Go: Cloud Firestore のデータを削除 (Delete)

firestore_delete.go

// ---------------------------------------------------------------
//
//	firestore_delete.go
//
//					Dec/16/2020
//
// ---------------------------------------------------------------
package main
 
import (
	"context"
	"fmt"
	"log"
	"os"
 
	firebase "firebase.google.com/go"
	"google.golang.org/api/option"
)
 
// ---------------------------------------------------------------
func main() {
	fmt.Fprintf (os.Stderr,"*** 開始 ***\n")
	key_in := os.Args[1]
	fmt.Printf ("key_in = %s\n" , key_in)
	// 初期化
	ctx := context.Background()
	sa := option.WithCredentialsFile("./application_default_credentials.json")
	app, err := firebase.NewApp(ctx, nil, sa)
	if err != nil {
		log.Fatalln(err)
	}
 
	client, err := app.Firestore(ctx)
	if err != nil {
		log.Fatalln(err)
	}

_, err = client.Collection("cities").Doc(key_in).Delete(ctx)
if err != nil {
        // Handle any errors in an appropriate way, such as returning them.
        log.Printf("An error has occurred: %s", err)
}
 
	// 切断
	defer client.Close()

	fmt.Fprintf (os.Stderr,"*** 終了 ***\n")
}

// ---------------------------------------------------------------

実行コマンド

project_id="project-dec16-2020"
echo $project_id
export GOOGLE_CLOUD_PROJECT=$project_id
#
go run firestore_delete.go t0923