问Gorm ()查询，没有填充在定义的结构中定义的所有字段，以保存结果集

EN

// request object supplied in FetchTransactionWithHighestExpiry:
type ProvisionRequest struct {
        Identity string     `json:"identity"`
        IdentityType string `json:"identityType"`
}

// struct to model database table
type Transactions struct {
        Identity string `gorm:"index;not null"`
        IdentityType string 
}

// method where there is problem
func (c *DBClient) FetchTransactionWithHighestExpiry(req *model.ProvisionRequest) (model.Transactions, error)  {
    var tx model.Transactions
    res := c.client.Model(&model.Transactions{}).Where("identity = ? AND endDate  > ?", req.Identity, time.Now().Unix()).Order("endDate desc").First(&tx)
    return tx, res.Error
}

-- rp.transactions definition

CREATE TABLE `transactions` (
  `transaction_id` varchar(255) NOT NULL,
  `identity` varchar(255) DEFAULT NULL,
  `identityType` varchar(15) DEFAULT NULL,
  `serviceId` varchar(255) DEFAULT NULL,
  `partnerId` varchar(255) DEFAULT NULL,
  `countryId` varchar(255) DEFAULT NULL,
  `updatedAt` timestamp NULL DEFAULT NULL,
  `createdAt` timestamp NULL DEFAULT NULL,
  `startDate` int NOT NULL,
  `endDate` int NOT NULL,
  PRIMARY KEY (`transaction_id`),
  KEY `identity_idx` (`identity`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;