How to Find a Document by _id in MongoDB using Go?

Finding a Document by _id in MongoDB using Go

To find a document by its auto-generated _id field using the mongo-go-driver, instantiate an ObjectID and use it as the value for the "_id" field in the query filter.

In the provided code, the bson.RawValue is used, but it's not necessary. Instead, use primitive.ObjectIDFromHex("") to convert the hexadecimal representation of the _id directly.

Updated Code:

<code class="go">import (
    "context"
    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
    "go.mongodb.org/mongo-driver/mongo/primitive"
)

func main() {
    ctx := context.Background()

    // Create a client
    client, err := mongo.Connect(ctx, options.Client().ApplyURI("mongodb://<host>:<port>"))
    if err != nil {
        // handle error
    }
    defer client.Disconnect(ctx)

    // Get a collection
    collection := client.Database("database").Collection("collection")

    // Parse the ObjectID from hexadecimal string
    id, err := primitive.ObjectIDFromHex("5c7452c7aeb4c97e0cdb75bf")
    if err != nil {
        // handle error
    }

    // Find the document by _id
    result := collection.FindOne(ctx, bson.M{"_id": id})
}</code>

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