2019-02-20 03:47



So I am trying to use https://github.com/mongodb/mongo-go-driver to connect to a mongo database in golang.

Here is my connection handler:

var DB *mongo.Database

func CreateConnectionHandler()(*mongo.Database, error){
    fmt.Println("inside createConnection in database package")
    fmt.Println("in CreateConnectionHandler and SERVER_CONFIG: ")
    if os.Getenv("SERVER_CONFIG")=="kubernetes"{
        fmt.Println("inside kubernetes db config")
        uri = "mongodb://patientplatypus:SUPERSECRETPASSDOOT@
    }else if os.Getenv("SERVER_CONFIG")=="compose"{
        fmt.Println("inside compose db config")
        uri = "mongodb://datastore:27017"
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    client, err := mongo.Connect(ctx, uri)
    if err != nil {
        return nil, fmt.Errorf("mongo client couldn't connect: %v", err)
    DB := client.Database("platypusNEST")
    return DB, nil

And the error I am getting:

api         | database/connection.go:29:30: cannot use uri (type 
string) as type *options.ClientOptions in argument to mongo.Connect

So I tried replacing uri with the connection string like this:

client, err := mongo.Connect(ctx, "mongodb://datastore:27017")

But I still got the error.

Compare this with what is in the documentation:

ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
client, err := mongo.Connect(ctx, "mongodb://localhost:27017")

And it is exactly the same! I'm really not sure why there is this error. Any ideas?

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  • douye1940 douye1940 2年前

    To those who come searching - the docs are out of date as of this posting, but their latest push here: https://github.com/mongodb/mongo-go-driver/commit/32946b1f8b9412a6a94e68ff789575327bb257cf has them doing this with the connect:

    client, err := mongo.NewClient(options.Client().ApplyURI(uri))

    You will also now need to import the options package. Happy hacking.

    EDIT: thanks vcanales for finding this - you're a gentleman and a scholar.

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  • duan198727 duan198727 2年前

    In addition to the accepted answer - this snippet below may be improved by using an environment variable to pass in the Mongodb URL.

    package main
    import (
    func ConnectMongo() {
       var (
           client     *mongo.Client
           mongoURL = "mongodb://localhost:27017"
       // Initialize a new mongo client with options
       client, err := mongo.NewClient(options.Client().ApplyURI(mongoURL))
       // Connect the mongo client to the MongoDB server
       ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
       err = client.Connect(ctx)
       // Ping MongoDB
       ctx, _ = context.WithTimeout(context.Background(), 10*time.Second)
       if err = client.Ping(ctx, readpref.Primary()); err != nil {
           fmt.Println("could not ping to mongo db service: %v
    ", err)
       fmt.Println("connected to nosql database:", mongoURL)
    func main() {

    More information on options and readpref respectively: https://docs.mongodb.com/manual/reference/method/cursor.readPref/index.html https://docs.mongodb.com/manual/core/read-preference/

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