[英]Environment variable returns an empty string from a function in golang library
[英]Golang Mongodb insertOne returns empty ID ObjectID("000000000000000000000000")
我正在使用 Go 和 MongoDB 並創建一個新記錄,但是當我將 insertedID 轉換為字符串時,它返回 ObjectID("0000000000000000000000000")。
client := connect()
db := client.Database("godb")
// fmt.Println(db)
usersCollection := db.Collection("users")
result, err := usersCollection.InsertOne(ctx, bson.D{
{Key: "title", Value: "The Polyglot Developer Podcast"},
{Key: "author", Value: "Nic Raboy"},
})
if err != nil {
log.Fatal(err)
}
newID := result.InsertedID
fmt.Println("InsertOne() newID:", newID)
fmt.Println("InsertOne() newID type:", reflect.TypeOf(newID))
oid, _ := newID.(primitive.ObjectID)
fmt.Println(oid)
OUTPUT
InsertOne() newID: ObjectID("5e947e7036a5c1587fa4a06e")
InsertOne() newID type: primitive.ObjectID
ObjectID("000000000000000000000000")
您必須為 ID 指定omitempty !
type User struct {
ID primitive.ObjectID `json:"_id,omitempty" bson:"_id,omitempty"`
}
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