查找文档

type Restaurant struct {
	ID           primitive.ObjectID `bson:"_id"`
	Name         string
	RestaurantId string `bson:"restaurant_id"`
	Cuisine      string
	Address      interface{}
	Borough      string
	Grades       []interface{}
}

coll := client.Database("sample_restaurants").Collection("restaurants")
// Creates a query filter to match documents in which the "name" is
// "Bagels N Buns"
filter := bson.D{{"name", "Bagels N Buns"}}
// Retrieves the first matching document
var result Restaurant
err = coll.FindOne(context.TODO(), filter).Decode(&result)
// Prints a message if no documents are matched or if any
// other errors occur during the operation
if err != nil {
	if err == mongo.ErrNoDocuments {
		return
	}
	panic(err)
}