How to Convert a primitive.ObjectID to a String in Go?

Converting Primitive.ObjectID to String in Go

When working with MongoDB in Go using the mongo-driver, it's common to encounter a scenario where you need to convert a primitive.ObjectID to a string. This conversion is necessary for certain operations, such as displaying the ID as a string or using it in external systems.

One common approach is to use type assertion, like this:

mongoId := mongoDoc["_id"]
stringObjectID := mongoId.(string)

However, this code may throw an error if the value stored in mongoId is not actually a string. The error message will indicate that the interface value is of type primitive.ObjectID, not a string.

To correctly convert a primitive.ObjectID to a string, you need to understand that the value stored in mongoId is actually an instance of the primitive.ObjectID type wrapped in an interface value. To access the primitive.ObjectID instance, you can use type assertion, like this:

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

Now, you can use the Hex() method of primitive.ObjectID to get the hex representation of the object ID as a string:

stringObjectID := mongoId.Hex()

This method will return a string that represents the 12-byte hexadecimal representation of the primitive.ObjectID, which you can use for your desired purposes.

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