Turffle can't deploy without --reset

Question

I have a very simple migration script, and I believe I did nothing wrong.

var Migrations = artifacts.require("./Migrations.sol");
var HW = artifacts.require("./HelloWorld.sol");

module.exports = function(deployer) {
    deployer.deploy(Migrations);
    deployer.deploy(HW);
};

However, truffle migrate just doesn't want to deploy without the --reset option.

I have even tried to do migrate without compile, and truffle do aware that my HelloWorld.sol had been changed, and compile automatically. But it just doesn't want to deploy.

Answer 1

It is what truffle migrate do, as its doc said. It will deploy the contract based on the deploy files, like 2_deploy_HelloWorld.js. If you want to update some contract after editing, you can create another deploy file, redeploy the contract, update some contract state data, etc.
If you just want to re-deploy, then just add '--reset' will be fine.