cannot set type primitive.ObjectID to ObjectID

Getting this error while binding mongodb document to GO Struct using docstore collection iterator.

Database: Azure CosmosDB mongoDb API
Go Driver: Docstore

Code details:

Cosmos DB Constructors Code

    client, err := c.newClient(ctx, true)
    if err != nil {
        log.Error("error connecting to mongodb cluster", zap.Error(err))
        return nil, err
    }

    database := client.Database(c.dbName)
    collection := database.Collection(c.collName)

    return mongodocstore.OpenCollection(collection, "", nil)

Go struct for mapping with Mongo Db document

type utterance struct {
    ID               primitive.ObjectID `docstore:"_id,omitempty"`
    User             string             `docstore:"user,omitempty"`
    Locale           string             `docstore:"Locale,omitempty"`
    Text             string             `docstore:"Text,omitempty"`
    Source           string             `docstore:"Source,omitempty"`
    Timestamp        time.Time          `docstore:"Timestamp,omitempty"`
    DocstoreRevision interface{}
}

MondoDb Document

{
    "_id" : ObjectId("60d5e18539864e948a8851a6"),
    "User" : "auth0|6049b5ef5d79540071db6a0a",
    "Locale" : "en_US",
    "Text" : "Hi",
    "Source" : "UTTERANCE_SOURCE_USER",
    "Timestamp" : {
        "$date" : 1624629637002
    },
    "DocstoreRevision" : "bf3b35d8-54ed-4a23-a08f-7d41b5c34085"
}

Method to call the docstore collection and iterate

i := s.collection.Query().Get(ctx)
    defer i.Stop()

    var results []*services.Utterance

    for {
        fmt.Println("for every document: ")
        //var native utterance
        doc := &utterance{}
        err := i.Next(ctx, doc) //error at this line
        if err == io.EOF {
            break
        } else if err != nil {
            fmt.Println(“getting to this err block“)
            return nil, err
        }

        u := doc.ToProto()
        results = append(results, u)
    }

Try setting the ID to a pointer type:

type utterance struct {
    ID               *primitive.ObjectID `docstore:"_id,omitempty"`
    User             string             `docstore:"user,omitempty"`
    Locale           string             `docstore:"Locale,omitempty"`
    Text             string             `docstore:"Text,omitempty"`
    Source           string             `docstore:"Source,omitempty"`
    Timestamp        time.Time          `docstore:"Timestamp,omitempty"`
    DocstoreRevision interface{}
}

Probably when you create the struct to be decoded the primitive.ObjectID is being initialized and the driver don't know to decode it.

And be careful. The docstore is a generic Document driver. It is not specific for MongoDB. So it probably don't work well with MongoDB specific types.

Reading the driver for mongodb https://pkg.go.dev/gocloud.dev/docstore/mongodocstore

There is a way to set what is stored in the _id field. I understand docstore don't know how to decode ObjectID from MongoDB.