How to Retrieve a MongoDB Document by Its Object ID in Go?

Finding a Document by Object ID in MongoDB with Go

You're attempting to retrieve a MongoDB document using its auto-generated _id field, but your current code fails to return a result. Let's dive into the issue and provide a solution.

In the provided code, you're creating a RawValue to represent the document ID:

var documentID bson.RawValue
documentID.Type = 7
documentID.Value = []byte("5c7452c7aeb4c97e0cdb75bf")

However, this approach is unnecessary. You can directly create an ObjectID using the primitive.ObjectIDFromHex function:

objID, _ := primitive.ObjectIDFromHex("5c7452c7aeb4c97e0cdb75bf")

With the correct ObjectID, you can then issue a FindOne operation on your collection:

value := collection.FindOne(ctx, bson.M{"_id": objID})

This code should now correctly retrieve the document you're seeking from the database.

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