문서 업데이트

filter := bson.D{{"_id", "10006546"}}
update := bson.D{{"$set", bson.D{{"name", "Ribiera River View Duplex"}}},
   {"$inc", bson.D{{"accomodates", 1}}}}
result, err := collection.UpdateOne(context.TODO(), filter, update)
fmt.Printf("Documents matched: %v\n", result.MatchedCount)
fmt.Printf("Documents updated: %v\n", result.ModifiedCount)

// Updates documents that match a query filter by using the Go driver
package main
import (
	"context"
	"fmt"
	"log"
	"os"
	"github.com/joho/godotenv"
	"go.mongodb.org/mongo-driver/v2/bson"
	"go.mongodb.org/mongo-driver/v2/mongo"
	"go.mongodb.org/mongo-driver/v2/mongo/options"
)
// Defines a Restaurant struct as a model for documents in the "restaurants" collection
type Restaurant struct {
	ID            bson.ObjectID `bson:"_id"`
	Name          string        `bson:"name"`
	Cuisine       string        `bson:"cuisine"`
	AverageRating float64       `bson:"avg_rating,omitempty"`
}
func main() {
	if err := godotenv.Load(); err != nil {
		log.Println("No .env file found")
	}
	var uri string
	if uri = os.Getenv("MONGODB_URI"); uri == "" {
		log.Fatal("You must set your 'MONGODB_URI' environment variable. See\n\t https://www.mongodb.com/ko-kr/docs/drivers/go/current/connect/mongoclient/#environment-variable")
	}
	client, err := mongo.Connect(options.Client().ApplyURI(uri))
	if err != nil {
		panic(err)
	}
	defer func() {
		if err = client.Disconnect(context.TODO()); err != nil {
			panic(err)
		}
	}()
	coll := client.Database("sample_restaurants").Collection("restaurants")
	filter := bson.D{{"cuisine", "Pizza"}, {"borough", "Brooklyn"}}
	// Creates instructions to update the values of the "avg_rating" field
	update := bson.D{{"$set", bson.D{{"avg_rating", 4.5}}}}
	// Updates documents in which the value of the "Cuisine"
	// field is "Pizza"
	result, err := coll.UpdateMany(context.TODO(), filter, update)
	if err != nil {
		panic(err)
	}
	// Prints the number of updated documents
	fmt.Printf("Documents updated: %v\n", result.ModifiedCount)
	// end updatemany
	// When you run this file for the first time, it should print output similar to the following:
	// Documents updated: 296
}