Getting an error when trying to execute the deploy script

Question

I'm getting a Transaction reverted without a reason string when I try to execute the deploy script.

Smart Contract:

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract DecentralizedEVoting is Ownable {

    struct Candidate {
        uint256 Id;
        bytes32 Name;
        uint256 Votes;
    }

    bool hasEnded;
    mapping(address => bool) public hasVoted;
    Candidate[] public candidates;

    constructor(bytes32[] memory _candidateNames) payable {
        for(uint256 i = 0; i < _candidateNames.length; i++) {
            candidates[i] = Candidate(i, _candidateNames[i], 0);
        }
    }

    function viewCandidates() public view returns(Candidate[] memory){
        return candidates;
    }

    function vote(uint256 _ID) public {
        require(!hasEnded);
        require(!hasVoted[msg.sender], "This address has been voted before." );
        hasVoted[msg.sender] == true;
        candidates[_ID].Votes++;
    }

    function endElection() public onlyOwner {
        hasEnded = true;
    }

}

deploy.js

async function main() {

  const DecentralizedEVoting = await ethers.getContractFactory("DecentralizedEVoting");
  const decentralizedEVoting = await DecentralizedEVoting.deploy(["0x61686d6574000000000000000000000000000000000000000000000000000000", "0x6d65686d65740000000000000000000000000000000000000000000000000000"]); // [ahmet, mehmet]

  await decentralizedEVoting.deployed();

  console.log("DecentralizedEVoting contract deployed to:", decentralizedEVoting.address);
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

Getting this error when trying to run the script:

web3_clientVersion
eth_chainId
eth_accounts
eth_blockNumber
eth_chainId (2)
eth_estimateGas
  Contract deployment: <UnrecognizedContract>
  From:                0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
  Value:               0 ETH

  **Error: Transaction reverted without a reason string**
      at <UnrecognizedContract>.constructor (unknown)
      at EthModule._estimateGasAction (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/provider/modules/eth.ts:425:7)
      at HardhatNetworkProvider._sendWithLogging (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:139:22)
      at HardhatNetworkProvider.request (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:116:18)
      at JsonRpcHandler._handleRequest (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:188:20)
      at JsonRpcHandler._handleSingleRequest (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:167:17)
      at Server.JsonRpcHandler.handleHttp (/home/user/dev/decentralized-e-voting/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:52:21)

Thanks in advance, have a nice day :)

Answer 1

Instead of using:

candidates[i] = Candidate(i, _candidateNames[i], 0);

use this:

candidates.push(Candidate(i, _candidateNames[i], 0));

the reason being, you are using dynamically sized array of candidates and not fixed sized!!