コード

# Model.go

package real_estates

import (
  "../stations"
)

type RealEstate struct {
  RealEstateId string `json:"real_estate_id" dynamo:"real_estate_id"`
  Name string `json: "name" dynamo:"name"`
  Code string `json: "code" dynamo:"code"`
  Rent string `json: "rent" dynamo:"rent"`
  AdministrativeExpenses string `json: "administrative_expenses" dynamo:"administrative_expenses"`
  SecurityDeposit string `json: "security_deposit" dynamo: "security_deposit"`
  KeyMoney string `json: "key_money" dynamo: "key_money"`
  Deposit string `json: "deposit" dynamo: "deposit"`
  FloorPlan string `json: "floor_plan" dynamo: "floor_plan"`
  FloorPlanDetail string `json: "floor_plan_detail" dynamo: "floor_plan_detail"`
  Square string `json: "square" dynamo: "square"`
  Direction string `json: "direction" dynamo: "direction"`
  Type string `json: "type" dynamo: "type"`
  Old string `json: "old" dynamo: "old"`
  Address string `json: "address" dynamo: "address"`
  Storey string `json: "storey" dynamo: "storey"`
  Floors string `json: "floors" dynamo: "floors"`
  BuiltDate string `json: "built_date" dynamo: "built_date"`
  Stations []stations.Station
  Images []string `json: "images" dynamo: "images"`
  IsSeparatedBathToilet bool `json: "is_separated_bath_toilet" dynamo: "is_separated_bath_toilet"`
  HasAirConditioner bool `json: "has_air_conditioner" dynamo: "has_air_conditioner"`
  IsWoodenFloor bool `json: "is_wooden_floor" dynamo: "is_wooden_floor"`
  HasWashMachineSpace bool `json: "has_wash_machine_space" dynamo: "has_wash_machine_space"`
  HasWashlet bool `json: "has_washlet" dynamo: "has_washlet"`
  HasElevator bool `json: "has_elevator" dynamo: "has_elevator"`
  IsSeparatedWashroom bool `json: "is_separated_washroom" dynamo: "is_separated_washroom"`
  HasParking string `json: "has_parking" dynamo: "has_parking"`
  HasBicycleParking bool `json: "has_bicycle_parking" dynamo: "has_bicycle_parking"`
  Insurance string `json: "insurance" dynamo: "insurance"`
  CanApplyNow string `json: "can_apply_now" dynamo: "can_apply_now"`
  Structure string `json: "structure" dynamo: "structure"`
  Commissions string `json: "commissions" dynamo: "commissions"`
  TotalUnits string `json: "total_units" dynamo: "total_units"`
  InitialCost string `json: "initial_cost" dynamo: "initial_cost"`
  OtherCost string `json: "other_cost" dynamo: "other_cost"`
  HasAutoLock bool `json: "has_auto_lock" dynamo: "has_auto_lock"`
  IsPetFriendly bool `json: "is_pet_friendly" dynamo: "is_pet_friendly"`
  Url string `json: "url" dynamo: "url"`
  CreatedAt string `json:"created_at" dynamo:"created_at"`
  UpdatedAt string `json:"updated_at" dynamo:"updated_at"`
  DeletedAt string `json:"deleted_at" dynamo:"deleted_at"`
  DistrictId string `json:"district_id" dynamo:"district_id"`
}

package real_estates

import (
	"os"
	"../../helpers/dynamodb"
)

func BatchWrite(realEstates ...RealEstate) (error) {
	table := dynamodb.Table(os.Getenv("STAGE") + "_real_estates")
	items := make([]interface{}, 0)
	for _, value := range realEstates {
		items = append(items, value)
	}

	_, err := table.Batch().Write().Put(items...).Run()

	return err

}

実現したいこと

上記のコードを用いて、Dynamodbに対しBatchWriteし、RealEstateのデータを書き込みたい

問題

dynamodbに保存されるデータが以下のようになってしまします。

{
  "Address": "XXX",
  "Code": "XXX",
  "Commissions": "XXX",
  "district_id": "XXX",
  "Floors": "XXX",
  "HasAirConditioner": XXX,
  "HasAutoLock": XXX,
  "HasBicycleParking": XXX,
  "HasElevator": XXX,
  "HasWashlet": XXX,
  "HasWashMachineSpace": XXX,
  "Images": [],
  "Insurance": "XXX",
  "IsPetFriendly": XXX,
  "IsSeparatedBathToilet": XXX,
  "IsSeparatedWashroom": XXX,
  "IsWoodenFloor": XXX,
  "Name": "XXX",
  "real_estate_id": "XXX",
  "Rent": "XXX",
  "Square": "XXX",
  "Stations": [],
  "Storey": "XXX",
  "Structure": "XXX",
  "Url": "XXX"
}

このように「real_estate_id」と「distinct_id」以外は大文字になってしまします。これをストラクトタグで定義したようにスネークケースにしたいです。