Update/Replace mongodb document using struct & mongodb/mongo-go-driver

Question

I am trying to update/replace a mongodb document using a struct but i keep on getting err: update document must contain key beginning with '$'

collection := r.client.Database(database).Collection(greetingCollection)
payment.MongoID = objectid.New()
filter := bson.NewDocument(bson.EC.String("id", payment.ID))
_, err := collection.UpdateOne(ctx, filter, payment)
return err

Nicolas Gaborel · Accepted Answer · 2020-03-31 08:09:45Z

25

I believe the accepted answer did not work for me because I am using the go.mongodb.org/mongo-driver package. With this package, the syntax is even simpler:

update := bson.M{
        "$set": yourDocument,
    }

collection.UpdateOne(ctx, filter, update)

answered Mar 31, 2020 at 8:09

Nicolas Gaborel

5791 gold badge7 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

tsg Over a year ago

works like a charm on go.mongodb.org/mongo-driver

Jonathan Kittell Over a year ago

update := bson.D{{"$set", document}} works too

nijm · Accepted Answer · 2021-01-25 16:10:05Z

9

You should provide an update statement instead of a document as third parameter to the Collection.UpdateOne method. For example:

update := bson.NewDocument(
    bson.EC.SubDocumentFromElements(
        "$set",
        bson.EC.Double("pi", 3.14159),
    ),
)
collection.UpdateOne(ctx, filter, update)

See more on the available update operators in the MongoDB docs (the keys begin with '$').

edited Jan 25, 2021 at 16:10

answered Oct 7, 2018 at 12:08

nijm

2,21815 silver badges29 bronze badges

3 Comments

dev.bmax Over a year ago

One doesn't use bson.M in mongo-go-driver. Please, look at this example

Madu Alikor Over a year ago

The example from my understanding just updates a root property on the document called pi? I wish to replace the whole document with a struct called payment how do i do that?

nijm Over a year ago

If you want to replace use ReplaceOne instead of UpdateOne

Collectives™ on Stack Overflow

Update/Replace mongodb document using struct & mongodb/mongo-go-driver

2 Answers 2

2 Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related