I have 2 contracts that deployed with truffle. Now I extended it and my contracts require some bootstrap actions like "set some address" or "set in contract1 address of contract2".

I will not change contracts to make it dependable or mention one contract inside another. I want just to call function contract1.setX(address_of_contract2) and contract2.setY(address_of_contract1).

How it could be done using truffle migration engine (not manually)?

3 Answers 3


With help of Karthikeyan Thangavel and Truffle docs I finally made it works:

module.exports = async function(deployer) {
  let aInst, bInst;

  await Promise.all([

  instances = await Promise.all([

  aInst = instances[0];
  bInst = instances[1];

  results = await Promise.all([

  const xCheck = await aInst.x.call();
  const yCheck = await bInst.y.call();

  console.log('X: ', xCheck, bInst.address);
  console.log('Y: ', yCheck, aInst.address);
  • Not sure if web3 syntax has changed, but if you encounter the error value.forEach is not a function you need to put the parameters in the function call into an array, such as aInst.setX([bInst.address]) Oct 8, 2018 at 20:01

I have a similar requirement (my contracts are named NppToken and CrowdSale), and here's how I'm handling it (note that CrowdSale uses the NppToken's address as a constructor argument):

module.exports = async function(deployer) {
  deployer.deploy(NppToken).then(() => {
    return deployer.deploy(CrowdSale, NppToken.address);
  }).then(async () => {
    var token = await NppToken.deployed();
    await token.transferOwnership(CrowdSale.address);       
  • Did this work for you? I get a syntax error: Unexpected token function
    – K Kolluru
    Apr 19, 2018 at 12:42
  • Yes, this is my actual deployment script, but yours might be different depending on your design (e.g. if you don't have transferOwnership in your token).
    – ulu
    Apr 19, 2018 at 15:13
  • ok. I have problem with async function() step. it says unexpected token 'function'
    – K Kolluru
    Apr 19, 2018 at 19:27
  • That's because it doesn't support the "async" keyword. Which Node version do you use? Anyway, you should be able to rewrite this as a chain of then-s, without async. The first async is not needed, you may start with removing it and see how the rest works.
    – ulu
    Apr 23, 2018 at 15:20

You can achieve that using the promise function.

deployer.deploy(A).then(function() {
   deployer.deploy(B).then(funtion() {
       return A.setX(B.address);
     return B.setX(A.address);

Using the promise function you can do functionalities after deploying the contract. For more details refer truffle docs.

  • 1
    Thank you for help, I already reviewed documentatop you've pointed. Unfortunately it simply does not works. In your example I got error TypeError: A.setX is not a function.
    – Alex G.P.
    Nov 13, 2017 at 8:10

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