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