yokoe/gorm-snippets

func findBookByTitle(db *gorm.DB, arg string) (*model.Book, error) {
    if len(arg) == 0 {
        return nil, xerrors.Errorf("Title must be non-nil.")
    }
    var obj model.Book
    if err := db.Find(&obj, "`title` = ?", arg).Error; err != nil {
        return nil, xerrors.Errorf("failed to find model.Book by Title: %w", err)
    }
    return &obj, nil
}