So i am doing a factory for an ERC20 token contract, here is my factory code:

pragma solidity >= 0.4.0 < 0.6.0;

import "./ERC20.sol";
import "./ERC20Interface.sol";

contract Factory {
    address[] createdContract;
    mapping (address => uint256) contractNo;
    mapping (address => address) contractOwner;
    mapping (address => bool) isEIP20;
    address owner;

    event NewContractCreated(address newContractAddress, address contractCreator);

    constructor() public {
        owner = msg.sender;

    function createNewContract() payable public returns(address) {
        ERC20 newContract = new ERC20();

        isEIP20[address(newContract)] = true;
        contractOwner[address(newContract)] = msg.sender;

        emit NewContractCreated(address(newContract), msg.sender);

    function transfer(address _to, address _contractAddress)  public returns (bool) {
        ERC20Interface contractUsed = ERC20Interface(_contractAddress);
        require(contractUsed.transfer(_to, 50));
        return true;

    function ownedContract() public view returns(uint256) {
        return contractNo[msg.sender];

    function ownerOfContract(address _contractAddress) public view returns(address) {
        return contractOwner[_contractAddress];

then i deploy it on ganache test rpc using truffle, then i create a new ERC20 from the factory contract and then check for NewContractCreated event and it fine, it return the result i was expecting: Event 1

then i call transfer function from factory contract, then see the NewContractCreated event again but i got empty as a result: Event 2

So where did all my past event from before go, and how did it disapear?


1 Answer 1


Don't know if somebody will get into this kind of problem but the solution to my problem is when using web3js i just have to type MyContract.getPastEvent("MyEvent", {fromBlock: 0}) and it will print out for all event. Don't know how this work but it just work

  • When you use fromBlock:0, it will show all the events from the first block.
    – Uahmed
    Commented Feb 28, 2019 at 14:48

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