views.go

//...

func (c *controller) detail(ctx context.Context, request *web.Request) web.Result {
	questionID, err := strconv.Atoi(request.Params["question_id"])
	if err != nil {
		return c.responder.ServerError(err)
	}
	
	var viewData struct {
		Question     Question
		ErrorMessage string
	}

	if c.db.Preload("Choices").First(&viewData.Question, questionID).RecordNotFound() {
		return c.responder.NotFound(gorm.ErrRecordNotFound)
	}

	return c.responder.Render("detail", viewData)
}