Deploying contract from contract

Question

I try something like this:

Child.sol

pragma solidity ^0.4.6;
contract Child {
  address owner;

  function Child() {
    owner = msg.sender;
  }
}

Parent.sol

pragma solidity ^0.4.6;

import "./Child.sol"

contract Parent {

  address owner;


  function Parent(){
    owner = msg.sender;
  }

  function createChild() {
    Child child = new Child()
  }
}

Then I deploy Parent.sol. I can find this transaction on etherscan. Then I call createChild() function, but the contract is not deploying, because I can't find any new transactions.

So the question is, how should I do it right. Thank you.

Or should I just archive all adresses of the Child contracts in Parent contract? Then Parent contract can be really heavy.

Answer 1

It's possible you aren't seeing the Child contract because it's in an internal transaction. Look under the "Internal Transaction" tab on etherscan (on the Parent contract's page) to check.

Answer 2

It's a good start in my opinion, but Parent does say anything about child so it's not useful.

Some ideas.

    pragma solidity ^0.4.6;

    contract Child {

      address public owner; // public, so you can see it when you find the child

      function Child() {
        owner = msg.sender;
      }
    }

and ...

pragma solidity ^0.4.6;

import "./Child.sol"

contract Parent {

  address owner;
  address[] public children; // public, list, get a child address at row #
  event LogCreatedChild(address child); // maybe listen for events

  function Parent(){
    owner = msg.sender;
  }

  function createChild() {
    Child child = new Child();
    LogChildCreated(child); // emit an event - another way to monitor this
    children.push(child); // you can use the getter to fetch child addresses
  }
}

I just did that right here in SE so I hope I didn't flub the syntax on you.

Hope it helps.