How to pass constructor parameters to a contract using Truffle?

Question

I am using testrpc and truffle for deploying contracts.I want to pass constructor parameters while deploying.

    contract User { 
          string public userName;

          function User(string _name) {
                 userName=_name;
          }

   }

I am using contractname.deployed() for deploying contract.

      var user=User.deployed()

This deployment command won't initializes the userName parameter.

How to pass _name to this contract using truffle?

Answer 1

In Truffle, constructor params go in /migrations. So, something like:

deployer.deploy(User, "foo");

User.deployed() will be a User contract that was deployed with _name="foo"

Answer 2

In my 2_deploy_contracts.js I have this:

var arg1 = 100;
deployer.deploy(User, arg1);

line have to have some variable initialized or can I pass an uninitialized input? Also, when I run truffle tests, I still need to pass constructor arguments, when wring those tests?? Which of the two would truffle accept?

for example, truffle tests:

var totsup = 50;
const UserTokenMock = artifacts.require('UserToken');
contract('UserTokenMock', function ([_, owner, recipient, anotherAccount]) {
  const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000';

  beforeEach(async function () {
    this.token = await UserTokenMock.new(totSup);
    owner = this.owner;
  });
});

thanks!