How to Convert a `primitive.ObjectID` to a String in Go with the MongoDB Driver?

Converting Primitive.ObjectID to String in Go with MongoDB Driver

When working with the MongoDB driver from go.mongodb.org/mongo-driver, converting a primitive.ObjectID to a string can be challenging.

Issue

Attempting to type assert a mongo-driver.ObjectID to a string using mongoDoc["_id"].(string) results in a runtime panic:

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

Solution

The error occurs because mongoDoc["_id"] holds an interface value of type interface{} with a concrete value of primitive.ObjectID. To successfully convert to a string, we need to type assert the primitive.ObjectID value itself instead of the interface value.

mongoId := mongoDoc["_id"].(primitive.ObjectID)
stringObjectID := mongoId.Hex()

The Hex() method on the primitive.ObjectID type provides a hexadecimal representation of its bytes.

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