fabcar.go

func (s *SmartContract) changeCarOwner(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

        if len(args) != 2 {
                return shim.Error("Incorrect number of arguments. Expecting 2")
        }

        carAsBytes, _ := APIstub.GetState(args[0])
        car := Car{}

        json.Unmarshal(carAsBytes, &car)
        car.Owner = args[1]

        carAsBytes, _ = json.Marshal(car)
        APIstub.PutState(args[0], carAsBytes)

        return shim.Success(nil)
}