You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: db.go
    path of file: ./repos/goby/native/db
    
    the code of the file until where you have to start completion: package db

import (
	"fmt"

	"github.com/goby-lang/goby/vm"
	"github.com/goby-lang/goby/vm/errors"
	"github.com/jmoiron/sqlx"

	// all packages imported by this need postgres
	_ "github.com/lib/pq"
)

type (
	// Object is an imported object from vm
	Object = vm.Object
	// GoObject is an imported object from vm
	GoObject = vm.GoObject
	// VM is an imported object from vm
	VM = vm.VM
	// Thread is an imported object from vm
	Thread = vm.Thread
	// Method is an imported object from vm
	Method = vm.Method
	// StringObject is an imported object from vm
	StringObject = vm.StringObject
)

func init() {
	vm.RegisterExternalClass("db", vm.NewExternalClassLoader("DB", "db.gb",
		// class methods
		map[string]vm.Method{
			"get_connection": ge
    
func getConnection(receiver vm.Object, sourceLine int, t *vm.Thread, args []vm.Object) vm.Object {
	if len(args) != 2 {
		return t.VM().InitErrorObject(errors.ArgumentError, sourceLine, errors.WrongNumberOfArgument, 2, len(args))
	}

	driverName, ok := args[0].(*vm.StringObject)

	if !ok {
		return t.VM().InitErrorObject(errors.ArgumentError, sourceLine, "Expect database's driver name to be a String object. got: %s", args[0].Class().Name)
	}

	dataSource, ok := args[1].(*vm.StringObject)

	if !ok {
		return t.VM().InitErrorObject(errors.ArgumentError, sourceLine, "Expect database's data source to be a String object. got: %s", args[1].Class().Name)
	}

	conn, err := sqlx.Open(driverName.Value().(string), dataSource.Value().(string))

	if err != nil {
		return t.VM().InitErrorObject(errors.InternalError, sourceLine, err.Error())
	}

	connObj := t.VM().InitObjectFromGoType(conn)
	return connObj

}