How to Find a Document by _id Using bson.RawValue in mongo-go-driver?

Finding a Document by _id Using mongo-go-driver

In mongo-go-driver, you can find a document by its auto-generated _id field. However, an issue may arise when the _id field is provided as a bson.RawValue.

Using bson.RawValue for _id

The provided code snippet attempts to find a document using a bson.RawValue object, but it returns nothing. To rectify this, convert the RawValue into an ObjectID using primitive.ObjectIDFromHex.

<code class="go">import (
    "context"
    "encoding/hex"
    "encoding/json"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/bson/bsoncodec"
    "go.mongodb.org/mongo-driver/bson/bsonprimitive"
    "go.mongodb.org/mongo-driver/mongo"
)

func findDocumentByID(collection *mongo.Collection, ctx context.Context, id string) (*bson.Raw, error) {
    objID, err := bsonprimitive.ObjectIDFromHex(id)
    if err != nil {
        return nil, err
    }

    value := collection.FindOne(ctx, bson.M{"_id": objID})
    return value.DecodeBytes()
}</code>

Example Usage

Consider the following document in your MongoDB database:

<code class="json">{
  "_id": "5c7452c7aeb4c97e0cdb75bf",
  "name": "John Doe",
  "age": 30
}</code>

To find this document using the above function, provide the _id as a string:

<code class="go">id := "5c7452c7aeb4c97e0cdb75bf"
value, err := findDocumentByID(collection, ctx, id)
if err != nil {
  return nil, err
}</code>

The value variable will now contain the decoded bytes of the found document.

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