Not working association for Gorm models

[EgorkZe]

Hello! I have two models

type Event struct {
	gorm.Model
	Title             string     `json:"title"`
	About             string     `json:"about"`
	StartDate         *time.Time `json:"start_date"`
	EndDate           *time.Time `json:"end_date"`
	Type              string     `json:"type"`
	Photos            []Photo    `json:"photos""`
	Comments          []Comment  `json:"comments"`
	Checkins          []User     `json:"checkins"`
	UserID            uint       `json:"user_id"`
	location.Location `location:"name:Event place`
}

and

type Photo struct {
	gorm.Model
	EventID uint `json:"event_id"`
	UserID  uint `json:"user_id"`

	Image oss.OSS `sql:"size:4294967295;" media_library:"url:/backend/{{class}}/{{primary_key}}/{{column}}.{{extension}};path:./private" json:"image"`
}

Also I implemented this func

func (event Event) MainImageURL(styles ...string) string {
	if len(event.Photos) > 0 {
		return event.Photos[0].Image.URL()
	}
	return ""
}

But there are no photos in event model, it seems association not working. What I do wrong?

[EgorkZe]

and valuer not called

ev.Meta(&admin.Meta{Name: "MainImage", FieldName: "MainImage", Label: "MainImage", Valuer: func(record interface{}, context *qor.Context) interface{} {
		if p, ok := record.(*models.Event); ok {
			result := bytes.NewBufferString("")
			tmpl, _ := template.New("").Parse("<img src='{{.image}}'></img>")
			tmpl.Execute(result, map[string]string{"image": p.MainImage()})
			return template.HTML(result.String())
		}
		return ""
	}})