How do I convert a primitive.ObjectID to a string in Go using the mongo-driver?

Converting Primitive.ObjectID to String in Go with Mongo-Driver

When working with MongoDB in Go using the mongo-driver, developers may encounter the need to convert a primitive.ObjectID to a string. However, attempting to cast a primitive.ObjectID directly to a string using type assertion can result in the error:

panic: interface conversion: interface {} is primitive.ObjectID, not string

This is because primitive.ObjectID is a distinct type, and interface{} cannot be directly type asserted to primitive.ObjectID. To convert a primitive.ObjectID to a string representation, the ObjectID.Hex() method can be utilized. Here's an example:

package main

import (
    "context"
    "fmt"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

func main() {
    // Connect to MongoDB
    client, err := mongo.Connect(context.Background(), options.Client().ApplyURI("mongodb://localhost:27017"))
    if err != nil {
        panic(err)
    }
    defer client.Disconnect(context.Background())

    // Get the ObjectId from a MongoDB document
    mongoDoc := bson.D{{"_id", primitive.NewObjectID()}}

    // Convert ObjectId to string using ObjectID.Hex()
    stringObjectID := mongoDoc["_id"].(primitive.ObjectID).Hex()
    fmt.Println(stringObjectID) // Output: 03174bcc88dea692233713e1
}

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