Position `gorm:"embedded;embeddedPrefix:position_"`
    Type     HighlightType

    CreatedAt time.Time
    UpdatedAt time.Time
    DeletedAt gorm.DeletedAt `gorm:"index"`
}

Store code

func (s *HighlightStore) GetHighlight(ctx context.Context, id string) (*types.Highlight, error) {
    var highlight types.Highlight

    s.db.First(&highlight, "id = ?", id)
    return &highlight, nil

}
func (s *HighlightStore) CreateHighlight(ctx context.Context, highlight *types.Highlight) (*types.Highlight, error) {
    result := s.db.Create(highlight)
    if result.Error != nil {
        return nil, result.Error
    }
    return highlight, nil
}

func NewHighlightStore(connect config.PostgresConnectString) *HighlightStore {
    db, err := gorm.Open(postgres.Open(string(connect)), &gorm.Config{})
    if err != nil {
        fmt.Println("highlight db connect failed: ", err)
    }
    db.AutoMigrate(&types.Highlight{}, &types.Position{}, &types.Rect{})
    return &HighlightStore{
        db: db,
    }
}

After create highlight like (I sure I convert the value from json to correct value object)

{
    "highlight": {
        "id": "53",
        "content": "hello",
        "color": "do nulla",
        "image_id": "http://dummyimage.com/400x400",
        "user_id": "11",
        "book_id": "2",
        "page": 1,
        "position": {
            "bounding": {
                "x1": 73,
                "y1": 87,
                "x2": 10,
                "y2": 65,
                "width": 91,
                "height": 32
            },
            "rects": [
                {
                    "x1": 65,
                    "y1": 53,
                    "x2": 48,
                    "y2": 88,
                    "width": 43,
                    "height": 20
                }
            ],
            "page": 1
        },
        "type": "HIGHLIGHT_TYPE_TEXT"
    }
}

I got [error] invalid embedded struct for Highlight's field Position, should be struct, but got types.Position

The document you expected this should be explained

Expected answer

I want to know how to code my case. How to save a nest model or best practices