令牌傳輸失敗並恢復

我在 Github https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/contracts/examples/SampleCrowdsale.sol中有您最新版本的契約和幾乎相同的範例- 我使用 Ganache 在 MAC 作業系統上進行測試. 只有當我評論該行時，契約才有效

function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal {
   //token.transfer(_beneficiary, _tokenAmount);
 }

如果未對此進行評論，我會遇到執行時錯誤並恢復。

我的簡單程式碼如下：

代幣

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/token/ERC20/MintableToken.sol';

/**
* The LeonardianToken contract does this and that...
*/
contract LeonardianToken is MintableToken {

   uint256 public constant INITIAL_SUPPLY = 10000;


   string public constant name = "Leonardian"; // solium-disable-line uppercase
   string public constant symbol = "LEON"; // solium-disable-line uppercase
   uint8 public constant decimals = 18; // solium-disable-line uppercase
}

契約：

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/crowdsale/validation/TimedCrowdsale.sol';
import "zeppelin-solidity/contracts/crowdsale/Crowdsale.sol";
import './LeonardianToken.sol';

contract LeonardianCrowdsale is Crowdsale {

   function LeonardianCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, MintableToken _token) public 
   Crowdsale(_rate, _wallet, _token)
   // TimedCrowdsale(_startTime, _endTime)
   {

   }
}

遷移（沒有任何錯誤）：

var LeonardianCrowdsale = artifacts.require("./LeonardianCrowdsale.sol");
var LeonardianToken = artifacts.require("./LeonardianToken.sol");

module.exports = function(deployer) {

 deployer.deploy(LeonardianToken).then(function () {

   const startTime = Math.round((new Date(Date.now() - 86400000).getTime())/1000); // Yesterday
   const endTime = Math.round((new Date().getTime() + (86400000 * 20))/1000); // Today + 20 days
   var exchangeRate = 1; // 1 LEON = 0.0025 ETH or 1 ETH = 400 LEON

   deployer.deploy(LeonardianCrowdsale, 
       startTime, 
       endTime,
       exchangeRate, 
       "0x627306090abaB3A6e1400e9345bC60c78a8BEf57", // Replace this wallet address with the last one (10th account) from Ganache UI. This will be treated as the beneficiary address. 
       LeonardianToken.address
     );
 });

};

你能幫我做錯什麼嗎？

解決方案

如前所述 ERC20 _token = new LeonardianToken(); 必須在 Crowdsale 契約中實例化，並且在此之後進行所有工作的重要事情是稍微更改您的遷移

return deployer
   .then(() => {
       return deployer.deploy(Token);
   })
   .then(() => {

       return deployer.deploy(
           Crowdsale,
           startTime,
           endTime,
           exchangeRate,
           "wallet",
           Token.address
       );
   })
   .then(() => {

       var token = Token.at(Token.address);

       token.transferOwnership(Crowdsale.address);
   });

令牌必須與 Crowdsale 分開部署並在 Crowdsale 中實例化

pragma solidity ^0.4.18;

import 'zeppelin-solidity/contracts/crowdsale/validation/TimedCrowdsale.sol';
import "zeppelin-solidity/contracts/crowdsale/Crowdsale.sol";
import './LeonardianToken.sol';

contract LeonardianCrowdsale is Crowdsale {

   ERC20 _token = new LeonardianToken();

   function LeonardianCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, MintableToken _token) public 
   Crowdsale(_rate, _wallet, _token)
   // TimedCrowdsale(_startTime, _endTime)
   {

   }
}

引用自：https://ethereum.stackexchange.com/questions/41737