func findReceipt(conn db.ConnectionInterface, userGUID, clientID, kindID string) (models.Receipt, error) { receipt := models.Receipt{} err := conn.SelectOne(&receipt, "SELECT * FROM `receipts` WHERE `user_guid` = ? AND `client_id` = ? AND `kind_id` = ?", userGUID, clientID, kindID) if err != nil { return models.Receipt{}, err } return receipt, nil }