Use GORM Library with sheriff package

[sandeepchowdary7]

I'm trying to use the Golang Sheriff package with GORM Library somehow I'm getting an empty response. Tried a couple of ways no luck. Is it possible? Any help that would be great. TIA

//STRUCT
    type Book struct {
    ID        uint `json:"id" gorm:"primary_key" groups:"not_detail,detail"`
    Realname      string `json:"real_name" groups:"not_detail,detail"`
    LanguageId int `json:"language_id" groups:"not_detail,detail"`
    Language   Language `json:"Language" groups:"detail"`
    CreatedAt time.Time `json:"created_at" groups:"not_detail,detail"`
    UpdatedAt time.Time `json:"updated_at" groups:"not_detail,detail"`
}

//CONTROLLER LOGIC
func FindBooks(c *gin.Context)  {
    db := c.MustGet("db").(*gorm.DB)
    var books []models.Book
    result := db.Find(&books)

    o := sheriff.Options{
        Groups: []string{"not_detail"},
    }

    d, err := sheriff.Marshal(&o, result)
    if err != nil {
        panic(err)
    }

    c.JSON(http.StatusOK, gin.H{"data":d})
}