Calling Truffle Commands through a script

Question

I made the following contract:

pragma solidity ^0.4.17;

contract Checking {

    mapping( string => string ) PersonHash;

    function AddHash(string name, string hash) {

        PersonHash[name] = hash;

    }

    function GetHash (string name) public returns (string) {

        return PersonHash[name];

    }

}

Now I want to call this function from truffle using exec command.

I wrote a js file named checking.js with the following commands

var Checking = artifacts.require("./Checking.sol");

module.exports = function (deployer) {

  var ss;

  Checking.deployed().then(function(deployed){ ss=deployed; });

  ss.GetHash.call("sal");

}

I get an output error saying

Type Error: cannot read property 'GetHash' of undefined at .....

Answer 1

Seems like its due to async behavior that is returned by Checking.deployed()

Change this:

var Checking = artifacts.require("./Checking.sol");

To this:

var Checking = artifacts.require("./Checking.sol").new();

 and then try.