在部署時將 ERC20 發送到合約

我正在嘗試在合約部署上向合約本身發送一定數量的 ERC20。我正在使用 Hardhat 和 OpenZeppelin 契約。合約程式碼：

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

import "hardhat/console.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract Test {
   address private owner;
   IERC20 private _token;

   constructor(
       IERC20 token,
       uint256 tokenAmount
   ) {
       owner = msg.sender;
       _token = token;
       uint ownerBalance = _token.balanceOf(owner);
       console.log("Amount available: ", ownerBalance);
       console.log("Amount to transfer: ", tokenAmount);
       bool success = _token.approve(owner, tokenAmount);
       console.log("Is approved: ", success);
       uint allowance = _token.allowance(owner, address(this));
       console.log("Allowance: ", allowance);
       _token.transferFrom(owner, address(this), tokenAmount);
   }
}

部署腳本：

const hre = require("hardhat");
const { utils } = require("ethers");

async function main() {
 const tokenAddr = "0x2279B7A0a67DB372996a5FaB50D91eAA73d2eBe6"; // Contract address of deployed erc20
 const tokenAmount = "100";
 const Test = await hre.ethers.getContractFactory("Test");
 const test = await Test.deploy(
   tokenAddr,
   utils.parseUnits(tokenAmount, 18)
 );

 await test.deployed();

 console.log("Contract deployed to:", test.address);
}

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

部署失敗：

ProviderError: Error: VM Exception while processing transaction: reverted with reason string 'ERC20: insufficient allowance'

但是從日誌中你可以看到批准是成功的：

 console.log:
   Amount available:  10000000000000000000000
   Amount to transfer:  100000000000000000000
   Is approved:  true
   Allowance:  0

有些東西不見了。我不知道是什麼

您不能將 transferFrom 函式用於建構子。原因是此功能使用批准 + 轉移將令牌（在這種情況下）從您的帳戶轉移到智能合約。批准（）函式需要兩個欄位：

• 花費者：將花費您的代幣的人的地址；
• 金額：“花費者”可以花費多少代幣。

對於第一個參數，您必須輸入有關您的智能合約的地址，如果您沒有部署它，您將無法知道它的地址！出於這個原因（在這種情況下），您不能將 transferFrom() 呼叫到智能合約建構子中。

如果要解決此問題，可以實現一個函式，在其中呼叫 transferFrom() 函式。例如，你可以看到這個智能合約程式碼：

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

import "hardhat/console.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract Test {
   address private owner;
   IERC20 private token;

   constructor(address _tokenAddress) {
       // NOTE: You pass the address about token to send to smart contract 
       token = IERC20(_tokenAddress);
   }

   // NOTE: Remember to call before 'approve()' function and then this function
   function transferMyTokenToThisSmartContract(uint _amount) public {
       token.transferFrom(msg.sender, address(this), _amount);
   }
}

引用自：https://ethereum.stackexchange.com/questions/127619