Home > Article > Backend Development > How to Find a Document by _id Using bson.RawValue in 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.
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>
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.
The above is the detailed content of How to Find a Document by _id Using bson.RawValue in mongo-go-driver?. For more information, please follow other related articles on the PHP Chinese website!