Events not being received in nodejs, using truffle, ganache and metamask

Question

I'm using web3 1.0, lets say this is my smartcontract:

contract Foo {
    event NewUser(
        address userAddress,
        uint amount
    );

    function addUser() public payable{
        emit NewUser(msg.sender, msg.value);
    }
}

The events get fired in Remix perfectly well.

The problem is when I run a nodejs with express back-end and I try to watch the events with the following piece of code:

contract.events.NewUser({}, function(error, event){ 
  console.log(event); 
})
.on('data', function(event){
  console.log(event); // same results as the optional callback above
})
.on('changed', function(event){
  // remove event from local database
})
.on('error', console.error);

The first log gets called with value null and when the event can't get triggered. Does anyone have any idea what could be the issue?

Answer 1

Former HttpProvider and ganache does not support web3 1.0's event subscription. Please check out the documentation. For testing purpose for now, you may use the beta version of ganache-cli with WebsocketProvider.