1

What happens when there is a minor change in the smart contract and I run truffle migrate command.

Example:

//before
contract test{
    function display() public returns (string){
       return "message";
    }   
 }

//after
contract test{
    uint temp; //new var
    function display() public returns (string){
       return "updated message"; //changed message
    }   
 }

Ideally, it should deploy the smart contract in a different address. However, in the console, it says: Everything is up to date, there is nothing to compile. Also, in ganache, I don't see a contract creation transaction. Although, in the contracts section of ganache, I can see new storage variable "temp". How is it possible if the new contract is not deployed?

1 Answer 1

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Yes, your contract was not deployed. To deploy your new contract you have to use truffle migrate --reset. Be aware that the contract is deployed at a new address and the old contract still remains on the blockchain.

To "override" your current contract (in reality it's not overriden) you have to use the Proxy Pattern. OpenZeppelin provides a good explanation of this: https://docs.openzeppelin.com/upgrades/

2
  • Thanks for answering. I just have a question. If the contract is not deployed then how am I able to access new methods that I added? so basically when I am calling the display method "updated message" is returned. Jun 22, 2020 at 13:06
  • You have to redeploy via truffle migrate --reset
    – wero026
    Jun 22, 2020 at 13:39

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